INTERNATIONAL RECTIFIER CORP /DE/
424A, 1994-11-03
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                 Subject to Completion, dated October 28, 1994
PROSPECTUS
                                4,500,000 SHARES
                                     [LOGO]
                      INTERNATIONAL RECTIFIER CORPORATION
                                  COMMON STOCK
                                ----------------

   
    All of the 4,500,000 shares of Common Stock, par value $1.00 per share  (the
"Shares"),  offered hereby are being sold by International Rectifier Corporation
("IR" or  the "Company").  Of  the 4,500,000  shares  of Common  Stock  offered,
3,600,000  shares will be offered  initially in the United  States and Canada by
the U.S. Underwriters (the "U.S. Offering")  and 900,000 shares will be  offered
concurrently  outside the United States and Canada by the International Managers
(the  "International  Offering"  and,  together  with  the  U.S.  Offering,  the
"Offerings").  The offering price and underwriting discounts and commissions for
the U.S.  Offering  and  the  International  Offering  will  be  identical.  See
"Underwriting."
    

   
    The  Company's Common Stock is listed on the New York Stock Exchange and the
Pacific Stock Exchange under the symbol "IRF." On October 27, 1994, the  closing
price  for the Company's Common  Stock on the New  York Stock Exchange Composite
Tape was  $23.625 per  share. See  "Price  Range of  Common Stock  and  Dividend
Policy."
    
                             ---------------------

    SEE "RISK FACTORS" FOR CERTAIN MATTERS RELEVANT TO AN INVESTMENT IN THE
                            COMPANY'S COMMON STOCK.
                             ---------------------

THESE  SECURITIES  HAVE  NOT  BEEN APPROVED  OR  DISAPPROVED  BY  THE SECURITIES
    AND EXCHANGE  COMMISSION  OR ANY  STATE  SECURITIES COMMISSION  NOR  HAS
       THE    SECURITIES   AND   EXCHANGE   COMMISSION   OR   ANY   STATE
           SECURITIES  COMMISSION   PASSED  UPON   THE  ACCURACY   OR
              ADEQUACY  OF  THIS  PROSPECTUS.  ANY  REPRESENTATION
                      TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
                                                                Underwriting
                                                                 Discounts
                                               Price                and             Proceeds to
                                             to Public        Commissions (1)       Company (2)
<S>                                      <C>                 <C>                 <C>
Per Share..............................  $                   $                   $
Total (3)..............................  $                   $                   $
<FN>
(1)  The  Company  has  agreed  to  indemnify  the  U.S.  Underwriters  and  the
     International  Managers against certain  liabilities, including liabilities
     under the Securities Act of 1933, as amended. See "Underwriting."
(2)  Before deducting estimated expenses of the Offerings of $           payable
     by the Company.
(3)  The  Company  has  granted  the  U.S.  Underwriters  and  the International
     Managers a 30-day  option to purchase  up to 675,000  additional shares  of
     Common  Stock on the same terms and conditions as set forth above solely to
     cover over-allotments, if  any. If such  option is exercised  in full,  the
     total  Price to Public, Underwriting Discounts and Commissions and Proceeds
     to Company will be $          , $           and $          ,  respectively.
     See "Underwriting."
</TABLE>

                             ---------------------

   
    The  shares of Common  Stock offered by  this Prospectus are  offered by the
U.S.  Underwriters  subject  to  prior  sale,  to  withdrawal,  cancellation  or
modification  of the offer without notice, to  delivery to and acceptance by the
U.S. Underwriters  and  to  certain  further conditions.  It  is  expected  that
delivery  of the Shares will be made at the offices of Lehman Brothers Inc., New
York, New York, on or about            , 1994.
    
                             ---------------------
LEHMAN BROTHERS

             KIDDER, PEABODY & CO.
                          Incorporated

                           MONTGOMERY SECURITIES

                                        PAINEWEBBER INCORPORATED

                                                               SMITH BARNEY INC.

              , 1994
<PAGE>
                           [INSIDE FRONT COVER PHOTO]

[PHOTO1]
   
Schematic illustration  of generic  automobile showing  color-coded  application
points for International Rectifier components.
    

[CAPTION]
   
In  recent model years the proliferation of safety and comfort features that use
electronic components  has  made  automobiles  the  fastest-growing  market  for
International Rectifier products.
    

    IN   CONNECTION  WITH   THE  OFFERINGS,   THE  U.S.   UNDERWRITERS  AND  THE
INTERNATIONAL MANAGERS MAY OVER-ALLOT OR EFFECT TRANSACTIONS WHICH STABILIZE  OR
MAINTAIN  THE MARKET PRICE OF  THE COMPANY'S COMMON STOCK  AT A LEVEL ABOVE THAT
WHICH MIGHT  OTHERWISE PREVAIL  IN THE  OPEN MARKET.  SUCH TRANSACTIONS  MAY  BE
EFFECTED  ON  THE NEW  YORK STOCK  EXCHANGE OR  OTHERWISE. SUCH  STABILIZING, IF
COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

                                       2
<PAGE>
                               PROSPECTUS SUMMARY

    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION AND FINANCIAL  STATEMENTS AND NOTES  THERETO APPEARING ELSEWHERE  OR
INCORPORATED  BY REFERENCE IN  THIS PROSPECTUS. UNLESS  OTHERWISE INDICATED, ALL
INFORMATION IN THE PROSPECTUS ASSUMES NO EXERCISE OF THE U.S. UNDERWRITERS'  AND
INTERNATIONAL   MANAGERS'  OVER-ALLOTMENT   OPTION  (SEE   "UNDERWRITING").  THE
COMPANY'S FISCAL YEAR  END IS  JUNE 30  (SEE "NOTE  1 --  NOTES TO  CONSOLIDATED
FINANCIAL STATEMENTS").

                                  THE COMPANY

    International  Rectifier  Corporation ("IR"  or  the "Company")  is  a major
worldwide  supplier  of  power  semiconductors,  which  convert  electricity  in
products  using electrical  current. The  Company's trademarked  HEXFET-R- power
MOSFETs (Metal Oxide Semiconductor  Field Effect Transistors), IGBTs  (Insulated
Gate  Bipolar  Transistors),  rectifiers  and thyristors  enable  IR  to provide
customers with integrated solutions to their power conversion needs.

   
    According to statistics published by the Semiconductor Industry  Association
("SIA")  for  calendar 1993,  the Company  had a  17% market  share of  the $1.1
billion power MOS transistor segment, comprised  of power MOSFETs and IGBTs.  In
addition,  the Company sold approximately $19.1 million of power MOSFET and IGBT
chips and wafers  to third parties  in calendar 1993.  Accordingly, the  Company
believes  it  is the  world leader  in  the power  MOS transistor  market. Power
MOSFETs, IGBTs,  chips and  wafers comprised  over two-thirds  of the  Company's
fiscal  1994 sales.  SIA data  indicates that  industry-wide sales  of power MOS
transistors in calendar 1993 increased 23% over 1992 levels, and that, over  the
past  five years, power  MOSFET and IGBT  sales have grown  at an average annual
rate of 26%.
    

    Applications for the Company's products include:

    AUTOMOBILES: anti-lock braking systems, fuel injection systems, air bags and
power accessories;
    COMMUNICATIONS EQUIPMENT: telephone networks, satellites and modems;
    COMPUTERS AND PERIPHERALS: power supplies and disk drives in desktop,
mainframe and portable computers and printers;
    CONSUMER ELECTRONICS AND LIGHTING: fluorescent lighting ballasts, home
entertainment equipment and household appliances;
    INDUSTRIAL EQUIPMENT: motor-driven production lines, instrumentation and
test equipment, machine tools, fork lifts and welders; and
    OFFICE EQUIPMENT: copiers and facsimile machines.

    The Company has operated internationally for 35 years. In fiscal 1994,  over
50%  of the  Company's sales  were to  foreign customers,  divided almost evenly
between Europe and Asia, and the  remainder were to customers in North  America.
The   Company's  customers  include   global  industry  leaders   such  as  AT&T
Technologies Inc., Conner Peripherals, Inc., General Motors Corporation, Hewlett
Packard Co., International Business Machines Corp., Matsushita Electric Industry
Company, Ltd., Sanken Electric Company, Ltd., Siemens AG and Sony Corporation.

    To meet rising demand  for power MOS transistors,  the Company is  expanding
its  wafer fabrication  capacity at  HEXFET America,  its power  MOSFET plant in
Temecula, California.  The  estimated $75.0  million  expansion, which  will  be
funded  in part with the  proceeds of the Offerings,  should be completed by the
end of calendar 1995. The expansion  is estimated ultimately to increase  HEXFET
America's  wafer fabrication  capacity by about  75%. See "Use  of Proceeds" and
"Business -- Manufacturing."

    At September 30,  1994, the Company  had an order  backlog of  approximately
$132.5  million as compared  to $85.6 million  at September 30,  1993 and $121.8
million at June 30, 1994.

    Reference is made to  the Glossary for the  definition of certain  technical
terms used in this Prospectus.

                                       3
<PAGE>
                                 THE OFFERINGS

   
<TABLE>
<S>                                                              <C>
Common Stock offered by the Company.............................. 4,500,000 shares
Common Stock outstanding after the Offerings..................... 24,892,323(1)
New York Stock Exchange Symbol................................... IRF
Use of Proceeds.................................................. To  expand the Company's wafer fabrication capacity at its HEXFET
                                                                 America facility, repay debt  and for general corporate  purposes
                                                                 including working capital.
<FN>
- ------------------------
(1)  Based  on 20,392,323 shares outstanding on September 30, 1994 and excluding
     an  aggregate  of  268,320  shares   issuable  upon  exercise  of   options
     outstanding on September 30, 1994 under the Company's stock option plans.
</TABLE>
    

                         SUMMARY FINANCIAL INFORMATION

<TABLE>
<CAPTION>
                                  THREE MONTHS
                                ENDED SEPTEMBER
                                30, (UNAUDITED)   FISCAL YEARS ENDED JUNE 30,
                                ----------------  ----------------------------
                                 1994     1993      1994      1993      1992
                                -------  -------  --------  --------  --------
                                   (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
<S>                             <C>      <C>      <C>       <C>       <C>
OPERATING RESULTS
Revenues......................  $92,253  $73,094  $328,882  $281,732  $265,495
Gross profit..................   31,514   23,420   108,938    79,048    79,058
Operating profit..............    8,917    3,260    23,549     2,328    10,882
Interest expense, net.........     (912)    (760)   (3,625)   (2,250)   (1,436)
Income (loss) before income
 taxes........................    7,826    2,306    18,874    (2,597)   10,512
Net income (loss).............    6,498    1,976    15,714    (3,033)    9,237
Net income (loss) per share...  $  0.32  $  0.10  $   0.78  $  (0.15) $   0.46
Average common and common
 equivalent shares
 outstanding..................   20,596   20,360    20,428    20,087    20,107
</TABLE>

<TABLE>
<CAPTION>
                                                      SEPTEMBER 30, 1994
                                                         (UNAUDITED)
                                                    ----------------------
                                                     ACTUAL   ADJUSTED (1)
                                                    --------  ------------
<S>                                                 <C>       <C>
                                                        (IN THOUSANDS)
BALANCE SHEET
Working capital...................................  $ 66,888    $167,901
Total assets......................................   348,489     432,602
Short-term debt...................................    41,467      24,567
Long-term debt, less current maturities...........    28,605      28,605
Stockholders' equity..............................   210,303     311,316
<FN>
- ------------------------
(1)  Adjusted to reflect the sale of 4,500,000 shares by the Company pursuant to
     the Offerings, and the application of the net proceeds.
</TABLE>

                                       4
<PAGE>
                                  THE COMPANY

    IR  is  a major  worldwide supplier  of  power semiconductors  which convert
electricity at relatively high  voltage and current levels  in products such  as
automobiles,  communications  equipment,  computers  and  peripherals,  consumer
electronics and lighting, industrial equipment and office equipment. The process
of power conversion can be viewed in four stages: input rectification,  control,
switching  and  output  rectification. Input  rectification  conditions off-line
electricity, typically  rectifying alternating  current to  direct current.  The
control  function measures incoming electricity and  sends a signal to a switch.
The switch  packages  the  current into  discrete  units.  Output  rectification
reconfigures   the  elements  into  a  form  useable  by  electrically  operated
equipment. IR supplies products that perform each of these four basic functions.

    IR was founded  as a California  corporation in 1947  and reincorporated  in
Delaware  in 1979. Its  executive offices are  located at 233  Kansas Street, El
Segundo, California 90245 and its telephone number is (310) 322-3331.

                                  RISK FACTORS

    Prospective investors  should carefully  consider the  following factors  in
addition  to  the other  information provided  elsewhere  in this  Prospectus or
incorporated by reference herein  in evaluating an  investment in the  Company's
Common Stock.

EXPANSION RISKS

    The  Company is expanding wafer fabrication  capacity at HEXFET America, its
power MOSFET plant  in Temecula, California.  Although the Company  has not  yet
experienced,  and does  not anticipate, any  delays in  construction or existing
production at HEXFET America,  there can be no  assurance that the Company  will
not  experience  such delays  or other  delays  in ramping  up production  or in
changing process technologies. See "Business -- Manufacturing."

MANUFACTURING RISKS

    The Company's manufacturing processes  are highly complex, require  advanced
and costly equipment and are continuously being modified in an effort to improve
yields  and product performance. Minute impurities  or other difficulties in the
manufacturing process can lower yields. In the past, the Company has experienced
assembly output  limitations  that  have  constrained sales.  There  can  be  no
assurance that the Company will not experience manufacturing difficulties in the
future.  In  addition,  although  HEXFET America  is  designed  to  resist large
magnitude earthquakes  and other  natural  disasters, the  Company's  operations
would  be  materially adversely  affected if  production  at this  facility were
interrupted. See "Business -- Manufacturing."

CONCENTRATION OF SUPPLIERS AND ASSEMBLERS

    Although the  Company  generally uses  materials  and parts  available  from
multiple  suppliers,  the Company  has only  a limited  number of  suppliers for
certain materials and  parts. The  Company has not  experienced any  substantial
production  delays from  materials or parts  shortages in the  past. The Company
believes that alternate suppliers for  these materials and parts are  available,
but  there can be no assurance that the Company will not experience interruption
of such supplies in the future.

    During IR's recent expansion program at HEXFET America, a subcontractor that
provided  assembly  for  up  to   30%  of  IR's  fastest-growing  product   line
discontinued   this  kind   of  production,  resulting   in  product  shortages.
Approximately 25% of the Company's power MOSFETs are currently assembled by  two
subcontractors in Southeast Asia. The Company believes that these subcontractors
and  alternative  assembly  subcontractors provide  adequate  assembly capacity.
Interruptions in assembly could, however, have a material adverse impact on  the
Company's  operations.  There can  be  no assurance  that  the Company  will not
experience  interruption  of  such  assembly  operations  in  the  future.   See
"Management's  Discussion  and Analysis  of Financial  Condition and  Results of
Operations."

SIGNIFICANT INTERNATIONAL OPERATIONS

    Over 50%  of the  Company's  revenues were  derived  from sales  in  foreign
markets  in fiscal  1994. The Company  expects revenues from  foreign markets to
continue to represent a significant portion of total revenues. The Company  owns
and  uses subcontract manufacturing  and assembly facilities  in England, Italy,

                                       5
<PAGE>
Mexico, Japan and the Philippines, among others, and sells products manufactured
domestically to foreign customers. The Company's foreign operations are  subject
to  the  usual  risks  that  may  affect  such  operations,  including  currency
fluctuations,  difficulty  collecting  receivables  and  possible   governmental
actions, tariffs, taxes, future import and export restrictions and political and
governmental changes.

TECHNOLOGICAL CHANGE

    The  power  semiconductor  market  is subject  to  technological  change and
evolving industry standards. To remain competitive, the Company must continue to
devote  significant  resources  to   advance  process  technologies  to   reduce
semiconductor  die size, increase product  performance and improve manufacturing
yields. There  can be  no  assurance that  the  Company's competitors  will  not
develop  new technologies that  are substantially equivalent  or superior to the
Company's patented  technology or  that the  Company will  be able  to  continue
enhancing  existing processes or  developing new technologies.  See "Business --
Research and Development," and "-- Competition."

PROTECTION OF INTELLECTUAL PROPERTY

    The Company relies on its patents and technological know-how to protect  its
market  position.  See  "Business --  Intellectual  Property." There  can  be no
assurance that the  Company will be  able to protect  its intellectual  property
rights  effectively.  In  addition,  protection  of  the  Company's intellectual
property rights in foreign markets is  not as strong as the protection  afforded
to  its  intellectual property  in the  United  States. From  time to  time, the
Company and certain companies  have asserted patent  rights against each  other.
The  Company is presently engaged in such litigation, involving power MOSFET and
IGBT patents, with one of  its competitors. There can  be no assurance that  the
Company  will  be successful  with respect  to  litigation or  other proceedings
involving patent rights or that such litigation might not increase the Company's
costs of doing business, expose the  Company to substantial monetary damages  or
interfere  with the sale  of its products.  The Company has  incurred, and could
incur in the future, substantial  costs protecting its intellectual property  or
defending infringement claims. See "Business -- Legal Proceedings."

SECURITIES LAWS LITIGATION

    The  Company,  its  directors  and  certain  officers  have  been  named  as
defendants in three  class action  lawsuits in California  which allege  certain
intentional  and  negligent  misrepresentations and  violations  of  the federal
securities laws in connection with the Company's public offering of common stock
in April 1991 and the  redemption in June 1991  of the Company's 9%  Convertible
Subordinated Debentures and certain other matters. Although the Company believes
that  the allegations in these lawsuits  are without merit, the ultimate outcome
cannot be presently  determined, and  a substantial judgment  or settlement,  if
any,  could have a material adverse  effect on the Company's financial condition
and results of operations. See "Business -- Legal Proceedings."

COMPETITION

    The Company competes with a number of different manufacturers in each of its
major  product  areas.  Many  of  these  companies  have  substantially  greater
financial,  technical, manufacturing  and marketing resources  than the Company.
IR's ability to compete depends upon a number of factors, including new  product
and process technologies introduced by the Company and its competitors, customer
acceptance  of the Company's products, cost-effective manufacturing, enforcement
of intellectual property rights and general market and economic conditions. Some
of these factors are  out of the  Company's control. There  can be no  assurance
that  the Company  will be  able to compete  successfully in  the future against
existing or potential competitors. See "Business -- Competition."

CHANGE OF CONTROL PROVISIONS

    The Company's  Certificate of  Incorporation and  Bylaws contain  provisions
that  make it more difficult for a third  party to acquire, or that discourage a
third party from attempting to acquire, control of the Company. In addition,  as
a Delaware corporation, the Company is subject to the restrictions imposed under
Section  203 of the  Delaware General Corporation Law  which prevent the Company
from engaging in  certain change  of control  transactions with  certain of  its
stockholders under certain circumstances. See "Description of Capital Stock."

                                       6
<PAGE>
STOCK PRICE VOLATILITY

    The  Company's  Common Stock  has  experienced substantial  price volatility
which  also   may  occur   in  the   future,  particularly   as  a   result   of
quarter-to-quarter  variations in the actual or anticipated financial results of
the Company or other companies in  the semiconductor industry or in the  markets
served  by  the Company,  or  announcements by  the  Company or  its competitors
regarding  new  product  introductions.  In  addition,  the  stock  market   has
experienced  extreme price and volume fluctuations that have affected the market
price of many  technology companies' stocks  in particular and  that have  often
been  unrelated to the  operating performance of  these companies. These factors
may adversely affect the market price of  the Common Stock. See "Price Range  of
Common Stock."

                                       7
<PAGE>
                                USE OF PROCEEDS

    The  net proceeds to  the Company from  the sale of  the 4,500,000 shares of
Common Stock offered  hereby are  estimated to be  approximately $101.0  million
($116.2  million  if the  Underwriters'  over-allotment option  is  exercised in
full). The  Company  anticipates spending  approximately  $70.1 million  of  the
proceeds  to  expand  its  wafer fabrication  capacity  at  HEXFET  America. See
"Business -- Manufacturing." Approximately $9.9 million of the proceeds will  be
used  to repay amounts outstanding under the Company's domestic revolving credit
facility and approximately $7.0  million of the proceeds  will be used to  repay
amounts  outstanding  under  short-term  foreign  loans.  The  interest  rate on
domestic borrowings to be  repaid is either  LIBOR plus 1.25%  or prime and  the
weighted  average rate on foreign debt that will be repaid was 7.9% at September
30, 1994. The remainder  of the proceeds  will be used  for working capital  and
general corporate purposes. Notwithstanding the debt repayments, the Company may
reborrow  in the  future to support  potential expansion  and growth activities.
Pending application of  the funds,  the net  proceeds may  be used  to pay  down
additional  short-term  debt  obligations  and may  be  invested  in short-term,
interest-bearing obligations.

                                 CAPITALIZATION

    The following table sets forth the unaudited consolidated capitalization  of
the  Company at September 30, 1994, and as  adjusted for the sale by the Company
of the 4,500,000 shares of Common  Stock offered hereby, and the application  of
the net proceeds therefrom as described under "Use of Proceeds."

<TABLE>
<CAPTION>
                                                                                              SEPTEMBER 30, 1994
                                                                                            ----------------------
                                                                                                            AS
                                                                                              ACTUAL     ADJUSTED
                                                                                            ----------  ----------
                                                                                                (IN THOUSANDS)
<S>                                                                                         <C>         <C>
Short-term debt:
  Bank loans..............................................................................  $   34,853  $   17,953
  Long-term debt -- due within one year, including current maturities.....................       6,614       6,614
                                                                                            ----------  ----------
                                                                                            $   41,467  $   24,567
                                                                                            ----------  ----------
                                                                                            ----------  ----------
Long-term debt, less current maturities:
  Capitalized lease obligations payable in varying monthly installments primarily at rates
   from 6.9% to 16.6%.....................................................................  $   11,747  $   11,747
  10.55% property mortgage due in equal monthly installments to 2011......................       4,170       4,170
  Domestic bank loans collateralized by equipment, payable in varying monthly installments
   at rates from 7.1% to 9.0%, due in 1995 through 1999...................................       4,834       4,834
  Foreign bank loans collateralized by property and/or equipment, payable in varying
   monthly installments at rates from 6.5% to 10.8%, due in 1997 through 2000.............       3,787       3,787
  Foreign unsecured bank loans payable in varying monthly installments at rates from 4.0%
   to 11.9%, due in 1998 through 2006.....................................................       4,067       4,067
                                                                                            ----------  ----------
                                                                                                28,605      28,605
                                                                                            ----------  ----------
Stockholders' equity:
  Common shares, $1.00 par value, 30,000,000 shares authorized, 20,392,323 shares issued
   and outstanding (24,892,323 shares as adjusted)(1).....................................      20,392      24,892
  Capital contributed in excess of par value of shares....................................     168,508     265,021
  Retained earnings.......................................................................      25,998      25,998
  Cumulative translation adjustments......................................................      (4,595)     (4,595)
                                                                                            ----------  ----------
    Total stockholders' equity............................................................     210,303     311,316
                                                                                            ----------  ----------
    Total capitalization..................................................................  $  238,908  $  339,921
                                                                                            ----------  ----------
                                                                                            ----------  ----------
<FN>
- ------------------------
(1)  Excludes  268,320 shares issuable upon exercise  of options pursuant to the
     Company's stock option plans as of September 30, 1994.
</TABLE>

                                       8
<PAGE>
                          PRICE RANGE OF COMMON STOCK

    The Company's Common Stock is traded on the New York Stock Exchange and  the
Pacific  Stock Exchange under  the symbol "IRF." The  following table sets forth
the range of high  and low closing prices  of the Common Stock  on the New  York
Stock Exchange Composite Tape for the periods presented.

<TABLE>
<CAPTION>
                                                            PRICE RANGE
                                                       ----------------------
FISCAL YEAR                                              HIGH          LOW
- --------------------------------------------------     --------      --------
<S>                                                    <C>           <C>
1993
  First Quarter...................................     $ 10          $  8
  Second Quarter..................................       13             8 7/8
  Third Quarter...................................       13 1/2        11
  Fourth Quarter..................................       12 5/8        10
1994
  First Quarter...................................       13 1/8        10 1/4
  Second Quarter..................................       14 7/8        10 1/4
  Third Quarter...................................       19            13 7/8
  Fourth Quarter..................................       17 1/8        13 1/2
1995
  First Quarter...................................       22 1/4        15 1/8
  Second Quarter (through October 27).............       24            19 1/4
</TABLE>

    The  closing price of the  Company's Common Stock is  set forth on the cover
page of this Prospectus. On October 20, 1994, the Company had 1,759 stockholders
of record.

                                DIVIDEND POLICY

    No dividends have been declared or  paid since October 1, 1981. The  Company
does  not intend to  pay cash dividends  in the foreseeable  future as all funds
will  be  reinvested  in  its  operations.  Furthermore,  under  certain  credit
agreements, the Company is not permitted to pay any cash dividends.

                                       9
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    The  selected consolidated financial data  as of June 30,  1994 and 1993 and
for the fiscal years  ended June 30,  1994, 1993 and 1992  are derived from  the
audited  consolidated financial statements of the  Company and should be read in
conjunction with the  audited consolidated financial  statements and notes  with
respect  thereto included herein. The selected consolidated financial data as of
June 30, 1992, 1991 and 1990, and for  the fiscal years ended June 30, 1991  and
1990  are derived from audited consolidated  financial statements of the Company
which are not included  herein. Information at September  30, 1994 and 1993  and
for  the three month periods ended September  30, 1994 and 1993 is unaudited but
reflects all material adjustments  (consisting of normal recurring  adjustments)
which  in  the Company's  opinion are  necessary to  present the  information in
accordance with generally accepted accounting principles. The operating  results
for  the  three  month  period  ended September  30,  1994  are  not necessarily
indicative of the operating results for the full fiscal year.
<TABLE>
<CAPTION>
                                            THREE MONTHS ENDED
                                              SEPTEMBER 30,                   FISCAL YEARS ENDED JUNE 30,
                                           --------------------  -----------------------------------------------------
                                             1994       1993       1994       1993       1992       1991       1990
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                        <C>        <C>        <C>        <C>        <C>        <C>        <C>
STATEMENT OF OPERATIONS DATA(1)
Revenues.................................  $  92,253  $  73,094  $ 328,882  $ 281,732  $ 265,495  $ 252,800  $ 229,863
Cost of sales............................     60,739     49,674    219,944    202,684    186,437    167,044    162,075
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Gross profit.............................     31,514     23,420    108,938     79,048     79,058     85,756     67,788
Selling and administrative expense.......     18,486     16,350     69,008     62,637     58,771     51,544     41,526
Research and development expense.........      4,111      3,810     16,381     14,083      9,405      7,538      6,585
Restructuring charge.....................         --         --         --         --         --      1,000         --
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Operating profit.........................      8,917      3,260     23,549      2,328     10,882     25,674     19,677
Interest expense, net....................       (912)      (760)    (3,625)    (2,250)    (1,436)   (13,266)   (17,062)
Other income (expense)...................       (179)      (194)    (1,050)    (2,675)     1,066      5,825          8
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before income taxes and
 extraordinary item......................      7,826      2,306     18,874     (2,597)    10,512     18,233      2,623
Provision for income taxes...............      1,328        330      3,160        436      1,275      1,086        466
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Income (loss) before extraordinary
 item....................................      6,498      1,976     15,714     (3,033)     9,237     17,147      2,157
Extraordinary item, net..................         --         --         --         --         --        726         --
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Net income (loss)........................  $   6,498  $   1,976  $  15,714  $  (3,033) $   9,237  $  16,421  $   2,157
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
INCOME (LOSS) PER SHARE:
  Before extraordinary item..............  $    0.32  $    0.10  $    0.78  $   (0.15) $    0.46  $    1.30  $    0.18
  Extraordinary item.....................         --         --         --         --         --      (0.06)        --
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Net income (loss) per share............  $    0.32  $    0.10  $    0.78  $   (0.15) $    0.46  $    1.24  $    0.18
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
Average common and common equivalent
 shares outstanding......................     20,596     20,360     20,428     20,087     20,107     13,210     11,733
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------

<CAPTION>

                                             AT SEPTEMBER 30,                         AT JUNE 30,
                                           --------------------  -----------------------------------------------------
                                             1994       1993       1994       1993       1992       1991       1990
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                         (IN THOUSANDS)
<S>                                        <C>        <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA
Working capital..........................  $  66,888  $  61,319  $  67,165  $  58,116  $  67,538  $  74,900  $  25,889
Total assets.............................    348,489    287,461    330,574    278,448    285,880    250,263    217,532
Short-term debt..........................     41,467     29,852     33,310     27,539     27,135     15,821     27,309
Long-term debt, less current
 maturities..............................     28,605     14,158     26,817     11,810     11,535     11,921    120,139
Stockholders' equity.....................    210,303    188,295    202,943    186,074    191,703    179,535     21,572
<FN>
- ------------------------------
(1)  Certain reclassifications have been made to previously reported amounts  to
     conform with current year presentation.
</TABLE>

                                       10
<PAGE>
QUARTERLY RESULTS OF OPERATIONS

    The  following table  presents certain  unaudited quarterly  information for
each of the Company's  last nine quarters. Quarterly  results of operations  are
not necessarily indicative of the results expected for the full year period. For
a  discussion  of  seasonality,  see "Management's  Discussion  and  Analysis of
Financial Condition and Operations -- Seasonality."

<TABLE>
<CAPTION>
                                                                  THREE MONTHS ENDED
                   -----------------------------------------------------------------------------------------------------------------
                   SEPTEMBER 30,  JUNE 30,  MARCH 31,  DECEMBER 31,  SEPTEMBER 30,  JUNE 30,  MARCH 31,  DECEMBER 31,  SEPTEMBER 30,
                       1994         1994      1994         1993          1993         1993      1993         1992          1992
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                <C>            <C>       <C>        <C>           <C>            <C>       <C>        <C>           <C>
Revenues..........    $92,253     $92,432    $84,252     $79,104        $73,094     $75,728    $70,572     $70,452        $64,980
Cost of sales.....     60,739      60,637     56,142      53,491         49,674      53,547     50,059      51,035         48,043
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
  Gross profit....     31,514      31,795     28,110      25,613         23,420      22,181     20,513      19,417         16,937
Selling and
 administrative
 expense..........     18,486      18,402     17,465      16,791         16,350      16,182     15,827      15,502         15,126
Research and
 development
 expense..........      4,111       4,401      4,201       3,969          3,810       3,929      3,606       3,593          2,955
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
  Operating profit
   (loss).........      8,917       8,992      6,444       4,853          3,260       2,070      1,080         322         (1,144)
Other income
 (expense)
  Interest --
   net............       (912)       (910)    (1,161)       (794)          (760)       (698)      (574)       (445)          (533)
  Other -- net....       (179)       (341)      (218)       (297)          (194)       (432)      (180)     (1,674)          (389)
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
Income (loss)
 before income
 taxes............      7,826       7,741      5,065       3,762          2,306         940        326      (1,797)        (2,066)
Provision for
 income taxes.....      1,328       1,279        859         692            330         227        201         196           (188)
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
Net income
 (loss)...........    $ 6,498     $ 6,462    $ 4,206     $ 3,070        $ 1,976     $   713    $   125     $(1,993)       $(1,878)
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
Net income (loss)
 per share........    $  0.32     $  0.32    $  0.21     $  0.15        $  0.10     $  0.04    $  0.01     $ (0.10)       $ (0.09)
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
Average common and
 common equivalent
 shares
 outstanding......     20,596      20,476     20,477      20,398         20,360      20,315     20,299      19,982         19,968
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
                   -------------  --------  ---------  ------------  -------------  --------  ---------  ------------  -------------
</TABLE>

                                       11
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

RESULTS OF OPERATIONS

    The   following  table  sets  forth   certain  items  included  in  selected
consolidated financial data as a percentage of revenues.

<TABLE>
<CAPTION>
                                 THREE MONTHS ENDED
                                   SEPTEMBER 30,
                                    (UNAUDITED)         FISCAL YEARS ENDED JUNE 30,
                                 ------------------    -----------------------------
                                  1994       1993       1994       1993       1992
                                 -------    -------    -------    -------    -------
<S>                              <C>        <C>        <C>        <C>        <C>
Revenues......................     100.0%     100.0%     100.0%    100.0%     100.0 %
Cost of sales.................      65.8       68.0       66.9       71.9       70.2
                                 -------    -------    -------    -------    -------
Gross profit..................      34.2       32.0       33.1       28.1       29.8
Selling and administrative
 expense......................      20.1       22.3       21.0       22.2       22.1
Research and development
 expense......................       4.5        5.2        5.0        5.0        3.5
                                 -------    -------    -------    -------    -------
Operating profit..............       9.6        4.5        7.1        0.9        4.2
Interest expense, net.........      (1.0)      (1.0)      (1.1)      (0.8)      (0.6)
Other income (expense)........      (0.2)      (0.3)      (0.3)      (1.0)       0.4
                                 -------    -------    -------    -------    -------
Income (loss) before income
 taxes........................       8.4        3.2        5.7       (0.9)       4.0
Provision for income taxes....       1.4        0.5        0.9        0.2        0.5
                                 -------    -------    -------    -------    -------
Net income (loss).............       7.0%       2.7%       4.8%      (1.1)%      3.5%
                                 -------    -------    -------    -------    -------
                                 -------    -------    -------    -------    -------
</TABLE>

    THREE MONTHS ENDED SEPTEMBER 30, 1994 COMPARED WITH THE THREE MONTHS ENDED
SEPTEMBER 30, 1993

    Revenues for the three  months ended September 30,  1994 increased 26.2%  to
$92.3 million from $73.1 million in the prior year period. The Company's revenue
increase  reflected rising  demand for the  Company's power  MOSFETs and related
devices, which  resulted in  a 29%  increase in  revenues from  these  products.
Revenues  from the  thyristor and  rectifier product  lines increased  20% which
reflected unseasonally  strong demand  in Europe.  Changes in  foreign  exchange
rates  positively impacted revenues  by approximately $1.0  million. Revenues in
the current quarter included  $2.2 million of net  patent royalties compared  to
$2.4 million in the prior year period.

    Gross  profit for  the three  months ended September  30, 1994  was 34.2% of
revenues ($31.5 million) versus 32.0% of  revenues ($23.4 million) in the  prior
year  period. The  increased margin  reflected greater  manufacturing volume and
efficiencies in both the Company's growth and mature products.

    In the three  months ended  September 30, 1994,  selling and  administrative
expense  was 20.1% of  revenues ($18.5 million) versus  22.3% of revenues ($16.4
million) in  the  prior  year  period. The  decreased  percentage  reflects  the
Company's continued commitment to reducing operating expenses as a percentage of
revenues.

    In  the three  months ended September  30, 1994, the  Company's research and
development expenditures  increased  $0.3  million  to  $4.1  million  (4.5%  of
revenues)  from $3.8 million  (5.2% of revenues)  in the prior  year period. The
Company's research and development program was, and continues to be, focused  on
the advancement and diversification of the HEXFET product line, the expansion of
the  related IGBT products and the development of Control ICs and power products
that work in combination with HEXFETs and IGBTs to improve system performance.

    FISCAL YEAR 1994 COMPARED WITH FISCAL YEAR 1993

    The Company operates  on a  fiscal calendar  under which  the twelve  months
ended  July 3,  1994 consisted of  52 weeks compared  to 53 weeks  in the twelve
months ended July 4, 1993.

                                       12
<PAGE>
    Revenues for  fiscal 1994  increased  16.7% to  $328.9 million  from  $281.7
million  in the prior  year. The Company's  revenue increase reflected continued
growing demand  for  the  Company's  power MOSFETs  and  related  devices  which
resulted  in a 23.4%  increase in revenues from  these products. Offsetting this
revenue increase was a  6.2% decrease in revenues  from the Company's  thyristor
and  rectifier product lines. This downturn reflected slow starting economies in
key European markets in the first  half, and the planned consolidation of  these
mature  product  lines. Changes  in foreign  exchange rates  negatively impacted
revenues by approximately $2.0 million.  Revenues for fiscal 1994 also  included
$9.0  million of  net patent  royalties compared  to $9.5  million in  the prior
period.

    Gross profit was 33.1%  of revenues ($108.9 million)  in fiscal 1994  versus
28.1% of revenues ($79.0 million) in fiscal 1993. The increased margin reflected
IR's  recovery from production constraints in  fiscal 1993. In addition, greater
MOSFET manufacturing volume and efficiencies resulted in lower per unit  product
costs and enabled the Company to balance output to market demand and return to a
normal  mix of original equipment  manufacturers, distribution and higher margin
spot market business.

    In the fourth quarter of fiscal  1993 the Company extended the useful  lives
of certain assets. This change positively impacted gross profit by approximately
$2.6 million (0.8% of revenues) during fiscal 1994.

    In  fiscal 1994,  selling and administrative  expense was  21.0% of revenues
($69.0 million) versus  22.2% of revenues  ($62.6 million) in  fiscal 1993.  The
decreased  percentage reflects  the Company's  continued commitment  to reducing
operating expenses as a percentage of revenues.

    In  fiscal  1994,  the  Company's  research  and  development   expenditures
increased  $2.3 million to  $16.4 million (5.0% of  revenues) from $14.1 million
(5.0% of revenues) in the prior  period. The Company's research and  development
program was focused on the advancement and diversification of the HEXFET product
line,  the expansion of the related IGBT products and the development of Control
ICs and  power products  that work  in  combination with  HEXFETs and  IGBTs  to
improve  system performance. Included in  1994 research and development expenses
are the costs associated with efforts started in Japan in fiscal 1994 to  reduce
assembly costs and to develop new assembly processes.

    The  major components of other expense include a $0.9 million charge for the
consolidation of  the  Company's  power products  operations,  $0.4  million  of
severance  costs  and  $0.3  million  on the  disposal  of  property,  plant and
equipment, offset by $0.4 million in foreign currency transaction gains.

    FISCAL YEAR 1993 COMPARED WITH FISCAL YEAR 1992

    The Company operates on a fiscal calendar year under which the twelve months
ended July 4,  1993 consisted of  53 weeks compared  to 52 weeks  in the  twelve
months ended June 28, 1992.

    Revenues  for  fiscal  1993 increased  6.1%  to $281.7  million  from $265.5
million in the prior year. The Company's revenue increase was primarily a result
of higher sales of the Company's  power MOSFET devices and increased net  patent
royalties.  Changes in  foreign exchange  rates negatively  impacted revenues by
approximately $2.5 million. Revenues for  fiscal 1993 also include $9.5  million
of net patent royalties compared to $5.7 million in the prior period.

    During fiscal 1992 and the first three fiscal quarters of 1993, sales of the
Company's  power  MOSFET devices  were  constrained because  of  assembly output
limitations. In the second half of fiscal  1992, the Company began a program  to
expand  assembly  capacity  for power  MOSFETs  at HEXFET  America.  During this
expansion program a subcontractor that provided  assembly for up to 30% of  IR's
fastest-growing  product line  discontinued this  kind of  production. Delays in
receiving and ramping up equipment at HEXFET America were compounded by the need
to replace  the  subcontractor.  Product shortages  curtailed  IR's  growth  and
negatively affected its share of the power MOSFET market.

    Gross  profit was  28.1% of revenues  ($79.0 million) in  fiscal 1993 versus
29.8% of  revenues  ($79.1  million)  in fiscal  1992.  Margins  reflected  less
efficient  operation  during the  above assembly  expansion ramp-up  and product
allocation  that  favored   industry-leading  original  equipment   manufacturer
customers  over higher-margin spot  market business. Gross  profit for the first
half of fiscal 1993 was 26.8% of  revenues as compared to 29.2% of revenues  for
the  last half of fiscal  1993. First-half margins also  reflected a decrease in
wafer fabrication  rates  to  accommodate  a  lower  assembly  production  rate.
Second-half  margins reflected greater manufacturing volume and efficiencies and
an increase in net patent royalties.

                                       13
<PAGE>
    In fiscal 1993, selling and administrative expense increased $3.8 million to
$62.6 million (22.2% of revenues) from $58.8 million (22.1% of revenues) in  the
prior  period. These  increases reflect  planned revenue  increases, as  well as
increases associated with an  additional week of  operations reported in  fiscal
1993.

    In   fiscal  1993,  the  Company's  research  and  development  expenditures
increased $4.7 million  to $14.1 million  (5.0% of revenues)  from $9.4  million
(3.5%  of revenues) in the prior  period. The Company's research and development
program is focused on the advancement and diversification of the HEXFET  product
line  and expansion of the  related IGBT products. Efforts  are also directed to
the development of Control ICs and power products that work in combination  with
HEXFETs  and IGBTs to  improve system performance. The  increase in research and
development  expenditures  in  fiscal  1993  contributed  to  more  new  product
introductions in fiscal 1993.

    Other  expense included a $1.1 million charge for the settlement of a breach
of contract lawsuit, $1.1 million of severance costs and $0.2 million related to
the buyout of a lease upon early termination.

SEASONALITY

    The Company has experienced moderate  seasonality in its business in  recent
years.  On  average  over  the  past  three  years,  the  Company  has  reported
approximately 47% of annual  revenues in the  first half and  53% in the  second
half of its fiscal year.

LIQUIDITY AND CAPITAL RESOURCES

    At September 30, 1994, the Company had established $79.0 million in domestic
and  foreign  revolving  credit  facilities, of  which  $34.9  million  had been
borrowed by the Company.  Based upon covenant  and collateral limitations  under
the  revolving credit  facilities, the Company  had $23.9  million available for
borrowing at September 30, 1994. In addition, at September 30, 1994 the  Company
had  available $16.6  million of unused  lines of credit  for capital equipment,
$11.6 million of cash and cash equivalents and had made purchase commitments  of
approximately  $9.2  million for  capital  equipment. See  "Note  2 --  Notes to
Consolidated Financial Statements -- Long-Term Debt and Other Loans."

    The Company  intends to  spend approximately  $75.0 million  (of which  $4.9
million  has been spent through September  30, 1994) to expand wafer fabrication
capacity at  its  HEXFET America  facility,  most of  which  is expected  to  be
expended in fiscal 1995. In addition, the Company intends to spend approximately
$35.0  million (of which $9.3 million has been spent through September 30, 1994)
to expand and maintain assembly capacity, to enhance its Management  Information
Systems  infrastructure  and to  maintain its  existing facilities.  The Company
intends to fund  these capital  expenditures and meet  its short-term  liquidity
requirements  through cash and cash equivalents  on hand, anticipated cash flows
from operations, funds available from existing credit facilities and from  funds
received from the Offerings. The Company is also negotiating with the Industrial
Development  Authority of the County of Riverside, California for an issuance of
$25.0 million of taxable industrial  development bonds which will be  indirectly
backed  by the  U.S. Department of  Housing and Urban  Development. The proceeds
will be  loaned  to  IR  for  the  expansion  at  HEXFET  America  and  will  be
collateralized  by the real property at HEXFET America. However, there can be no
assurance that any financing will be available under cost-effective terms.

    Although the Company believes that the class action lawsuits brought against
the Company and its Board of Directors (See "Business -- Legal Proceedings") are
without merit, the ultimate outcome, and any effect on liquidity, thereof cannot
be presently determined. For  the possible effects  of environmental and  patent
matters  on liquidity, see "Business -- Environmental Matters," "-- Intellectual
Property" and "-- Legal Proceedings." The Company has not made any provision for
liability, if any, that may result upon adjudication of these matters.

INCOME TAXES

    Due in part to the utilization of net operating loss carryforwards ("NOLs"),
the Company's effective income tax rate for the three months ended September 30,
1994 and fiscal 1994 was approximately  17%. At September 30, 1994, the  Company
had  NOLs of approximately $23.5 million  for federal income tax purposes. These
NOLs expire beginning in 2004. The  Company also has approximately $5.3  million
of  tax credits available to offset future  U.S. taxes. In addition, the Company
anticipates that it  will be eligible  to receive California  state tax  credits
equal  to 6% of the cost of most of the Company's equipment purchased and placed
in service in California on  or after January 1, 1994.  When the NOLs and  other
available  tax credits  are fully  utilized, the  Company will  be subject  to a
normalized tax rate in the range of 35% to 40%.

                                       14
<PAGE>
                                    BUSINESS

    The Company  is a  major worldwide  supplier of  power semiconductors  which
convert  electricity at relatively  high voltage and  current levels in products
such  as  automobiles,  communications  equipment,  computers  and  peripherals,
consumer electronics and lighting, industrial equipment and office equipment.

    The Company designs, manufactures and markets power semiconductors which are
used  for  power conversion.  In the  same way  that oil  is refined  to produce
gasoline to power a car, electricity has to be converted to create useable power
to operate equipment.  This process of  power conversion can  be viewed in  four
stages:  input rectification, control, switching and output rectification. Input
rectification conditions off-line electricity, typically rectifying  alternating
current  to direct current.  The control function  measures incoming electricity
and sends a  signal to a  switch. A  switch packages the  current into  discrete
units.  Output rectification  reconfigures the  elements into  a form  usable by
electrically operated equipment.  The ability  of power  conversion products  to
minimize energy lost at each stage in the power conversion process is central to
their value.

    Because  IR supplies products that perform  each of the four basic functions
in power conversion, many circuits  use more than one  type of IR product.  This
allows IR to develop and package products that work together to optimize overall
circuit  performance  and  enables the  Company  to capitalize  more  broadly on
market-leading products.

                                    [CHART]

ILLUSTRATION DESCRIPTION:
Block diagram demonstrating sequence of four power conversion functions with
detail of associated processes and products.

    IR's products are used in all  major market sectors. Applications for  power
semiconductors  in  automobiles  include anti-lock  braking  and  fuel injection
systems, power  accessories and  air bags.  Communications applications  include
telephone  networks, satellites and modems. Computer and peripheral applications
include power  supplies and  disk  drives for  desktop, mainframe  and  portable
computers  and printers. Consumer electronics  and lighting applications include
home entertainment  equipment,  household appliances  and  fluorescent  lighting
ballasts.  Power semiconductors are also  used widely in industrial applications
such as  motor-driven  production  lines, instrumentation  and  test  equipment,
machine  tools, fork  lifts and  welders. Office  equipment applications include
copiers and facsimile machines.

   
    According to statistics for calendar 1993 published by the SIA, the  Company
had  a 17%  market share of  the $1.1  billion power MOS  transistor segment. In
addition, the Company sold approximately $19.1 million of power MOSFET and  IGBT
chips  and wafers  to third parties  in calendar 1993.  Accordingly, the Company
believes it is the  world leader in  the power MOS  transistor market. SIA  data
indicates  that industry-wide  sales of power  MOS transistors  in calendar 1993
increased 23% over 1992 levels,  and that, over the  past five years, power  MOS
transistor sales have grown at an average rate of 26% per year.
    

    The  Company's  major  customers  include  industry  leaders  such  as  AT&T
Technologies Inc., Conner Peripherals, Inc., General Motors Corporation, Hewlett
Packard  Co.,  International  Business   Machines  Corp.,  Matsushita   Electric
Industrial  Company, Ltd.,  Sanken Electric Company,  Ltd., Siemens  AG and Sony
Corporation. In fiscal  1994, over 50%  of the Company's  sales were to  foreign
customers, divided almost evenly between Europe and Asia, and the remainder were
to customers in North America.

                                       15
<PAGE>
POWER SEMICONDUCTOR INDUSTRY

    Semiconductors  are silicon-based chips that  conduct and block electricity.
The semiconductor industry consists principally of the integrated circuit ("IC")
and power semiconductor segments. Power semiconductors operate differently  from
ICs  that operate  at low  power levels  and process  and convey  information in
electronic form.  IC capability  is largely  defined by  circuit density,  which
increases  as  its  features  are miniaturized.  The  applications  for  ICs are
generally concentrated  in  the  computer  industry and  have  been  subject  to
frequent  redesign,  short  product life  cycles  and rapid  obsolescence.  As a
result, the demand for ICs has been highly cyclical.

    In contrast to ICs, power semiconductors operate at higher power levels  and
perform  a single function: they convert  electricity to operate a power supply,
control a motor  or light a  lamp. Their  capability is largely  defined by  the
level  of power that they can handle and their efficiency in converting electric
current into a more useful form. The amount of electric current handled and  the
heat generated limit the rate at which power semiconductors can be miniaturized.

    Advances    in   power   semiconductor    performance   and   decreases   in
cost-per-function have been achieved  through the use  of MOS technology.  Power
MOS transistors (power MOSFETs and IGBTs) have gained an increasing share of the
power  transistor market. Power MOS  transistors offer significant benefits over
bipolar  transistors,  which  are  power  semiconductors  that  also  serve  the
switching  function. Power MOS transistors provide much greater switching speed,
which allows the design  of higher frequency, more  compact circuits. Power  MOS
transistors  are activated by voltage rather  than current, so they require less
external circuitry to  operate, making  them more compatible  with IC  controls.
They also offer more reliable long-term performance and are more rugged, so they
can  better withstand adverse  operating conditions. In  addition, power MOSFETs
and IGBTs compare favorably to bipolar power transistors on a price/ performance
basis. The graph  below presents SIA  data on sales  of bipolar transistors  and
sales of power MOS transistors from calendar 1987 to 1993.

             SALES OF BIPOLAR TRANSISTORS AND POWER MOS TRANSISTORS

                                    [GRAPH]

GRAPH DESCRIPTION:
Area graph of SIA figures on worldwide bipolar and MOS power transistor sales in
dollars for calendar years 1987-1993.

EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC

<TABLE>
<CAPTION>
                            Power     Bipolar
<S>                       <C>        <C>
1987                         0.2        1.2
1988                         0.3        1.5
1989                         0.4        1.4
1990                         0.6        1.5
1991                         0.7        1.4
1992                         0.9        1.4
1993                         1.1        1.6
</TABLE>

APPLICATIONS

    Power  semiconductors  are  used  in  a  broad  spectrum  of  commercial and
industrial applications,  including many  products with  long life  cycles.  The
Company  believes that the demand for power semiconductors is less cyclical than
ICs,  given   power   semiconductors'   longer   product   lives   and   diverse

                                       16
<PAGE>
applications.  Power semiconductor demand is driven  by growth in their end-user
markets, replacement of bipolar transistors and proliferation of new end-product
applications. The Company believes that markets driving future demand for  power
semiconductors include:

    PORTABLE  ELECTRONICS.  Advances in power semiconductors help extend battery
life and reduce product size and weight in a variety of products such as  laptop
and  notebook  computers,  personal  digital  organizers,  cellular  telephones,
battery-operated appliances and hand tools.

    AUTOMOTIVE ELECTRONIC SYSTEMS.  The concentration of solid state electronics
in recent model year automobiles has increased rapidly with the proliferation of
safety and comfort features. Applications include anti-lock braking systems, air
bags, fuel injection systems, electric windows and adjustable mirrors and seats.
Adoption of  battery  operated  electric  vehicles  to  reduce  emissions  would
dramatically increase consumption of power MOS transistors.

    ELECTRONIC   LIGHTING  BALLASTS.     Electronic   lighting  ballasts,  which
incorporate power MOS  transistors, significantly  reduce the  amount of  energy
consumed in lighting. Conversion to electronic ballasts has been driven by lower
end-user  operating  costs, longer  product  life and  incentives  from electric
utilities to encourage energy efficiency.

    VARIABLE SPEED MOTORS.  Variable-speed, solid-state controls increase energy
efficiency and performance in a broad range of industrial and appliance  motors.
In  addition, clean air  legislation is driving  the conversion from traditional
chlorofluorocarbons ("CFCs") to less toxic refrigerants which compromise  energy
efficiency.  Manufacturers of refrigerators and  air conditioners compensate for
these less efficient  chemicals by  using more  efficient variable-speed  motors
controlled by power semiconductors.

PRODUCTS

   
    The  Company's power MOS transistors  (principally power MOSFETs), chips and
wafers comprised over two-thirds of fiscal 1994 sales. IR also supplies  Control
ICs,  high  performance diodes  and high  power  rectifiers and  thyristors. The
Company believes that this complete line of power conversion products represents
a competitive advantage,  as IR  is able  to provide  customers with  integrated
solutions to their power conversion needs.
    

    The  Company's fastest-growing products have  comprised a greater proportion
of its total  revenues during each  of the  past three fiscal  years. The  table
below shows revenues of IR's growth and mature products in dollar amounts and as
a  percentage of revenues for the periods indicated. Dollar amounts in the table
below are in millions.

<TABLE>
<CAPTION>
                      THREE MONTHS ENDED SEPTEMBER 30,
                                 (UNAUDITED)                           FISCAL YEARS ENDED JUNE 30,
                      ---------------------------------   ------------------------------------------------------
                           1994              1993               1994               1993               1992
                      ---------------   ---------------   ----------------   ----------------   ----------------
<S>                   <C>    <C>        <C>    <C>        <C>     <C>        <C>     <C>        <C>     <C>
Growth (1)..........  $ 77.1   83.6%    $ 60.5   82.8%    $ 269.3   81.9%    $ 218.2   77.5%    $ 201.2   75.8%
Mature (2)..........    15.2   16.4       12.6   17.2        59.6   18.1        63.5   22.5        64.3   24.2
                      -----  --------   -----  --------   ------  --------   ------  --------   ------  --------
   Total............  $ 92.3  100.0%    $ 73.1  100.0%    $ 328.9  100.0%    $ 281.7  100.0%    $ 265.5  100.0%
                      -----  --------   -----  --------   ------  --------   ------  --------   ------  --------
                      -----  --------   -----  --------   ------  --------   ------  --------   ------  --------
<FN>
- ------------------------
(1)  Growth product revenues consist of revenues from HEXFETs, Schottky  diodes,
     Fast Recovery diodes, IGBTs, Control ICs and patent royalties.

(2)  Mature  product revenues consist of revenues from high power rectifiers and
     thyristors.
</TABLE>

    SWITCHING PRODUCTS

    Power MOS transistors (power MOSFETs and IGBTs) serve the switching function
in power conversion  to provide an  even, useable flow  of power for  electronic
equipment.

        POWER MOSFETS.  Through its HEXFET product line, the Company believes it
is  the world leader in  power MOSFETs. The breadth  and diversity of the market
for these products provide an element of stability in demand.

                                       17
<PAGE>
    Applications for  MOSFETs  in  automobiles include  anti-lock  brakes,  fuel
injection   systems,  power   accessories  and   air  bags.  Computer/peripheral
applications include power supplies, disk drives and printers. Office  equipment
applications  include  copiers  and  facsimile  machines.  Consumer  electronics
applications include home entertainment, videocameras, household appliances  and
power  tools. Lighting applications include  electronic fluorescent ballasts and
compact   fluorescent   bulbs.   Industrial   applications   include    welding,
instrumentation   and   test   equipment   and   automated   production   lines.
Communications applications include  telephone networks  and modems.  Government
and   aerospace  applications   include  commercial   and  military  satellites,
communications equipment, command-and-control systems and missiles.

    Market acceptance and brand recognition  of HEXFETs have benefited from  the
Company's  emphasis on quality control and reliability, and the Company believes
its standards to  be among the  most stringent in  the industry. Cumulative  and
current  data on  long and short-term  product reliability is  made available to
customers quarterly.

        IGBTS.   IGBTs are  particularly effective  in providing  the  switching
function  in  power  conversion  applications that  require  higher  current and
voltage. IGBTs combine the ease  of voltage-driven power MOSFET technology  with
the  conduction efficiency of bipolar transistor technology. The performance and
ruggedness of  these devices  enable  them to  replace bipolar  transistors  and
thyristors   in  many   high-voltage,  high-current  motor   control  and  power
conditioning applications. Energy-efficient,  variable-speed motor controls  are
an emerging application, and the Company believes electric vehicles will require
large  quantities of  IGBTs for each  vehicle. The Company's  IGBT technology is
closely related  to  its  HEXFET  technology, and  the  Company  views  them  as
complementary products.

    CONTROL PRODUCTS

    Control  ICs serve the  control function in  power conversion. These devices
perform the functions  of several discrete  components. This integration  allows
circuit  designers to simplify circuit  design and assembly, improve reliability
and reduce overall system  size and cost. In  sensing and responding to  adverse
operating  conditions,  Control  IC  performance  is  superior  to  a  safety or
diagnostic circuit  using discrete  components.  IR's Control  ICs draw  on  the
Company's  power  MOSFET technology  and are  designed to  operate at  very high
voltages and optimize the performance of both MOSFETs and IGBTs.

    Control ICs are used in  a wide variety of  power supply, motor control  and
lighting  applications. These  include industrial motor  controls, stepper motor
controls, solenoid drivers, welding  equipment, telecom switchers, computer  and
peripherals,  instrumentation and test  equipment, fluorescent lighting ballasts
and compact fluorescent light bulbs.

    INPUT RECTIFICATION PRODUCTS

    The Company  also  manufactures  a  broad line  of  rectifiers,  diodes  and
thyristors  that  serve the  input rectification  function in  power conversion.
These products convert power to make it more efficient and useable,  principally
in  industrial end products that require  power-handling capability from one amp
to 5,000 amps  and from  120 volts to  5,000 volts.  Applications include  motor
controls  and lighting, welding equipment,  fork lifts, machine tools, induction
heating, locomotives,  motor-driven  production lines,  smelting  equipment  and
power supplies.

    OUTPUT RECTIFICATION PRODUCTS

   
    The  Company's Schottky  diodes and  Fast Recovery  diodes serve  the output
rectification function in  power conversion.  Output rectification  reconfigures
electricity  into a  form useable  by electrically  operated equipment. Schottky
diodes are  used  with power  MOSFETs  in high-frequency  applications  such  as
computers  and peripherals.  The Company's trademarked  HEXFRED-R- Fast Recovery
diodes are used with IGBTs in higher current, lower frequency applications  such
as motor controls.
    

MANUFACTURING

    Semiconductor   manufacturing  involves  two  phases  of  production:  wafer
fabrication and  assembly (or  packaging). Wafer  fabrication is  a sequence  of
process  steps  that  exposes  silicon wafers  to  chemicals  that  change their
electrical properties. The chemicals are applied in sequences that create  cells
or circuits within

                                       18
<PAGE>
numerous  individual  devices (often  termed "die"  or  "chips") on  each wafer.
Packaging or assembly is the sequence of production steps that divide the  wafer
into  individual  chips and  enclose the  chips  in external  structures (termed
packages) that  make them  useable  in a  circuit. Wafer  fabrication  generally
employs process technology and equipment already proven in IC manufacturing.

    The  Company  has production  facilities in  California, England,  Italy and
Mexico. In  addition, the  Company  has equipment  at, or  manufacturing  supply
agreements  with,  assembly subcontractors  located  in the  United  States, the
Philippines, Japan, Taiwan and Malaysia. IR fabricates substantially all of  its
power  MOSFET  wafers  at  HEXFET  America  in  Temecula,  California.  A  wafer
fabrication facility  for IGBTs  and other  power MOSFET  devices, and  assembly
operations for government and other advanced products are located in El Segundo,
California.  Facilities  that assemble  HEXFETs  and other  growth  products are
located in  the United  States and  overseas, in  Company-owned and  subcontract
facilities, in order to take advantage of low assembly costs and provide maximum
customer  service.  In  Tijuana,  Mexico,  the  Company  assembles  power MOSFET
products, IGBTs and other modules. The Company's Oxted, England facility,  which
qualifies as a duty-free warehouse, assembles power MOSFETs and IGBTs as well as
products   used   in  certain   military   applications.  Since   completion  of
consolidation of its three input rectification manufacturing sites in the  third
quarter  of fiscal 1994, the Company has manufactured substantially all its high
power rectifiers and thyristors at its  Turin, Italy facility. In addition,  the
Company  has an assembly  facility for rectifiers and  thyristors in a duty-free
zone in India.

   
    To meet rising demand  for power MOS transistors,  the Company is  expanding
wafer fabrication capacity at HEXFET America. Planned to be in production by the
end  of  calendar 1995,  the  Company believes  that  the estimated  $75 million
expansion will ultimately increase HEXFET America's wafer capacity in power  MOS
transistors by about 75%. The expansion will position IR to aggressively address
the  fastest growing segments of the power transistor market, high density power
MOSFETs and IGBTs. Next-generation  devices designed for  production in the  new
fabrication   facility  incorporate  design  and  process  advancements  in  the
Company's proprietary HEXFET and IGBT technologies. The facility is designed  to
combine  the  flexibility of  manufacturing both  power  MOSFETs and  IGBTs with
efficient, high-volume  manufacturing techniques  that reduce  cycle times.  The
fabrication  will be performed on six-inch wafers and will use a continuous-flow
layout similar to  the one already  in use  at HEXFET America.  The facility  is
different  from the functional layout that the Company believes is commonly used
by other  semiconductor manufacturers.  Highly automated  processing and  supply
systems  for gases, water, and other  processing chemicals have also contributed
to continuous improvements in wafer yields  at this facility. Pilot runs of  the
new  products on the  specified equipment are already  underway at the Company's
facility in El Segundo, California.
    

    HEXFET America  was  selected  for the  fabrication  expansion  because  the
Company  believes it offers several important benefits. Expanding at an existing
facility should allow  the Company to  invest less in  construction and more  in
production capacity. It should require fewer additional employees than a totally
new  facility would and will  enable IR to start  up and operate the fabrication
with  experienced  staff  already  on  site.  The  Company  believes  that   the
accessibility  of HEXFET America to the Company's research and development staff
in El  Segundo has  eased  in the  past,  and should  ease  in the  future,  the
transition  of the products from development to manufacturing. See "Risk Factors
- -- Expansion Risks" and "-- Manufacturing Risks."

MARKETING, SALES AND DISTRIBUTION

    The Company markets  its products through  sales personnel,  representatives
and  distributors. The Company believes its ability to offer products that serve
each of the four functions of power conversion enhances its competitive position
in the overall power semiconductor market.

    In fiscal year 1994, more than half  of the Company's sales were to  foreign
customers, divided almost evenly between Europe and Asia, and the remainder were
to  customers in  North America.  The Company's  domestic direct  sales force is
organized in  four sales  zones.  In Europe,  the  Company's products  are  sold
through  its own sales force  as well as through  sales agents and distributors.
The Company has  European sales  and representative offices  in England,  Italy,
Sweden, France, Germany, Finland, Denmark, Poland, the

                                       19
<PAGE>
Czech  Republic and Hungary. In Asia, IR has sales and representative offices in
Japan, Singapore, Hong Kong, Korea and India. IR has well established, exclusive
relationships with agents and  representatives in most  major markets which  are
not   served  directly  by  IR  personnel.  See  "Risk  Factors  --  Significant
International Operations."

    Because many applications require products from several product groups,  the
Company  has  organized  its marketing  efforts  by market  sector,  rather than
product type. These business management  groups focus on several key  commercial
sectors  and on  government and aerospace  business. In  addition, the Company's
staff of applications  engineers provides  customers with  technical advice  and
support regarding the use of IR's products.

CUSTOMERS

    In  most cases,  the Company's  devices are  incorporated in  larger systems
manufactured by  end  product  manufacturers. The  Company's  customers  in  the
automotive  segment  include Robert  Bosch,  Ltd., Ford  Motor  Company, General
Motors Corporation,  NipponDenso Co.,  Ltd.,  and Siemens  AG. In  the  computer
segment,   IR's  customers   include  Apple  Computer,   Inc.,  Compaq  Computer
Corporation, Hewlett  Packard  Co.  and International  Business  Machines  Corp.
Consumer electronics customers include Bose Corporation, Philips and Electronics
N.V.  and Sony Corporation. Customers  in the telecommunications segment include
AT&T Technologies,  Inc. and  Nokia.  The Company  also  sells its  products  to
distributors including Arrow Electronics, Inc. and Future Electronics, Inc.

BACKLOG

    As of September 30, 1994, the Company's backlog of orders was $132.5 million
compared to $85.6 million as of September 30, 1993 and $121.8 million as of June
30,  1994.  Backlog  represents purchase  orders  which have  been  released for
shipment and are  scheduled to  be shipped within  the following  12 months.  In
accordance  with  industry practice,  IR  may in  certain  circumstances release
customers from purchase  orders without penalty.  Increasingly, major  customers
are operating their businesses with shorter lead times and are placing orders on
a periodic rather than an annual basis. Orders are cancelable and backlog is not
necessarily indicative of sales for any future period.

RESEARCH AND DEVELOPMENT

    The  Company is involved in ongoing research and development directed toward
new processes, devices and packages as well as continued improvement of  quality
and  reliability in existing products. In fiscal  years 1994, 1993 and 1992, the
Company spent  approximately  $16.4 million,  $14.1  million and  $9.4  million,
respectively,  on  research  and  development activities.  In  fiscal  1994, the
Company  introduced  a   variety  of   products  designed   to  address   growth
opportunities identified by market sector: high-density, high-efficiency HEXFETs
and  surface-mount packages for  portable electronics; Control  ICs for lighting
and motor control  applications; IGBT  modules for motor  controls; and  HEXFETs
with  diagnostic and  safety features for  auto applications.  IR's research and
development program is focused  on advancing and  diversifying the power  MOSFET
product line, expanding the related IGBT products and developing Control ICs and
other  power products that work  in combination with power  MOSFETs and IGBTs to
improve system performance. IR's research and development staff also works  with
the  marketing  staff to  develop new  products  that address  specific customer
needs. Efforts are  directed towards  developing new processes  that enable  the
Company to produce smaller, more efficient devices. Efforts are also directed at
reducing  assembly  costs  and  developing  new  package  designs  and  assembly
processes.

INTELLECTUAL PROPERTY

    The Company has  made significant investments  in developing and  protecting
its  intellectual property. Through  successful enforcement of  its patents, the
Company has  entered into  a  number of  license agreements,  generated  royalty
income  and  received  substantial  payments in  settlement  of  litigation. The
Company currently has 61 U.S. patents and 37 U.S. patents pending. Those patents
fundamental to  the  Company's  operations  expire between  2000  and  2010.  In
addition, the Company has 67 foreign patents and 57 foreign patents pending in a
number of countries. IR is also licensed to use certain patents owned by others.
Under  the terms  of an agreement  with Unitrode Corporation  that terminates in
March 2000, the

                                       20
<PAGE>
Company pays Unitrode Corporation approximately  12% of IR's net patent  royalty
income.  The Company has several registered  trademarks in the United States and
abroad  including  trademarks  for  HEXFET.   The  Company  believes  that   its
proprietary  technology and intellectual property  contribute to its competitive
advantage. See "Risk Factors -- Protection of Intellectual Property."

    Since the  Company  believes  that  its power  MOSFET  patents  are  broadly
applicable,  it is committed to enforcing its  rights under those patents and is
pursuing   additional   license   agreements.   The   Company   presently    has
royalty-bearing  license  agreements  with  11  companies:  Harris  Corporation;
Hitachi,  Ltd.;  Matsushita  Electronics  Corporation;  National   Semiconductor
Corporation;  NEC  Corporation;  Nihon  Inter  Electronics  Corporation;  Sanken
Electric  Company,   Ltd.;   SGS-Thomson   Microelectronics,   Inc.;   Siliconix
incorporated;  Toshiba Corporation;  and Unitrode  Corporation. In  fiscal 1994,
$9.0  million  of  revenues  were  derived  from  such  royalty-bearing  license
agreements.

    Certain  of  the  Company's  fundamental  power  MOSFET  patents  have  been
subjected, and continue to be subjected,  to reexamination in the United  States
Patent  and Trademark  Office ("PTO"). In  September 1994 the  PTO undertook the
reexamination of U.S. patent 5,008,725, one of the Company's principal power MOS
transistor patents. This patent has previously been confirmed on  reexamination.
See "Note 9 -- Notes to Consolidated Financial Statements--Intellectual Property
Rights."  Although no assurance can  be given as to  the ultimate outcome of the
Company's patent enforcement efforts, the  PTO reexamination proceedings or  the
success of the Company's patent licensing program, the Company believes that its
patent portfolio will be the source of continuing royalty income.

COMPETITION

    The  Company  encounters differing  degrees of  competition for  its various
products, depending upon  the nature of  the product and  the particular  market
served. Generally, the semiconductor industry is highly competitive, and many of
the  Company's competitors are larger companies with greater financial resources
than IR. The Company believes that its  breadth of product line and its  ability
to  bundle products that serve the different power conversion functions into one
package distinguish it from its competitors. IR's products compete with products
manufactured by others based on quality, price, reliability, overall performance
of the products,  breadth and  availability of  products, delivery  time to  the
customer  and service  (including technical  advice and  support). The Company's
competitors include Eupec, Harris Corporation, Hitachi Ltd., Motorola, Inc., NEC
Corporation, Philips International  B.V., Powerex,  Inc., Samsung  Semiconductor
Inc.,  SGS-Thomson Microelectronics, Siemens AG, Siliconix incorporated, Toshiba
Corporation and Westcode Semiconductors Ltd. See "Risk Factors -- Competition."

ENVIRONMENTAL MATTERS

    Federal, state and  local laws and  regulations impose various  restrictions
and  controls on the discharge of certain materials, chemicals and gases used in
semiconductor processing. The Company does not believe that compliance with such
laws and  regulations will  have  a material  adverse  effect on  its  financial
position.

    The  Company  and  Rachelle  Laboratories,  Inc.  ("Rachelle"),  its  former
pharmaceutical subsidiary which discontinued operations in 1986, have been named
among several hundred entities as potentially responsible parties ("PRPs") under
the provisions  of the  Comprehensive Environmental  Response, Compensation  and
Liability  Act  of  1980  ("CERCLA"),  in  connection  with  the  United  States
Environmental Protection  Agency's  ("EPA")  investigation of  the  disposal  of
allegedly  hazardous  substances at  a major  superfund  site in  Monterey Park,
California (the "OII site").  Certain PRPs who settled  certain claims with  the
EPA  under consent  decrees filed suit  in Federal  Court in May  1992 against a
number of other  PRPs, including IR,  for cost recovery  and contribution  under
CERCLA.  The  lawsuit  against IR,  relating  to  the first  and  second consent
decrees, was settled in August 1993 for  the sum of $40,000 to avoid  protracted
and expensive litigation. Claims have been made with the Company's insurers with
respect  to the  OII site matter;  however, there  can be no  assurance that the
insurance coverage attaches  to these  claims. There remains  the potential  for
litigation  against IR and Rachelle  relating to the OII  site. The Company does
not believe that either it  or Rachelle is responsible  for the disposal at  the
OII  site  of  any  material  constituting  hazardous  substances  under CERCLA.
Although the ultimate resolution of this matter is unknown, the Company believes
that it will not have a material adverse impact on its financial position.

                                       21
<PAGE>
    In May 1993 the Company purchased property from its Employee Profit  Sharing
and  Retirement Plan. It was  determined that the property  required clean up of
seepage from a storage  tank, at an estimated  additional cost of $500,000.  The
Company commenced the clean up in fiscal year 1994, and the costs to be incurred
will be capitalized as additional costs of the property.

    On July 18, 1994, the Company received a letter from the State of Washington
Department  of Ecology  (the "Department") notifying  the Company  of a proposed
finding that the Company is a potentially liable person ("PLP") for alleged  PCE
contamination  (also known as  perchloroethylene, tetrachloroethylene, and other
names) of real property and groundwater in Yakima County, Washington. The letter
alleges that  the Company  arranged for  disposal  or treatment  of the  PCE  or
arranged  with a transporter for the disposal  or treatment of the PCE in Yakima
County. The Company replied by  a letter dated August  11, 1994 stating that  it
has  not contributed to PCE or other  solvent contamination at the Yakima County
site and that it should not be designated a PLP. On October 11, 1994 the Company
received a letter from the Department notifying the Company of its finding  that
the Company is a PLP in the above matter.

    The  Company received a  letter dated September  9, 1994, from  the State of
California Department of Toxic Substances  Control stating that the Company  may
be  a PRP  for the deposit  of hazardous  substances at a  facility in Whittier,
California. The  Company's  investigation of  this  matter has  just  begun  and
therefore an opinion cannot be expressed as to any ultimate responsibility.

LEGAL PROCEEDINGS

    The  Company and SGS-Thomson  Microelectronics, Inc. ("SGS")  are engaged in
various legal proceedings relating to their respective power MOSFET patents. SGS
filed suit against the Company in June 1991 in Federal District Court in  Texas,
charging  infringement of U.S.  patent 4,553,314. On motion  by the Company, the
suit was transferred to the Federal  District Court in Los Angeles,  California,
and  thereafter SGS amended its complaint to charge infringement of U.S. patents
4,495,513 and 4,712,127.  SGS alleges,  in substance, that  the Company's  power
MOSFET  and  IGBT products  infringe the  '314 patent,  that the  Company's IGBT
products infringe the '513  patent and that certain  packages for IR's  products
(including  certain  power  MOSFET  packages)  infringe  the  '127  patent.  The
complaint, as amended,  seeks unspecified actual  damages (but no  less than  an
unspecified  reasonable royalty) and an  injunction restraining further sales of
such products. On February  1, 1993, the District  Court dismissed SGS's  claims
for  infringement of the '127 and '513 patents for lack of standing and on March
15, 1993 ruled  that the  SGS '314 patent  is unenforceable  due to  inequitable
conduct.  SGS appealed these rulings, as well as the order transferring the case
to  California,  to  the   Court  of  Appeals  for   the  Federal  Circuit.   IR
cross-appealed  a separate ruling by the  District Court denying IR's motion for
summary judgment that  the '314  patent is invalid.  In July  1994, the  Federal
Circuit reversed the District Court's grants of summary judgment as to the '513,
'127  and '314 patents and  affirmed the District Court's  denial of IR's motion
for summary  judgment of  invalidity of  the '314  patent. The  Federal  Circuit
ordered,  however, that the  case should proceed  in California. Cross-petitions
for writs of  certiorari are pending  before the  U.S. Supreme Court  as to  the
jurisdictional  and venue rulings of the Federal  Circuit. No trial date has yet
been set and the  ultimate outcome of the  case as to the  three SGS patents  is
unknown.

    In separate proceedings before the same California District Court, IR sought
enforcement  of a prior license agreement between  IR and SGS. The Court in July
1994 granted the Company's  motions to enforce the  license agreement with  SGS,
requiring  SGS to pay additional past  and prospective royalties under IR's U.S.
patents 4,959,699 and 4,642,666 on SGS's  sales of power MOSFET, IGBT and  power
IC  products. SGS has  filed a separate  appeal of this  ruling with the Federal
Circuit.

    The Company has  also filed  a separate action  in the  same District  Court
against  SGS and  its Italian  affiliate, SGS-Thomson  Microelectronics, S.r.l.,
seeking an  injunction  against  infringement  of  the  Company's  U.S.  patents
5,008,725  and 5,130,767. Trial of the Company's action has been set for January
25, 1995.

    The  Company,  its  directors  and  certain  officers  have  been  named  as
defendants  in three class action lawsuits filed in federal court in California.
These suits seek unspecified but  substantial compensatory and punitive  damages
for  alleged intentional and negligent  misrepresentations and violations of the
federal

                                       22
<PAGE>
securities laws. The complaints generally allege that the Company and the  other
defendants  made materially false statements or  omitted to state material facts
in connection with the public offering  of the Company's common stock  completed
in April 1991 and the redemption and conversion in June 1991 of the Company's 9%
Convertible  Subordinated  Debentures  Due  2010.  They  also  allege  that  the
Company's projections  for growth  in fiscal  1992 were  materially  misleading.
Although  the Company believes that the claims  alleged in the suits are without
merit, the  ultimate  outcome  cannot be  presently  determined.  A  substantial
judgment  or settlement,  if any,  could have a  material adverse  effect on the
Company's financial condition and results of operations. Two of these suits also
name Kidder, Peabody & Co. Incorporated and Montgomery Securities as defendants.

    No provision for any  liability that may result  upon adjudication of  these
matters has been made in the consolidated financial statements.

EMPLOYEES

    As  of September 30, 1994, the  Company employed approximately 3,150 people,
of whom approximately 2,140 are employed in North America, 960 in Europe and  50
in Asia. The Company is not a party to any collective bargaining agreements. The
Company considers its relations with its employees to be good.

PROPERTIES

    The  Company's  operations occupy  a total  of approximately  864,000 square
feet, of which approximately 477,000 square  feet are located within the  United
States. Of the worldwide total, approximately 247,000 square feet are leased and
the balance is owned by the Company.

    IR's  leases expire between 1995 and 2012. If the Company is unable to renew
these leases upon  expiration, it  believes that  it could  find other  suitable
premises without any material adverse impact on its operations.

    The Company's major facilities are in the following locations:

<TABLE>
<CAPTION>
                                               TOTAL SQUARE FEET
                                            -----------------------
FACILITY                                      OWNED       LEASED             EXPIRATION OF LEASE
- ------------------------------------------  ---------  ------------  -----------------------------------
<S>                                         <C>        <C>           <C>
Temecula, California......................    287,000         --                     --
El Segundo, California....................     93,000     91,000     July 31, 1995 - July 31, 2004
Tijuana, Mexico...........................         --     89,000     (1)
Oxted, England............................     45,000     15,000     March 27, 2012
Turin, Italy..............................    110,000      6,000     June 30, 1995 - March 31, 1998
<FN>
- ------------------------
(1)  Since  the Company's lease  on its assembly facility  in Mexico expired, it
     has rented the same space on a month to month basis due to pending rezoning
     of the neighborhood. The Company has identified comparable space  available
     for lease on comparable terms if such assembly facility needs to be moved.
</TABLE>

   
    The  Company believes that these facilities are adequate for its current and
anticipated near term operating needs.  IR estimates that it currently  utilizes
approximately 81% of its worldwide manufacturing capacity. To meet rising demand
for  power MOS transistors, the Company is expanding wafer fabrication at HEXFET
America. Planned to be in  production by the end  of calendar 1995, the  Company
believes  that  the estimated  $75  million expansion  will  ultimately increase
HEXFET America's wafer fabrication capacity by about 75%.
    

    The Company has nine sales offices located throughout the United States, and
other sales and technical support offices in Canada, France, Germany, Hong Kong,
India, China, Singapore, and Scandinavia that operate in leased facilities.

                                       23
<PAGE>
                                   MANAGEMENT

    The executive officers and directors of IR are:

<TABLE>
<CAPTION>
NAME                              AGE      TITLE
- ----------------------------      ---      ----------------------------------------------------------
<S>                           <C>          <C>
Eric Lidow                            81   President; Chairman of the Board; Chief Executive Officer
Alexander Lidow                       39   Executive Vice President - Operations; Director
Derek B. Lidow                        41   Executive Vice President; Director
Robert J. Mueller                     65   Executive Vice President - External Affairs and Business
                                            Development; Director
Michael P. McGee                      35   Vice President - Chief Financial Officer
Donald S. Burns                       69   Director
George Krsek                          73   Director
James D. Plummer                      49   Director
Jack O. Vance                         69   Director
Rochus E. Vogt                        64   Director
</TABLE>

    Eric  Lidow is  a founder of  the Company  and has been  the Chief Executive
Officer and a director of the Company since its inception in 1947.

    Alexander Lidow, Ph.D.,  has been  employed by  the Company  since 1977.  He
served as the Semiconductor Division's Vice President - Research and Development
since July 1979, was promoted to Semiconductor Division Executive Vice President
- -Manufacturing  and Technology  in March 1985,  and became the  President of the
Electronic Products Division in July 1989. In August 1992, Dr. Lidow was elected
Executive Vice President of Operations. He  was elected a director in  September
1994. Dr. Lidow is a son of Eric Lidow.

    Derek  B. Lidow,  Ph.D., has  been employed  by the  Company since  1976. He
served as the Semiconductor Division's  Vice President - Operations since  March
1980,  was  promoted  to  Semiconductor  Division  Executive  Vice  President  -
Marketing and Administration in  March 1985, and became  President of the  Power
Products  Division in July 1989. In August 1992, Dr. Lidow was elected Executive
Vice President and in July 1993 assumed responsibilities for worldwide sales and
marketing. He was elected a  director in September 1994. Dr.  Lidow is a son  of
Eric Lidow.

    Robert  J. Mueller has been employed by  the Company since November 1961. He
served as Vice President of Marketing  for the U.S. Semiconductor Division  from
1963  until October  1969 when  he was  promoted to  Corporate Vice  President -
Foreign  Operations.  Mr.  Mueller  became  Executive  Vice  President  -  World
Marketing  and  Foreign  Operations  in  April  1978,  Corporate  Executive Vice
President - External Affairs and Worldwide Sales in July 1989, and in July  1993
became  Executive Vice President - External Affairs and Business Development. He
was elected a director in 1990.

    Michael P. McGee has been employed by the Company since 1990. He joined  the
Company  in July 1990  as Director of  Corporate Accounting and  was promoted to
Corporate  Controller  in  December  1990.  Mr.  McGee  became  Vice  President,
Controller  and Principal Accounting  Officer in 1991, and  in 1993, became Vice
President - Chief Financial Officer. From 1985 until he joined the Company,  Mr.
McGee was a senior manager and audit manager at Ernst & Young.

    Donald  S. Burns has been Chairman, President and Chief Executive Officer of
Prestige Holdings, Ltd.,  a property  management and  business consulting  firm,
since  1978. Mr. Burns was elected a director of the Company in 1993. He is also
a director of ESI Corporation and International Technology Corporation.

    George Krsek, Ph.D., was President of Houba, Inc. a pharmaceutical firm from
1975 to July  1994, and  is currently President  of Konec  L.L.C., a  management
consulting company. He has been a director of the Company since 1979.

    James  D. Plummer, Ph.D., has been the John M. Fluke Professor of Electrical
Engineering,  Stanford  University  since   1988  and  Director  of   Stanford's
Integrated Circuits Laboratory since 1984. Dr. Plummer was elected a director of
the Company in September 1994.

                                       24
<PAGE>
    Jack  O.  Vance  became  the Managing  Director  of  Management  Research, a
management consulting firm, in  November 1990. From 1960  through 1989 he was  a
director of McKinsey & Co., Inc., a management consulting firm. During the years
1973  through 1989 he was  also the Managing Director  of the firm's Los Angeles
office. He has been a director of the Company since 1988. He is also a  director
of  Hillhaven  Corporation,  International Technology  Corporation,  Escorp, The
Olson Company, University Restaurant Group, and FCG Enterprises, Inc.

    Rochus E. Vogt, Ph.D.,  is a Professor of  Physics, California Institute  of
Technology,  and acted as Provost from 1983 through 1987. He has been a director
of the Company since 1984.

                          DESCRIPTION OF CAPITAL STOCK

    The authorized capital stock of the Company consists of 30,000,000 shares of
Common Stock,  $1.00 par  value per  share, and  1,000,000 shares  of  Preferred
Stock, $1.00 par value per share. No shares of Preferred Stock are outstanding.

COMMON STOCK
    Each  holder of Common Stock is entitled to  one vote for each share held of
record on  each matter  submitted to  a  vote of  shareholders. Subject  to  the
current prohibition in the Company's loan agreements on the payment of dividends
and  to preferences which may be granted to the holders of Preferred Stock, each
holder of  Common  Stock  is  entitled to  share  ratably  in  distributions  to
shareholders  and to receive  ratably such dividends  as may be  declared by the
Board of Directors out of funds legally available therefore and, in the event of
the liquidation, dissolution or winding up of the Company, is entitled to  share
ratably  in all  assets of the  Company remaining after  payment of liabilities.
Holders of  Common Stock  have  no conversion,  preemptive  or other  rights  to
subscribe  for additional shares, and there  are no redemption rights or sinking
fund provisions with respect to the Common Stock.

    The Transfer Agent  and Registrar  for the  Common Stock  is Chemical  Trust
Company of California, Los Angeles, California.

PREFERRED STOCK
    The  Board of  Directors, without  further action  by the  holders of Common
Stock, may issue shares of Preferred Stock in one or more series and may fix  or
alter the rights, preferences, privileges and restrictions, including the voting
rights,  redemption  provisions  (including sinking  fund  provisions), dividend
rights, dividend rates, liquidation preferences  and conversion rights, and  the
description  of and number of shares  constituting any wholly unissued series of
Preferred Stock. The Board of  Directors, without further shareholder  approval,
can  issue  Preferred  Stock  with  voting  and  conversion  rights  which could
adversely affect the voting power of the  holders of Common Stock. No shares  of
Preferred Stock presently are outstanding, and the Company has no plans to issue
shares  of  Preferred Stock.  The issuance  of shares  of Preferred  Stock under
certain circumstances could have the effect  of delaying or preventing a  change
of control or other corporate action.

CHARTER AND BYLAW PROVISIONS
    In  addition to the authorized Preferred  Stock, certain other provisions of
the Company's Certificate of Incorporation and Bylaws may make it more difficult
for a third party to acquire, or may discourage a third party from attempting to
acquire, control of the Company.

    In accordance  with provisions  contained in  the Company's  Certificate  of
Incorporation  and its Bylaws, the Company's  Board of Directors is divided into
three classes with staggered three year terms for each class. The Certificate of
Incorporation and Bylaws provide that the  directors have the right to  increase
(with certain restrictions) or decrease the number of directors. The Certificate
of  Incorporation provides that vacancies for newly created directorships may be
filled by a majority vote of the  remaining directors and removal for cause  may
only be made by the vote of a majority of the outstanding shares.

    Amendment of any of the foregoing provisions of the Company's Certificate of
Incorporation  requires the approval of  the holders of at  least 66 2/3% of the
stock of the Company issued and outstanding having voting power, given at a duly
convened stockholders meeting upon a proposal adopted by the Board.

                                       25
<PAGE>
    Under the Company's Bylaws, a special meeting of stockholders may be  called
only by certain officers or a majority of the Board.

LIMITATION ON DIRECTOR LIABILITY
    In accordance with Section 102(b)(7) of the Delaware General Corporation Law
(the  "DGCL"), the  Company's Certificate  of Incorporation  limits a director's
liability to the Company or its stockholders for monetary damages for breach  of
fiduciary duty to the fullest extent permitted by the DGCL. Section 102(b)(7) of
the  DGCL enables a corporation in its certificate of incorporation to eliminate
or limit  the  personal  liability of  a  director  to the  corporation  or  its
stockholders  for monetary  damages for  violations of  the director's fiduciary
duty, except that a corporation  may not eliminate or  limit the liability of  a
director (i) for any breach of the director's duty of loyalty to the corporation
or  its stockholders,  (ii) for  acts or  omissions not  in good  faith or which
involve intentional misconduct or a knowing violation of law, (iii) pursuant  to
Section  174  of the  DGCL (providing  for liability  of directors  for unlawful
payment of dividends or unlawful stock purchases or redemptions) or (iv) for any
transaction from which the director derived an improper personal benefit.

SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW
    Section 203 of the DGCL prevents  a Delaware corporation from engaging in  a
"Business  Combination" (defined to include a variety of transactions, including
mergers, as set forth below) with an "Interested Stockholder" (generally defined
as a person with 15%  or more of a  corporation's outstanding voting stock)  for
three  years following  the date  such person  became an  Interested Stockholder
unless: (i) before such  person became an Interested  Stockholder, the board  of
directors  of the  corporation approved either  the Business  Combination or the
transaction  in   which  the   Interested  Stockholder   became  an   Interested
Stockholder;   (ii)  upon   consummation  of  the   transaction  the  Interested
Stockholder  owned  at  least  85%  of  the  voting  stock  of  the  corporation
outstanding  at  the time  the transaction  commenced  (excluding stock  held by
directors who are  also officers  and employee  stock ownership  plans in  which
employee  participants do not have the right to determine confidentially whether
shares subject to the plan will be  tendered in a tender or exchange offer);  or
(iii)  on or subsequent  to the date  on which such  person became an Interested
Stockholder, the Business Combination is (x) approved by the board of  directors
of  the  corporation and  (y) authorized  at  a meeting  of stockholders  by the
affirmative vote of  at least 66  2/3% of  the outstanding voting  stock of  the
corporation not owned by the Interested Stockholder.

    Under  Section 203,  the restrictions described  above apply  to the Company
unless, among other things,  (i) by the  affirmative vote of  a majority of  the
shares  entitled  to  vote,  it  adopts  an  amendment  to  its  certificate  of
incorporation or bylaws expressly  electing not to be  governed by Section  203,
(such an amendment would not be effective until 12 months after its adoption and
would not apply to certain Business Combinations); or (ii) a class of its voting
stock  is not (x) listed  on a national securities  exchange, (y) authorized for
quotation  on  an  inter-dealer  quotation  system  of  a  registered   national
securities  association or (z)  held of record by  more than 2,000 stockholders,
(unless any of the foregoing results from action taken, directly or  indirectly,
by  an Interested Stockholder or from a transaction in which a person becomes an
Interested Stockholder).

    A Business  Combination  is  defined in  Section  203  as (i)  a  merger  or
consolidation,  (ii) any sale, lease, mortgage, transfer or other disposition of
assets having an aggregate market value of  10% or more of the aggregate  market
value of either all assets of the corporation determined on a consolidated basis
or all outstanding stock of the corporation; (iii) any transaction which results
in  the  issuance  or  transfer  by  the  corporation,  or  by  certain  of  its
subsidiaries, of any of its stock to the Interested Stockholder, except pursuant
to (x)  the exercise,  exchange  or conversion  of securities  exercisable  for,
exchangeable  for or convertible into stock of the corporation or any subsidiary
which were outstanding prior  to the time the  stockholder became an  Interested
Stockholder  or (y) a transaction  which effects a pro  rata distribution to all
stockholders of the corporation; (iv) any transaction involving the  corporation
or  certain  subsidiaries  thereof  which  has  the  effect  of  increasing  the
proportionate share  of  the  stock  of  any  class  or  series,  or  securities
convertible  into the stock  of any class  or series, of  the corporation or any
such subsidiary  which  is  owned  directly  or  indirectly  by  the  Interested
Stockholder  (except as a  result of immaterial changes  due to fractional share
adjustments  or  any  purchase  or  redemption  not  caused  by  the  Interested
Stockholder);  or (v) any receipt by  the Interested Stockholder of the benefit,
directly  or  indirectly,  (except  proportionately  as  a  stockholder  of  the
corporation)  of any loans, advances or  other financial benefits provided by or
through the corporation.

                                       26
<PAGE>
                                  UNDERWRITING

   
    Under the  terms of  and subject  to the  conditions contained  in the  U.S.
Underwriting  Agreement,  the  form of  which  is  filed as  an  exhibit  to the
Registration Statement of which this  Prospectus forms a part, the  underwriters
of  the offering of the Shares in the  United States and Canada named below (the
"U.S. Underwriters")  for  whom Lehman  Brothers  Inc., Kidder,  Peabody  &  Co.
Incorporated,  Montgomery Securities, PaineWebber  Incorporated and Smith Barney
Inc. are  acting  as  representatives (the  "Representatives"),  have  severally
agreed  to purchase from the Company, and the Company has agreed to sell to each
U.S. Underwriter, the aggregate number of Shares set forth opposite the name  of
each such U.S. Underwriter below:
    

<TABLE>
<CAPTION>
                                                              NUMBER OF
U.S. UNDERWRITERS                                              SHARES
- ------------------------------------------------------------  ---------
<S>                                                           <C>
Lehman Brothers Inc.........................................
Kidder, Peabody & Co. Incorporated..........................
Montgomery Securities.......................................
PaineWebber Incorporated....................................
Smith Barney Inc............................................
                                                              ---------
    Total...................................................  3,600,000
                                                              ---------
                                                              ---------
</TABLE>

   
    Under  the  terms  of  and  subject  to  the  conditions  contained  in  the
International Underwriting Agreement, the form of  which is filed as an  exhibit
to  the Registration Statement of which this  Prospectus is a part, the managers
of the concurrent offering  of the Shares outside  the United States and  Canada
(the  "International  Managers" and  together  with the  U.S.  Underwriters, the
"Underwriters") for whom Lehman Brothers International (Europe), Kidder, Peabody
International PLC, Montgomery Securities, PaineWebber International (U.K.)  Ltd.
and  Smith Barney Inc. are  acting as lead managers  (the "Lead Managers"), have
severally agreed to  purchase from the  Company, and the  Company has agreed  to
sell  to each  International Manager, the  aggregate number of  Shares set forth
opposite the name of each such International Manager below:
    

<TABLE>
<CAPTION>
                                                              NUMBER OF
INTERNATIONAL MANAGERS                                         SHARES
- ------------------------------------------------------------  ---------
<S>                                                           <C>
Lehman Brothers International (Europe)......................
Kidder, Peabody International PLC...........................
Montgomery Securities.......................................
PaineWebber International (U.K.) Ltd........................
Smith Barney Inc............................................
                                                              ---------
    Total...................................................    900,000
                                                              ---------
                                                              ---------
</TABLE>

   
    The  Company  has  been   advised  that  the   U.S.  Underwriters  and   the
International Managers, respectively, propose to offer part of the Shares to the
public  at the public offering price set forth on the cover page hereof and part
to certain dealers  at a price  that represents  a concession not  in excess  of
$       per share under the public offering price. The U.S. Underwriters and the
International Managers may allow, and such dealers may reallow, a concession not
in  excess of $        per share to  certain other brokers or dealers. After the
initial offering to the public, the  offering price and other selling terms  may
be changed by the U.S. Underwriters and International Managers.
    

    The U.S. Underwriting Agreement and the International Underwriting Agreement
(collectively,  the "Underwriting  Agreements") provide that  the obligations of
the several U.S.  Underwriters and  the International  Managers to  pay for  and
accept  delivery of the shares of Common Stock offered pursuant to the Offerings
are subject to  certain conditions  contained therein, and  that if  any of  the
foregoing shares of Common Stock are purchased by the U.S. Underwriters pursuant
to  the U.S. Underwriting Agreement or by the International Managers pursuant to
the International Underwriting Agreement, all the shares of Common Stock  agreed
to  be purchased by either the  U.S. Underwriters or the International Managers,
as the case may be, pursuant  to their respective Underwriting Agreements,  must
be so purchased. The closing

                                       27
<PAGE>
under  the International  Underwriting Agreement is  a condition  to the closing
under  the  U.S.  Underwriting  Agreement,  and  the  closing  under  the   U.S.
Underwriting  Agreement is  a condition to  the closing  under the International
Underwriting Agreement.

    The Company  has granted  to  the U.S.  Underwriters and  the  International
Managers  an option to purchase up to  an aggregate of 675,000 additional shares
of Common Stock at the price to public less the underwriting discount, solely to
cover over-allotments, if any. Such option may be exercised at any time up to 30
days after the date of this Prospectus. To the extent that the U.S. Underwriters
or International Managers exercise such option, each of the U.S. Underwriters or
the International Managers, as  the case may be,  will be committed, subject  to
certain conditions, to purchase a number of Common Stock shares proportionate to
such  U.S.  Underwriter's  or  International  Manager's  initial  commitment  as
indicated in the preceding tables.

   
    The U.S. Underwriters and  the International Managers  have entered into  an
Agreement  Between U.S. Underwriters and  International Managers (the "Agreement
Between U.S. Underwriters and International  Managers"), pursuant to which  each
U.S.  Underwriter has  agreed that,  as part of  the distribution  of the Shares
(plus any of the shares to cover over-allotments) offered in the U.S.  Offering,
(i)  it is not purchasing any such Shares for the account of anyone other than a
U.S. Person (as defined below) and (ii) it has not offered or sold, and will not
offer, sell,  resell or  deliver, directly  or indirectly,  any of  such  Shares
outside  the United States or  Canada or to anyone other  than a U.S. Person. In
addition, pursuant  to such  agreement, each  International Manager  has  agreed
that, as part of the distribution of the Shares (plus any of the shares to cover
over-allotments) offered in the International Offering, (i) it is not purchasing
any  such Shares for the account of a U.S. Person and (ii) it has not offered or
sold, and will not offer, sell,  resell or deliver, directly or indirectly,  any
of  such Shares  in the  United States  or Canada  or to  any U.S.  Person. Each
International Manager has also agreed that it will offer to sell shares only  in
compliance with all relevant requirements of any applicable laws.
    

    The  foregoing limitations do not apply  to stabilization transactions or to
certain other  transactions specified  in the  Underwriting Agreements  and  the
Agreement  Between U.S.  Underwriters and International  Managers, including (i)
certain purchases and sales between the U.S. Underwriters and the  International
Managers, (ii) certain offers, sales, resales, deliveries or distributions to or
through  investment advisors or other  persons exercising investment discretion,
(iii) purchases, offers or sales by a U.S. Underwriter who is also acting as  an
International  Manager or by  an International Manager  who is also  acting as a
U.S. Underwriter and (iv) other  transactions specifically approved by the  U.S.
Underwriters  and International Managers.  As used herein,  (a) the term "United
States" means the United States of America (including District of Columbia)  and
its  territories, its possessions  and other areas  subject to its jurisdiction,
and (b) the  term "U.S.  Person" means  any resident  or citizen  of the  United
States,  any corporation, partnership or other entity created or organized in or
under the laws of the United States or  any estate or trust the income of  which
is  subject to  United States  income taxation regardless  of the  source of its
income (other than  the foreign  branch of any  U.S. Person),  and includes  any
United States branch of a person other than a U.S. Person.

   
    Pursuant  to  the  Agreement  Between  U.S.  Underwriters  and International
Managers, sales may be made between the U.S. Underwriters and the  International
Managers  of such  number of shares  of Common  Stock as may  be mutually agreed
upon. The price of any  shares sold shall be the  public offering price then  in
effect  for Shares  being sold  by the  U.S. Underwriters  and the International
Managers, less  the selling  concession unless  otherwise determined  by  mutual
agreement.  To the extent that there are sales between the U.S. Underwriters and
the International Managers pursuant to  the Agreement Between U.S.  Underwriters
and International Managers, the number of shares initially available for sale by
the  U.S. Underwriters or by the International Managers may be more or less than
the amount appearing on the cover page of this Prospectus.
    

   
    Each International Manager has  represented and agreed that  (i) it has  not
offered  or sold, and will not offer or sell, in the United Kingdom, by means of
any document, any Shares other than (a) to persons whose ordinary business it is
to buy or sell shares or debentures, whether as principal or agent, or (b) under
    

                                       28
<PAGE>
   
circumstances which do not constitute an offer to the public within the  meaning
of  the  Companies Act  1985;  (ii) it  has complied  and  will comply  with all
applicable provisions of the Financial Services  Act 1986 (the "1986 Act")  with
respect  to anything done by it in relation  to the Shares in, from or otherwise
involving the United Kingdom;  and (iii) it  has only issued  or passed on,  and
will  only issue or pass on to any  person in the United Kingdom, any investment
advertisement (within the  meaning of the  1986 Act) relating  to the Shares  if
that  person  falls  within Article  9(3)  of  the Financial  Services  Act 1986
(Investment Advertisements) (exemptions) Order 1988.
    

    No action has been taken or will be taken in any jurisdiction by the Company
or the International Managers that would permit a public offering of the  shares
offered  pursuant to  the Offerings  in any  jurisdiction where  action for that
purpose is required, other than the United States. Persons into whose possession
this Prospectus comes are required by the Company and the International Managers
to inform themselves about and to observe any restrictions as to the offering of
the shares  offered pursuant  to  the Offerings  and  the distribution  of  this
Prospectus.

    Purchasers  of the shares of Common Stock  offered hereby may be required to
pay stamp taxes and other charges in  accordance with the laws and practices  of
the country of purchase in addition to the offering price set forth on the cover
page hereof.

   
    The  Company and each of Alexander, Derek  and Eric Lidow have agreed not to
sell or dispose of any shares of Common Stock, with certain exceptions, prior to
the expiration of 90  days from the  date of this  Prospectus without the  prior
written consent of the U.S. Underwriters and International Managers. The Company
has agreed to indemnify the U.S. Underwriters and International Managers against
certain  liabilities,  including liabilities  under the  Securities Act,  and to
contribute to payments that the U.S. Underwriters and the International Managers
may be required to make in respect hereof.
    

                                 LEGAL OPINIONS

    The validity of the Common Stock to be issued pursuant to the Offerings  and
general corporate legal matters will be passed upon for the Company by O'Melveny
& Myers and for the U.S. Underwriters and the International Managers by Latham &
Watkins.

                                    EXPERTS

   
    The  audited consolidated  financial statements  of the  Company included in
this prospectus,  have been  audited by  Coopers &  Lybrand L.L.P.,  independent
public  accountants, as indicated in their  report with respect thereto, and are
included herein  in reliance  upon  such report,  which include  an  explanatory
paragraph  regarding  three outstanding  class action  lawsuits, given  upon the
authority of said firm as experts in auditing and accounting.
    

                             AVAILABLE INFORMATION

    The Company is subject to  the informational requirements of the  Securities
Exchange  Act  of  1934, as  amended  (the  "Exchange Act")  and,  in accordance
therewith, files reports and other information with the Securities and  Exchange
Commission  (the "Commission"). Reports, proxy  statements and other information
filed by  the  Company may  be  inspected and  copied  at the  public  reference
facilities  maintained by the Commission at  450 Fifth Street, N.W., Washington,
D.C. 20549, as well as  at the following Regional  Offices of the Commission:  7
World  Trade Center, Suite 1300,  New York, New York  10048 and Citicorp Center,
500 West Madison  Street, Suite 1400,  Chicago, Illinois 60661.  Copies of  such
material  may be obtained from the Public Reference Section of the Commission at
450 Fifth  Street,  N.W., Washington,  D.C.  20549, at  prescribed  rates.  Such
material may also be inspected at the offices of the New York Stock Exchange and
the Pacific Stock Exchange.

    This  Prospectus constitutes a part of a Registration Statement filed by the
Company with the Commission under the  Securities Act of 1933, as amended.  This
Prospectus  omits  certain  of  the information  contained  in  the Registration
Statement, and  reference  is hereby  made  to the  Registration  Statement  and

                                       29
<PAGE>
related  exhibits for  further information with  respect to the  Company and the
Common Stock. Any statements contained  herein concerning the provisions of  any
document  are not necessarily complete, and, in each instance, reference is made
to the copy of such document filed  as an exhibit to the Registration  Statement
or  otherwise filed with the Commission. Each such statement is qualified in its
entirety by such reference.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The Company's Annual Report on Form 10-K for the fiscal year ended June  30,
1994,  which  was filed  by  the Company  with  the Commission  pursuant  to the
Exchange Act,  is  hereby incorporated  by  reference in  this  Prospectus.  All
documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or 15(d) of
the  Exchange Act  subsequent to the  date of  this Prospectus and  prior to the
termination of these offerings shall be  deemed to be incorporated by  reference
into this Prospectus and to be a part hereof from the respective dates of filing
of such documents.

    Any statement contained in a document incorporated by reference herein shall
be  deemed to be modified  or superseded for purposes  of this Prospectus to the
extent that a  statement contained  herein or  in any  other subsequently  filed
document  which also is incorporated by  reference herein modifies or supersedes
such statement.  Any such  statement  so modified  or  superseded shall  not  be
deemed,  except  as so  modified or  superseded,  to constitute  a part  of this
Prospectus.

    The Company  will  provide  without  charge to  each  person  to  whom  this
Prospectus  is delivered, upon oral or written request,  a copy of any or all of
the foregoing  documents  incorporated  herein  by  reference,  except  for  the
exhibits  to such documents (unless  such exhibits are specifically incorporated
by reference  into  information  that  this  Prospectus  incorporates).  Written
requests  should be directed to  International Rectifier Corporation, 233 Kansas
Street, El Segundo, California 90245, Attention: Corporate Secretary.  Telephone
requests should be directed to (310) 322-3331.

                                       30
<PAGE>
                                    GLOSSARY

    The  following  are  definitions  of certain  technical  terms  used  in the
Prospectus:

    ASSEMBLY -- The  process of encasing  a semiconductor chip  in a package  to
produce a finished product.

    BIPOLAR TRANSISTOR -- A transistor that is controlled by electrical current.

    CONTROL  IC  -- A  semiconductor device  having logic  or control  and power
handling capability (e.g., a Power MOSFET) on the same chip.

    DIODE -- A discrete device which conducts current in one direction.

    DISCRETE DEVICE --  An electrical  or electronic component  that performs  a
single function.

    FAST  RECOVERY DIODE -- A diode suited to applications above 200 volts where
high switching speed is desirable.

    FET (FIELD  EFFECT  TRANSISTOR)  --  A  transistor  that  is  controlled  by
electrical voltage.

    IGBT  (INSULATED GATE BIPOLAR  TRANSISTOR) -- A variant  of the power MOSFET
that incorporates bipolar transistor technology.

    IC (INTEGRATED CIRCUIT) -- A device  that contains multiple components on  a
single silicon chip to form an electronic circuit.

    PACKAGE -- The external structure that encases a semiconductor chip.

    POWER  MOSFET -- A power field  effect transistor (FET) that is manufactured
using MOS (Metal Oxide Semiconductor) processing technology similar to that used
in manufacturing certain  integrated circuits. The  Company's power MOSFETs  are
sold under the trademark HEXFET.

    POWER  SEMICONDUCTOR -- A  silicon-based component that  operates at a power
level above approximately one watt  and has the ability  both to conduct and  to
block  the flow of electricity. Power semiconductors are used to switch (turn on
and off)  electricity or  to condition  electricity, for  example by  converting
alternating current to direct current.

    RECTIFIER -- A diode used to convert alternating current to direct current.

    SCHOTTKY  DIODE  --  An  ultra-fast  rectifier  for  use  in high-frequency,
low-voltage circuits.

    THYRISTOR (SCR)  --  A four  layer  semiconductor  device that  has  a  gate
structure allowing current to flow in an electrical circuit.

    TRANSISTOR  -- A  semiconductor device that  switches (turns on  and off) or
amplifies electricity in a circuit.

    WAFER FABRICATION --  The sequence  of semiconductor  processing steps  that
creates semiconductor devices on a silicon wafer.

                                       31
<PAGE>
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Report of Independent Accountants..........................................................................        F-2
Consolidated Statement of Operations for the fiscal years ended June 30, 1994, 1993, and 1992 and the three
 month periods ended September 30, 1994 and 1993 (unaudited)...............................................        F-3
Consolidated Balance Sheet as of June 30, 1994 and 1993 and as of September 30, 1994 (unaudited)...........        F-4
Consolidated Statement of Stockholders' Equity for the fiscal years ended June 30, 1994, 1993, and 1992 and
 for the three month period ended September 30, 1994 (unaudited)...........................................        F-5
Consolidated Statement of Cash Flows for the fiscal years ended June 30, 1994, 1993, and 1992 and for the
 three month periods ended September 30, 1994 and 1993 (unaudited).........................................        F-6
Notes to Consolidated Financial Statements.................................................................        F-7
</TABLE>

                                      F-1
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS

The Shareholders and Board of Directors
International Rectifier Corporation

    We  have  audited  the  accompanying  consolidated  financial  statements of
International Rectifier Corporation  and Subsidiaries  as of June  30, 1994  and
1993,  and  for the  fiscal  years ended  June 30,  1994,  1993 and  1992. These
financial statements are  the responsibility  of the  Company's management.  Our
responsibility  is to express an opinion  on these financial statements based on
our audits.

    We conducted  our  audits in  accordance  with generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence  supporting
the  amounts and disclosures in the financial statements. An audit also includes
assessing the  accounting  principles used  and  significant estimates  made  by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion, the financial  statements referred to above present  fairly,
in  all material respects, the  consolidated financial position of International
Rectifier Corporation  and Subsidiaries  at  June 30,  1994  and 1993,  and  the
consolidated  results of  their operations and  their cash flows  for the fiscal
years ended June 30, 1994, 1993 and 1992, in conformity with generally  accepted
accounting principles.

    As   discussed  in  Note  10  to  the  accompanying  consolidated  financial
statements, three class action lawsuits have been filed against the Company  and
its  Board of Directors  (two of whom  are also officers).  The ultimate outcome
thereof cannot  presently  be determined.  Accordingly,  no provisions  for  any
liability  that may result upon  adjudication of these matters  has been made in
the accompanying consolidated financial statements.

COOPERS & LYBRAND

Los Angeles, California
July 26, 1994

                                      F-2
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF OPERATIONS
                      (IN 000'S EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED
                                                            SEPTEMBER 30,
                                                             (UNAUDITED)          FISCAL YEARS ENDED JUNE 30,
                                                         --------------------  ----------------------------------
                                                           1994       1993        1994        1993        1992
                                                         ---------  ---------  ----------  ----------  ----------
<S>                                                      <C>        <C>        <C>         <C>         <C>
Revenues...............................................  $  92,253  $  73,094  $  328,882  $  281,732  $  265,495
Cost of sales..........................................     60,739     49,674     219,944     202,684     186,437
                                                         ---------  ---------  ----------  ----------  ----------
  Gross profit.........................................     31,514     23,420     108,938      79,048      79,058
Selling and administrative expense.....................     18,486     16,350      69,008      62,637      58,771
Research and development expense.......................      4,111      3,810      16,381      14,083       9,405
                                                         ---------  ---------  ----------  ----------  ----------
  Operating profit.....................................      8,917      3,260      23,549       2,328      10,882

Other income (expense):
  Interest expense, net................................       (912)      (760)     (3,625)     (2,250)     (1,436)
  Other, net...........................................       (179)      (194)     (1,050)     (2,675)      1,066
                                                         ---------  ---------  ----------  ----------  ----------
Income (loss) before income taxes......................      7,826      2,306      18,874      (2,597)     10,512
Provision for income taxes (Note 5)....................      1,328        330       3,160         436       1,275
                                                         ---------  ---------  ----------  ----------  ----------
Net income (loss)......................................  $   6,498  $   1,976  $   15,714  $   (3,033) $    9,237
                                                         ---------  ---------  ----------  ----------  ----------
                                                         ---------  ---------  ----------  ----------  ----------
Net income (loss) per share............................      $0.32      $0.10       $0.78      $(0.15)      $0.46
                                                            ------     ------     -------     -------     -------
                                                            ------     ------     -------     -------     -------
Average common and common equivalent shares
 outstanding...........................................     20,596     20,360      20,428      20,087      20,107
                                                          ------     ------     -------     -------     -------
                                                          ------     ------     -------     -------     -------
</TABLE>

         The accompanying notes are an integral part of this statement.

                                      F-3
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
                           CONSOLIDATED BALANCE SHEET
                        (IN 000'S EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                            SEPTEMBER 30,
                                                                                1994        JUNE 30,    JUNE 30,
                                                                             (UNAUDITED)      1994        1993
                                                                            -------------  ----------  ----------
<S>                                                                         <C>            <C>         <C>
                                                     ASSETS
Current assets:
  Cash and cash equivalents...............................................   $    11,610   $   13,051  $    8,545
  Trade accounts receivable, less allowance for doubtful accounts
   ($677 in 1994 and $607 in 1993)........................................        76,071       67,595      55,004
  Inventories.............................................................        75,288       73,429      62,609
  Prepaid expenses........................................................         2,542        2,779       1,731
                                                                            -------------  ----------  ----------
    Total current assets..................................................       165,511      156,854     127,889
Property, plant and equipment, at cost, less accumulated depreciation
 ($112,411 in 1994 and $98,250 in 1993)...................................       167,542      158,567     138,518
Investments and long-term notes receivable................................         2,236        2,248       2,251
Other assets..............................................................        13,200       12,905       9,790
                                                                            -------------  ----------  ----------
    Total assets..........................................................   $   348,489   $  330,574  $  278,448
                                                                            -------------  ----------  ----------
                                                                            -------------  ----------  ----------

                                      LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
  Bank loans (Note 2).....................................................   $    34,853   $   27,205  $   24,007
  Long-term debt, due within one year (Note 2)............................         6,614        6,105       3,532
  Accounts payable........................................................        38,549       36,965      27,846
  Accrued salaries, wages and commissions.................................         8,959       10,264       9,376
  Other accrued expenses..................................................         9,648        9,150       5,012
                                                                            -------------  ----------  ----------
    Total current liabilities.............................................        98,623       89,689      69,773
Long-term debt, less current maturities (Note 2)..........................        28,605       26,817      11,810
Deferred income...........................................................         1,103        1,199       1,402
Other long-term liabilities...............................................         9,238        9,320       9,073
Deferred income taxes (Note 5)............................................           617          606         316
Commitments and contingencies (Notes 7, 8, 9, 10, and 11)
Stockholders' equity (Note 3):
  Common shares, $1 par value, authorized: 30,000,000; issued and
   outstanding: 20,352,277 shares in 1994 and 20,233,802 shares in 1993...        20,392       20,352      20,234
  Preferred shares, $1 par value, authorized: 1,000,000; issued and
   outstanding: none in 1994 and 1993.....................................            --           --          --
  Capital contributed in excess of par value of shares....................       168,508      168,078     167,148
  Retained earnings.......................................................        25,998       19,500       3,786
  Cumulative translation adjustments......................................        (4,595)      (4,987)     (5,094)
                                                                            -------------  ----------  ----------
    Total stockholders' equity............................................       210,303      202,943     186,074
                                                                            -------------  ----------  ----------
    Total liabilities and stockholders' equity............................   $   348,489   $  330,574  $  278,448
                                                                            -------------  ----------  ----------
                                                                            -------------  ----------  ----------
</TABLE>

         The accompanying notes are an integral part of this statement.

                                      F-4
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
                 CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY
                        (IN 000'S EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                               CAPITAL
                                                             CONTRIBUTED
                                                              IN EXCESS
                                                                 OF        RETAINED   CUMULATIVE
                                                    COMMON    PAR VALUE    EARNINGS   TRANSLATION
                                                    SHARES    OF SHARES    (DEFICIT)  ADJUSTMENTS    TOTAL
                                                    -------  -----------   --------   -----------   --------
<S>                                                 <C>      <C>           <C>        <C>           <C>
BALANCE, JUNE 30, 1991............................  $19,810   $164,938     $ (2,418)    $(2,795)    $179,535
Issuance of common shares:
  30,916 -- exercise of stock options.............       31        159           --          --          190
  48,956 -- stock purchase plan...................       49        489           --          --          538
  40,000 -- profit sharing contribution...........       40        184           --          --          224
Stock offering costs..............................       --       (203)          --          --         (203)
Net income for the year ended June 30, 1992.......       --         --        9,237          --        9,237
Cumulative translation adjustments................       --         --           --       2,182        2,182
                                                    -------  -----------   --------   -----------   --------
BALANCE, JUNE 30, 1992............................   19,930    165,567        6,819        (613)     191,703
Issuance of common shares:
  204,640 -- exercise of stock options............      205        992           --          --        1,197
  99,027 -- stock purchase plan...................       99        589           --          --          688
Net loss for the year ended June 30, 1993.........       --         --       (3,033)         --       (3,033)
Cumulative translation adjustments................       --         --           --      (4,481)      (4,481)
                                                    -------  -----------   --------   -----------   --------
BALANCE, JUNE 30, 1993............................   20,234    167,148        3,786      (5,094)     186,074
Issuance of common shares:
  49,410 -- exercise of stock options.............       49        276           --          --          325
  69,065 -- stock purchase plan...................       69        654           --          --          723
Net income for the year ended June 30, 1994.......       --         --       15,714          --       15,714
Cumulative translation adjustments................       --         --           --         107          107
                                                    -------  -----------   --------   -----------   --------
BALANCE, JUNE 30, 1994............................   20,352    168,078       19,500      (4,987)     202,943
Issuance of common shares:
  5,500 -- exercise of stock options..............        5         54           --          --           59
  34,546 -- stock purchase plan...................       35        376           --          --          411
Net income for the three months ended September
 30, 1994.........................................       --         --        6,498          --        6,498
Cumulative translation adjustments................       --         --           --         392          392
                                                    -------  -----------   --------   -----------   --------
BALANCE, SEPTEMBER 30, 1994 (UNAUDITED)...........  $20,392   $168,508     $ 25,998     $(4,595)    $210,303
                                                    -------  -----------   --------   -----------   --------
                                                    -------  -----------   --------   -----------   --------
</TABLE>

         The accompanying notes are an integral part of this statement.

                                      F-5
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                   (IN 000'S)

<TABLE>
<CAPTION>
                                                          THREE MONTHS ENDED
                                                            SEPTEMBER 30,
                                                             (UNAUDITED)           FISCAL YEARS ENDED JUNE 30,
                                                        ----------------------  ----------------------------------
                                                           1994        1993        1994        1993        1992
                                                        ----------  ----------  ----------  ----------  ----------
<S>                                                     <C>         <C>         <C>         <C>         <C>
Cash flow from operating activities:
  Net income (loss)...................................  $    6,498  $    1,976  $   15,714  $   (3,033) $    9,237
  Adjustment to reconcile net income (loss) to net
   cash provided by operating activities:
    Depreciation and amortization.....................       5,365       4,214      18,018      16,524      16,597
    Stock contribution to employee benefit plan.......          --          --          --          --         224
    Deferred income...................................         (95)       (126)       (203)       (513)       (496)
    Deferred income taxes.............................          --         (78)        272        (159)       (248)
    Deferred compensation.............................         165         470       1,473       1,529         978
                                                        ----------  ----------  ----------  ----------  ----------
  Cash flow from operating activities prior to working
   capital requirements...............................      11,933       6,456      35,274      14,348      26,292
  Change in working capital (Note 1)..................      (8,749)     (3,591)     (9,109)      3,943     (19,760)
                                                        ----------  ----------  ----------  ----------  ----------
Net cash provided by operating activities.............       3,184       2,865      26,165      18,291       6,532
                                                        ----------  ----------  ----------  ----------  ----------
Cash flow from investing activities:
  Additions to property, plant and equipment..........     (13,267)     (5,825)    (24,686)    (16,994)    (32,069)
  Investment in other noncurrent assets...............        (709)       (256)     (4,979)     (4,158)     (3,233)
                                                        ----------  ----------  ----------  ----------  ----------
Net cash used in investing activities.................     (13,976)     (6,081)    (29,665)    (21,152)    (35,302)
                                                        ----------  ----------  ----------  ----------  ----------
Cash flow from financing activities:
  Proceeds from issuance of short-term bank debt,
   net................................................       7,403       3,007       2,623       5,333      14,490
  Proceeds from issuance of long-term debt............       3,098       3,038      10,326       2,038       1,734
  Payments on long-term debt and obligations under
   capital leases.....................................      (1,208)       (992)     (5,809)     (5,268)     (7,606)
  Net proceeds from issuance of common stock..........         470         509       1,048       1,885         525
  Other...............................................        (459)       (150)       (125)     (1,201)      4,085
                                                        ----------  ----------  ----------  ----------  ----------
Net cash provided by financing activities.............       9,304       5,412       8,063       2,787      13,228
                                                        ----------  ----------  ----------  ----------  ----------
Effect of exchange rate changes on cash and cash
 equivalents..........................................          47          39         (57)         72        (192)
                                                        ----------  ----------  ----------  ----------  ----------
Net increase (decrease) in cash and cash
 equivalents..........................................      (1,441)      2,235       4,506          (2)    (15,734)
Cash and cash equivalents beginning of year...........      13,051       8,545       8,545       8,547      24,281
                                                        ----------  ----------  ----------  ----------  ----------
Cash and cash equivalents end of year.................  $   11,610  $   10,780  $   13,051  $    8,545  $    8,547
                                                        ----------  ----------  ----------  ----------  ----------
                                                        ----------  ----------  ----------  ----------  ----------
</TABLE>

         The accompanying notes are an integral part of this statement.

                                      F-6
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    PRINCIPLES OF CONSOLIDATION

    The  consolidated financial statements  include the accounts  of the Company
and all its  majority-owned subsidiaries  which are located  in Europe,  Mexico,
Canada, the Far East and South East Asia. All material intercompany transactions
have been eliminated.

    BASIS OF PRESENTATION FOR INTERIM FINANCIALS

    The   consolidated  financial  statements  included  herein  are  unaudited,
however, they contain  all normal recurring  accruals which, in  the opinion  of
management,  are necessary to present fairly the consolidated financial position
of the Company at September 30, 1994 and the consolidated results of  operations
and cash flows for the three month periods ended September 30, 1994 and 1993. It
should  be understood that  accounting measurements at  interim dates inherently
involve greater  reliance  on  estimates  than  at  year  end.  The  results  of
operations  for  the  three  month  period  ended  September  30,  1994  are not
necessarily indicative of the results to be expected for the full year.

    FISCAL YEAR

    Fiscal years 1994 and 1992  consist of 52 weeks ending  July 3 and June  28,
respectively.  Fiscal  year  1993  consists  of  53  weeks  ending  July  4. For
convenience, all references  herein to fiscal  years are to  fiscal years  ended
June 30.

    REVENUE RECOGNITION

    The  Company recognizes revenues from product  sales at the time of shipment
except on certain government contracts  where revenues are recognized using  the
percentage of completion method.

    INVENTORIES

    Inventories   are  stated  at  the  lower  of  cost  (principally  first-in,
first-out) or market. Inventories at June 30, 1994 and 1993, and for the  period
ended September 30, 1994 (unaudited), were comprised of the following (000's):

<TABLE>
<CAPTION>
                                                                                     FISCAL YEARS ENDED
                                                                                          JUNE 30,
                                                               THREE MONTHS ENDED   --------------------
                                                               SEPTEMBER 30, 1994     1994       1993
                                                               -------------------  ---------  ---------
<S>                                                            <C>                  <C>        <C>
Raw materials................................................       $  15,579       $  15,118  $  12,613
Work-in-process..............................................          29,734          26,965     24,943
Finished goods...............................................          29,975          31,346     25,053
                                                                      -------       ---------  ---------
                                                                    $  75,288       $  73,429  $  62,609
                                                                      -------       ---------  ---------
                                                                      -------       ---------  ---------
</TABLE>

    PROPERTY, PLANT AND EQUIPMENT

    Property,  plant and equipment  is stated at cost.  Upon retirement or other
disposal, the asset cost and  related accumulated depreciation are removed  from
the  accounts  and  any gain  or  loss  on disposition  is  included  in income.
Depreciation is provided  on the  straight-line method, based  on the  estimated
useful  lives of the  assets, or the  units of production  method based upon the
estimated output of the  equipment. In the fourth  quarter of fiscal year  1993,
the  Company extended the estimated useful  lives of certain assets. This change
positively impacted 1994 and  1993 pre-tax results  by $2,600,000 and  $200,000,
respectively.

                                      F-7
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
Depreciation  expense for the fiscal  years ended June 30,  1994, 1993, and 1992
was $15,880,000, $14,160,000, and $15,358,000, respectively. Property, plant and
equipment at June 30, 1994 and 1993 was comprised of the following (000's):

<TABLE>
<CAPTION>
                                                                                   1994         1993
                                                                                -----------  -----------
<S>                                                                             <C>          <C>
Buildings and improvements....................................................  $    72,004  $    71,859
Equipment.....................................................................      169,988      140,651
Construction in progress......................................................       22,525       17,795
Less accumulated depreciation.................................................     (112,411)     (98,250)
                                                                                -----------  -----------
                                                                                    152,106      132,055
Land..........................................................................        6,461        6,463
                                                                                -----------  -----------
                                                                                $   158,567  $   138,518
                                                                                -----------  -----------
                                                                                -----------  -----------
</TABLE>

    Depreciation  of  improvements  to  leased  premises  is  provided  on   the
straight-line  method over  the shorter  of the remaining  term of  the lease or
estimated useful lives of the improvements. Capital leases included in property,
plant and equipment at June 30, 1994 and 1993 are as follows (000's):

<TABLE>
<CAPTION>
                                                                                     1994        1993
                                                                                  ----------  ----------
<S>                                                                               <C>         <C>
Equipment.......................................................................  $   62,533  $   51,305
Less accumulated depreciation...................................................     (35,171)    (31,800)
                                                                                  ----------  ----------
                                                                                  $   27,362  $   19,505
                                                                                  ----------  ----------
                                                                                  ----------  ----------
</TABLE>

    FOREIGN CURRENCY TRANSLATION

    The financial position  and results  of operation of  the Company's  foreign
subsidiaries  are measured using the local  currency as the functional currency.
Foreign assets  and liabilities  in  the consolidated  balance sheet  have  been
translated  at the  rate of  exchange on  the balance  sheet date.  Revenues and
expenses are translated at  the average exchange rate  for the year.  Unrealized
translation adjustments do not affect the results of operations and are reported
as  a separate component of stockholders' equity. In fiscal 1994, 1993 and 1992,
the Company recognized foreign currency transaction gains of $376,000, $129,000,
and $376,000, respectively.

    RESEARCH AND DEVELOPMENT

    Research and development costs are expensed as incurred.

    INCOME TAXES

    Deferred income taxes  are determined  based on the  difference between  the
financial  reporting and tax bases of assets and liabilities using enacted rates
in effect during  the year  in which the  differences are  expected to  reverse.
Valuation  allowances  are established  when  necessary to  reduce  deferred tax
assets to the  amount expected to  be realized.  Income tax expense  is the  tax
payable  for the period and the change  during the period in deferred tax assets
and liabilities.

    U.S. income taxes  have not  been provided on  approximately $14,260,000  of
undistributed  earnings of foreign subsidiaries since management considers these
earnings to  be invested  indefinitely or  substantially offset  by foreign  tax
credits.

    EARNINGS PER SHARE

    Earnings  per share is computed by dividing earnings by the weighted average
number of  common  and  common  stock  equivalents  outstanding.  Stock  options
outstanding under stock option plans are considered

                                      F-8
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

1.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
common  stock equivalents. Common stock equivalents for stock options of 112,700
and 244,200 were utilized in the computation  of earnings per share in 1994  and
1992,  respectively. No common stock equivalents  for stock options were used in
1993 as the impact would have been anti-dilutive.

    INTANGIBLE ASSETS

    Patent costs are amortized using the  straight-line method over the life  of
the patent.

    STATEMENT OF CASH FLOWS

    The  Company invests  excess cash from  operations in  short term investment
grade  money  market  funds.  The  Company  considers  all  highly  liquid  debt
instruments  purchased with an original  maturity of three months  or less to be
cash equivalents. Components in the changes in working capital are comprised  of
the following (000's):

<TABLE>
<CAPTION>
                                                                              FISCAL YEARS ENDED
                                                                                   JUNE 30,
                                                  THREE MONTHS ENDED   ---------------------------------
                                                  SEPTEMBER 30, 1994      1994       1993        1992
                                                  -------------------  ----------  ---------  ----------
<S>                                               <C>                  <C>         <C>        <C>
                                                      (UNAUDITED)

Trade accounts receivable, net..................       $  (8,070)      $  (11,701) $  (2,871) $   (8,386)
Inventories.....................................          (1,515)         (10,427)     3,390     (19,333)
Prepaid expenses................................             257           (1,031)      (789)        796
Accounts payable................................           1,431            9,123      4,316       4,710
Accrued salaries, wages and commissions.........          (1,356)             918        243       1,686
Other accrued expenses..........................             504            4,009       (346)        767
                                                         -------       ----------  ---------  ----------
                                                       $  (8,749)      $   (9,109) $   3,943  $  (19,760)
                                                         -------       ----------  ---------  ----------
                                                         -------       ----------  ---------  ----------
</TABLE>

    Supplemental disclosures of cash flow information (000's):

<TABLE>
<CAPTION>
                                                                              1994       1993       1992
                                                                            ---------  ---------  ---------
<S>                                                                         <C>        <C>        <C>
Cash paid during the year for:
  Interest................................................................  $   3,612  $   3,246  $   3,877
  Income taxes............................................................        802      1,376      1,416
Interest capitalized......................................................        453      1,357      1,736
Non cash financing activity:
  Assets acquired through capital leases..................................     12,675      4,275      2,576
</TABLE>

    Included  in assets acquired through capital  leases in 1994 is $7.2 million
in existing operating leases that were renegotiated to capital leases.

    CONCENTRATION OF RISK

    The Company places its temporary  cash investments with high credit  quality
financial  institutions. At times, such investments  may be in excess of insured
limits.

    The Company performs periodic credit evaluations of its customers' financial
condition and generally does not  require collateral. Receivables generally  are
due  in  60  days.  Credit losses  have  consistently  been  within management's
expectations.

    RECLASSIFICATION

    Certain reclassifications have been made  to previously reported amounts  to
conform with the current year presentation.

                                      F-9
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

2.  LONG-TERM DEBT AND OTHER LOANS
    In  June 1994,  the Company  renewed and  modified its  existing $20 million
unsecured credit facility  from Sanwa  Bank California  ("Sanwa Facility").  The
modified facility increases the revolving line of credit to $25 million. In June
1994  the  Company also  added  an unsecured  revolving  credit facility  of $10
million from Wells Fargo Bank. Interest  rates on both facilities are at  prime,
or  the banks costs of  funds plus 1.25%, or LIBOR  plus 1.25% (at the Company's
option). Both facilities expire on October 31, 1996, contain the same  financial
covenants  and ratios, which impact the  availability of funds, and prohibit the
Company from  paying  cash  dividends.  At  June  30,  1994,  $2.5  million  was
outstanding  under  the Sanwa  Facility.  The Company  also  has a  $3.0 million
uncommitted domestic credit facility  of which $1.0  million was outstanding  at
June 30, 1994.

    The  Company also  has an additional  $39.0 million of  credit facilities at
foreign locations. The  interest rate  on these  facilities range  from 3.0%  to
12.25%  at June 30, 1994. Under the terms of the agreements, the availability of
funds is impacted by various financial covenants and collateral requirements. At
June 30, 1994, $23.7 million was outstanding under these foreign facilities.

    Based  on  covenant  and  collateral  limitations  under  the  above  credit
facilities,  the Company had  $26.5 million available for  borrowing at June 30,
1994.

    The following is a summary of  the Company's long-term debt and other  loans
at June 30, 1994 and 1993 (000's):

<TABLE>
<CAPTION>
                                                                                                1994       1993
                                                                                              ---------  ---------
<S>                                                                                           <C>        <C>
Capitalized lease obligations payable in varying monthly installments primarily at rates
 from 6.9% to 16.6%.........................................................................  $  16,115  $   7,543
10.55% property mortgage due in equal monthly installments to 2011..........................      4,300      4,392
Domestic bank loans collateralized by equipment, payable in varying monthly installments at
 rates from 8.0% to 9.0%, due in 1995 through 1999..........................................      3,097        134
Foreign bank loans collateralized by property and/or equipment, payable in varying monthly
 installments at rates from 6.5% to 10.8%, due in 1997 through 2000.........................      4,803      2,873
Foreign unsecured bank loans payable in varying monthly installments at rates from 4.0% to
 11.9%, due in 1998 through 2006............................................................      4,607        400
                                                                                              ---------  ---------
                                                                                                 32,922     15,342
Less current portion of long-term debt......................................................     (6,105)    (3,532)
                                                                                              ---------  ---------
                                                                                              $  26,817  $  11,810
                                                                                              ---------  ---------
                                                                                              ---------  ---------
</TABLE>

    The  net book  value of  properties mortgaged at  June 30,  1994 amounted to
$6,134,000.  Principal  payments  on  long-term   debt  are  as  follows:   1996
$6,458,000;  1997 $6,246,000;  1998 $6,087,000; 1999  $2,769,000; and $5,257,000
thereafter.

    In accordance  with  Statement of  Financial  Accounting Standards  No.  107
"Disclosures  About Fair Value of Financial Instruments," the fair values of the
Company's long-term debt has  been estimated based on  current rates offered  to
the  Company for debt of the same  remaining maturities. The carrying amounts of
the Company's loans approximate their fair values.

3.  CAPITAL STOCK
    The Company has an employee stock  purchase plan. Under this plan  employees
are  allowed to designate between two and ten percent of their base compensation
to purchase shares of the  Company's common stock at  85 percent of fair  market
value.    In   November   1993,   the    stock   purchase   plan   was   amended

                                      F-10
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

3.  CAPITAL STOCK (CONTINUED)
to cover an additional 1,000,000 shares. During fiscal 1994 and 1993, 69,065 and
99,027 shares were  purchased at  an aggregate  purchase price  of $723,000  and
$688,000, respectively. Shares authorized under this plan that remained unissued
were 1,055,003 and 124,068 at June 30, 1994 and 1993, respectively.

    The Company has three stock option plans, the 1979, 1984, and 1992 Plans, as
amended.  Under these plans, options to  purchase shares of the Company's common
stock are issued to key employees as  well as members of the Company's Board  of
Directors.  Options are issued at 100% of the fair value of the Company's common
stock at the date of grant and become exercisable in annual installments of 20%,
beginning on the first anniversary date. The 1992 plan provides for the increase
in options available for grant  under the plan by 1  1/2% of total common  stock
outstanding  on January 1 of each year. On January 1, 1994 and 1993, 304,503 and
300,061 options, respectively, were added to the plan.

    A summary of the status of options  under the 1992, 1984, and 1979 plans  is
as follows:

<TABLE>
<CAPTION>
                                               SHARES         PRICE RANGE
                                              --------    -------------------
<S>                                           <C>         <C>     <C>  <C>
Outstanding, June 30, 1991.................    616,290    $ 4.00  to   $21.62
  Options granted..........................     92,900      8.00  to    19.62
  Options exercised........................    (30,916)     4.00  to    11.50
  Options expired or canceled..............    (15,874)     4.37  to    19.62
                                              --------
Outstanding, June 30, 1992.................    662,400      4.00  to    21.62
  Options granted..........................     73,700      8.00  to    12.50
  Options exercised........................   (204,640)     4.00  to    10.00
  Options expired or canceled..............    (17,650)     4.00  to    12.75
                                              --------
Outstanding, June 30, 1993.................    513,810      4.00  to    21.62
  Options granted..........................    240,000     11.00  to    17.00
  Options exercised........................    (49,410)     4.00  to    15.38
  Options expired or canceled..............    (23,200)     5.75  to    21.62
                                              --------
Outstanding, June 30, 1994 at an average
 price of $13.97...........................    681,200    $ 4.50  to   $21.62
                                              --------
                                              --------
</TABLE>

    The following table summarizes the options exercisable:

<TABLE>
<CAPTION>
                                              SHARES         PRICE RANGE
                                              -------    -------------------
<S>                                           <C>        <C>     <C>  <C>
June 30, 1994..............................   264,120    $ 4.50  to   $21.62
June 30, 1993..............................   216,760      4.00  to    21.62
June 30, 1992..............................   275,900      4.00  to    21.62
</TABLE>

    Additional  information relating  to the  1992, 1984,  and 1979  plans is as
follows:

<TABLE>
<CAPTION>
                                                                         FISCAL YEARS ENDED JUNE 30,
                                                                       --------------------------------
                                                                          1994       1993       1992
                                                                       ----------  ---------  ---------
<S>                                                                    <C>         <C>        <C>
Options available for grant at June 30...............................     350,214    262,511     20,350
Total reserved common stock shares...................................   1,031,414    776,321    682,750
</TABLE>

                                      F-11
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

4.  GEOGRAPHIC SEGMENTS AND FOREIGN OPERATIONS
    The Company operates in one  business segment. Transfers between  geographic
areas  are  made  at  prices reflecting  market  conditions.  Geographic segment
information including sales and transfers between geographic areas is  presented
below:

<TABLE>
<CAPTION>
                                                                         FISCAL YEARS ENDED (000'S)
                                                                     ----------------------------------
                                                                        1994        1993        1992
                                                                     ----------  ----------  ----------
<S>                                                                  <C>         <C>         <C>
Revenues from Unaffiliated Customers
  United States....................................................  $  169,263  $  137,765  $  123,854
  Europe...........................................................      89,073      79,930      83,382
  Other............................................................      70,546      64,037      58,259
                                                                     ----------  ----------  ----------
    Total..........................................................  $  328,882  $  281,732  $  265,495
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
Transfers between Geographic Areas
  United States....................................................  $   97,896  $   84,753  $   87,145
  Europe...........................................................      48,864      56,119      52,150
  Other............................................................       1,379       2,602       5,281
                                                                     ----------  ----------  ----------
    Total..........................................................  $  148,139  $  143,474  $  144,576
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
Total Revenues
  United States....................................................  $  267,159  $  222,518  $  210,999
  Europe...........................................................     137,937     136,049     135,532
  Other............................................................      71,925      66,639      63,540
  Intersegment eliminations........................................    (148,139)   (143,474)   (144,576)
                                                                     ----------  ----------  ----------
    Total..........................................................  $  328,882  $  281,732  $  265,495
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
Operating Profit
  United States....................................................  $   18,173  $    1,108  $    7,285
  Europe...........................................................       4,710         409       2,692
  Other............................................................         666         811         905
                                                                     ----------  ----------  ----------
    Total..........................................................  $   23,549  $    2,328  $   10,882
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
Identifiable Assets
  United States (1)................................................  $  189,591  $  164,485  $  164,778
  Europe...........................................................      74,533      61,364      71,230
  Other............................................................      28,696      22,506      23,297
                                                                     ----------  ----------  ----------
    Total..........................................................  $  292,820  $  248,355  $  259,305
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
U.S. Export Sales to Unaffiliated Customers by Destination of Sale
  Europe...........................................................  $    4,362  $    3,293  $    3,630
  Asia.............................................................      20,094      13,319      10,709
  Other............................................................       4,829       4,057       2,448
                                                                     ----------  ----------  ----------
    Total..........................................................  $   29,285  $   20,669  $   16,787
                                                                     ----------  ----------  ----------
                                                                     ----------  ----------  ----------
<FN>
- ------------------------
(1)  Excluding general corporate assets.
</TABLE>

5.  INCOME TAXES
    Effective  July 1, 1993, the Company  adopted the provisions of Statement of
Financial Accounting Standards ("SFAS") No.  109, "Accounting for Income  Taxes"
which requires recognition of deferred tax

                                      F-12
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

5.  INCOME TAXES (CONTINUED)
assets  and liabilities for  temporary differences and  net operating loss (NOL)
and tax credit  carryforwards. Under  SFAS No.  109, deferred  income taxes  are
established  based on enacted tax rates expected  to be in effect when temporary
differences are scheduled to  reverse and NOL and  tax credit carryforwards  are
expected to be utilized. Adoption of SFAS No. 109 did not have a material impact
on  the Company's  financial position or  results from  operations. Prior year's
financial statements have not been restated.

    The major components of the net deferred  tax liability as of June 30,  1994
and July 1, 1993 were as follows (000's):

<TABLE>
<CAPTION>
                                                                       JUNE 30,      JULY 1,
                                                                         1994         1993
                                                                     ------------  -----------
<S>                                                                  <C>           <C>
Deferred tax liability:
  Depreciation.....................................................   $   (9,215)   $ (10,194)
Deferred tax assets:
  Reserves for books, not deducted.................................        3,380        2,851
  Net operating loss carryovers....................................        9,815       16,765
  Credit carryovers................................................        5,417        5,269
  Other............................................................          593          539
                                                                     ------------  -----------
  Total deferred tax assets........................................       19,205       25,424
  Valuation allowance..............................................      (10,596)     (15,546)
                                                                     ------------  -----------
  Net deferred tax liabilities.....................................   $     (606)   $    (316)
                                                                     ------------  -----------
                                                                     ------------  -----------
</TABLE>

    Income (loss) before income taxes was as follows (000's):

<TABLE>
<CAPTION>
                                                                     FISCAL YEARS ENDED
                                                               -------------------------------
                                                                 1994       1993       1992
                                                               ---------  ---------  ---------
<S>                                                            <C>        <C>        <C>
Operations:
  Domestic...................................................  $  15,626  $  (1,590) $   8,733
  Foreign....................................................      3,248     (1,007)     1,779
                                                               ---------  ---------  ---------
                                                               $  18,874  $  (2,597) $  10,512
                                                               ---------  ---------  ---------
                                                               ---------  ---------  ---------
</TABLE>

    The provision (benefit) for income taxes consisted of (000's):

<TABLE>
<CAPTION>
                                                                          FISCAL YEARS ENDED
                                                                    -------------------------------
                                                                      1994       1993       1992
                                                                    ---------  ---------  ---------
<S>                                                                 <C>        <C>        <C>
Current income taxes:
  Domestic........................................................  $   1,539  $    (122) $     614
  Foreign.........................................................      1,331        788        908
                                                                    ---------  ---------  ---------
                                                                    $   2,870  $     666  $   1,522
                                                                    ---------  ---------  ---------
Deferred income taxes:
  Domestic........................................................         --       (160)        --
  Foreign.........................................................        290        (70)      (247)
                                                                    ---------  ---------  ---------
                                                                          290       (230)      (247)
                                                                    ---------  ---------  ---------
                                                                    $   3,160  $     436  $   1,275
                                                                    ---------  ---------  ---------
                                                                    ---------  ---------  ---------
</TABLE>

    Deferred  taxes  result  primarily from  temporary  differences  relating to
depreciation, inventory valuation and state taxes.

                                      F-13
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

5.  INCOME TAXES (CONTINUED)
    The Company's effective tax  rate on pretax income  (loss) differs from  the
U.S. Federal Statutory tax rate as follows:

<TABLE>
<CAPTION>
                                                          FISCAL YEARS ENDED
                                                     -----------------------------
                                                      1994       1993       1992
                                                     -------    -------    -------
<S>                                                  <C>        <C>        <C>
Statutory tax rate (benefit)......................    35.0%     (34.0)%     34.0%
Utilization of domestic net operating loss
 carryforward.....................................   (36.6)        --      (23.1)
Change in valuation allowance.....................     9.6         --         --
Foreign tax differential..........................     2.6       40.9        0.5
Domestic loss producing no current tax benefit....      --       16.6         --
State taxes, net of federal tax benefit...........     1.5       (7.5)        --
Alternative minimum tax...........................     2.2         --         --
Other, net........................................     2.4        0.8        0.7
                                                     -------    -------    -------
                                                      16.7%      16.8%      12.1%
                                                     -------    -------    -------
                                                     -------    -------    -------
</TABLE>

    At  June  30, 1994,  the  Company had  approximately  $28.8 million  of U.S.
federal income tax net operating loss carryovers which begin to expire in  2004.
During  the  year,  the Company  utilized  approximately $20.4  million  in U.S.
federal  net  operating  loss  carryovers.   The  estimated  tax  benefit   from
utilization of the net operating loss carryover was $6.9 million.

    The  Company has approximately $3.1 million, $1.1 million, and $0.2 million,
respectively, of investment,  research and development,  and foreign tax  credit
carryforwards  which  expire from  1995 to  2001. In  addition, the  Company has
approximately  $0.9  million  of  alternative  minimum  tax  credits  which  are
available to offset future regular tax.

    In  general, Section 382 of the United States Internal Revenue Code includes
provisions which limit the amount of net operating loss carryforwards and  other
tax  attributes that  may be  used annually  in the  event that  a 50% ownership
change (as defined) takes place in any three year period. At June 30, 1994,  the
Company had not experienced a change in ownership for purposes of Section 382.

6.  PROFIT SHARING AND RETIREMENT PLANS
    The  Company  has established  defined contribution  plans for  all eligible
employees. The Profit Sharing and Retirement Plan provides for contributions  by
the  Company in such amounts  as the Board of  Directors may annually determine.
The Company has also established a  voluntary Retirement Savings Plan (401K)  to
which  the  Company  makes  an  annual  contribution  of  up  to  $600  for each
participating employee. Combined plan contributions totaled $841,000,  $511,000,
and  $1,250,000 for fiscal years 1994, 1993, and 1992, respectively. Fiscal year
1992 contributions included 40,000 shares of  the Company's common stock to  its
Profit Sharing and Retirement Plan.

7.  ENVIRONMENTAL MATTERS
    Federal,  state and local  laws and regulations  impose various restrictions
and controls on the discharge of certain materials, chemicals and gases used  in
semiconductor processing. The Company does not believe that compliance with such
laws  and  regulations will  have  a material  adverse  effect on  its financial
position.

    The Company and Rachelle Laboratories, Inc. ("Rachelle"), its pharmaceutical
subsidiary which discontinued operations in 1986, have been named among  several
hundred   entities  as  potentially  responsible   parties  ("PRPs")  under  the
provisions  of  the  Comprehensive  Environmental  Response,  Compensation   and
Liability  Act  of  1980  ("CERCLA"),  in  connection  with  the  United  States
Environmental Protection  Agency's  ("EPA")  investigation of  the  disposal  of
allegedly  hazardous  substances at  a major  superfund  site in  Monterey Park,
California (the "OII site").  Certain PRPs who settled  certain claims with  the
EPA under two

                                      F-14
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

7.  ENVIRONMENTAL MATTERS (CONTINUED)
consent  decrees, filed suit  in Federal Court  in May 1992  against a number of
other PRPs, including IR, for cost  recovery and contribution under CERCLA.  The
lawsuit  against  IR, relating  to  the first  and  second consent  decrees, was
settled in August 1993 for the sum of $40,000 to avoid protracted and  expensive
litigation.  Claims have been  made with the Company's  insurers with respect to
the OII  site matter;  however, there  can be  no assurance  that the  insurance
coverage  attaches to these  claims. There remains  the potential for litigation
against IR relating to future consent decrees. The Company does not believe that
either it or Rachelle  is responsible for  the disposal at the  OII site of  any
material  constituting hazardous substances under  CERCLA. Although the ultimate
resolution of this matter is unknown, the Company believes that it will not have
a material adverse impact on its financial position.

    In May 1993 the Company purchased property from its Employee Profit  Sharing
and  Retirement Plan.  At the time  of the  purchase it was  determined that the
property required  clean up  of seepage  from a  storage tank,  at an  estimated
additional  cost of $500,000. The Company commenced  the clean up in fiscal year
1994, and the costs to  be incurred will be  capitalized as additional costs  of
the property.

    On July 18, 1994, the Company received a letter from the State of Washington
Department  of Ecology  (the "Department") notifying  the Company  of a proposed
finding that the Company is a potentially liable person ("PLP") for alleged  PCE
contamination  (also known as  perchloroethylene, tetrachloroethylene, and other
names) ("PCE") of real  property and groundwater  in Yakima County,  Washington.
The  letter alleges that the  Company arranged for disposal  or treatment of the
PCE or arranged with a transporter for  the disposal or treatment of the PCE  in
Yakima  County. The Company replied on August 11, 1994 to this letter and stated
that it has not contributed to PCE or other solvent contamination at the  Yakima
County  site and that it should not be designated a PLP. On October 11, 1994 the
Company received  a letter  from the  Department notifying  the Company  of  its
finding that the Company is a PLP in the above matter.

    The  Company received a  letter dated September  9, 1994, from  the State of
California Department of Toxic Substances  Control stating that the Company  may
be  a PRP  for the deposit  of hazardous  substances at a  facility in Whittier,
California. The  Company's  investigation of  this  matter has  just  begun  and
therefore an opinion cannot be expressed as to any ultimate responsibility.

8.  COMMITMENTS
    The  future  minimum  lease  commitments  under  non-cancelable  capital and
operating leases of equipment and real property at June 30, 1994 were as follows
(000's):

<TABLE>
<CAPTION>
                                                                     CAPITAL    OPERATING       TOTAL
FISCAL YEARS                                                         LEASES      LEASES      COMMITMENTS
- ------------------------------------------------------------------  ---------  -----------  -------------
<S>                                                                 <C>        <C>          <C>
1995..............................................................  $   5,282   $   6,050     $  11,332
1996..............................................................      4,949       5,272        10,221
1997..............................................................      4,436       4,457         8,893
1998..............................................................      3,880       1,826         5,706
1999..............................................................        977         628         1,605
Later years.......................................................          3       1,208         1,211
Less imputed interest.............................................     (3,412)         --        (3,412)
                                                                    ---------  -----------  -------------
Total minimum lease payment.......................................  $  16,115   $  19,441     $  35,556
                                                                    ---------  -----------  -------------
                                                                    ---------  -----------  -------------
</TABLE>

Total rental expense on all operating  leases charged to income was  $6,723,000,
$5,591,000, and $3,193,000 in fiscal years 1994, 1993 and 1992, respectively.

9.  INTELLECTUAL PROPERTY RIGHTS
    A  competitor, prior to settlement of  patent litigation with the Company in
February 1992, obtained reexamination by the United States Patent and  Trademark
Office ("PTO") of the Company's MOSFET

                                      F-15
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

9.  INTELLECTUAL PROPERTY RIGHTS (CONTINUED)
patents  4,376,286, 4,959,699 and 5,008,725. The PTO confirmed the patentability
of the '725 patent in January 1993 and the '286 patent in July 1993 and the '699
patent in October 1993. In other  reexamination proceedings the PTO in  November
1992  agreed to reexamine the Company's 4,642,666 patent and in July 1993 agreed
to reexamine the Company's 4,705,759 patent. More recently, the PTO on September
12, 1994 agreed to reexamine the Company's 4,642,666 and 4,959,699 patents.  The
patents   subject  to  reexamination  are   fundamental  to  the  Company's  MOS
transistors.

10. LITIGATION
    The Company and  SGS-Thomson Microelectronics, Inc.  ("SGS") are engaged  in
various legal proceedings relating to their respective power MOSFET patents. SGS
filed  suit against the Company in June 1991 in Federal District Court in Texas,
charging infringement of U.S.  patent 4,553,314. On motion  by the Company,  the
suit  was transferred to the Federal  District Court in Los Angeles, California,
and thereafter SGS amended its complaint to charge infringement of U.S.  patents
4,495,513  and 4,712,127.  SGS alleges, in  substance, that  the Company's power
MOSFET and  IGBT products  infringe the  '314 patent,  that the  Company's  IGBT
products  infringe the '513  patent and that certain  packages for IR's products
(including  certain  power  MOSFET  packages)  infringe  the  '127  patent.  The
complaint,  as amended,  seeks unspecified actual  damages (but no  less than an
unspecified reasonable royalty) and an  injunction restraining further sales  of
such  products. On February  1, 1993, the District  Court dismissed SGS's claims
for infringement of the '127 and '513 patents for lack of standing and on  March
15,  1993 ruled  that the  SGS '314 patent  is unenforceable  due to inequitable
conduct. SGS appealed these rulings, as well as the order transferring the  case
to   California,  to  the   Court  of  Appeals  for   the  Federal  Circuit.  IR
cross-appealed a separate ruling by the  District Court denying IR's motion  for
summary  judgment that  the '314  patent is invalid.  In July  1994, the Federal
Circuit reversed the District Court's grants of summary judgment as to the '513,
'127 and '314 patents  and affirmed the District  Court's denial of IR's  motion
for  summary  judgment of  invalidity of  the '314  patent. The  Federal Circuit
ordered, however, that  the case should  proceed in California.  Cross-petitions
for  writs of  certiorari are pending  before the  U.S. Supreme Court  as to the
jurisdictional and venue rulings of the  Federal Circuit. No trial date has  yet
been  set and the  ultimate outcome of the  case as to the  three SGS patents is
unknown.

    In separate proceedings before the same California District Court, IR sought
enforcement of a prior license agreement between  IR and SGS. The Court in  July
1994  granted the Company's  motions to enforce the  license agreement with SGS,
requiring SGS to pay additional past  and prospective royalties under IR's  U.S.
patents  4,959,699 and 4,642,666 on SGS's sales  of power MOSFET, IGBT and power
IC products. SGS has  filed a separate  appeal of this  ruling with the  Federal
Circuit.

    The  Company has  also filed  a separate action  in the  same District Court
against SGS  and its  Italian affiliate,  SGS-Thomson Microelectronics,  S.r.l.,
seeking  an  injunction  against  infringement  of  the  Company's  U.S. patents
5,008,725 and 5,130,767. Trial of the Company's action has been set for  January
25, 1995.

    The  Company,  its  directors  and  certain  officers  have  been  named  as
defendants in three class action lawsuits filed in federal court in  California.
These  suits  seek unspecified  compensatory  and punitive  damages  for alleged
intentional and  negligent  misrepresentations  and violations  of  the  federal
securities laws. They generally allege that the Company and the other defendants
made  materially  false statements  and/or omitted  to  state material  facts in
connection with the public offering of  the Company's common stock completed  on
April  24,  1991  and/or the  redemption  and  conversion in  June  1991  of the
Company's 9% Convertible Subordinated Debentures Due 2010. They also allege that
the Company's projections for growth in fiscal 1992 were materially  misleading.
Although  the Company believes that the claims  alleged in the suits are without
merit, the  ultimate  outcome  cannot be  presently  determined.  A  substantial
judgment or

                                      F-16
<PAGE>
              INTERNATIONAL RECTIFIER CORPORATION AND SUBSIDIARIES
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

10. LITIGATION (CONTINUED)
settlement,  if  any, could  have  a material  adverse  effect on  the Company's
financial condition and  results of  operations. Two  of these  suits also  name
Kidder, Peabody & Co. Incorporated and Montgomery Securities as defendants.

    The Company is currently involved in litigation arising in the normal course
of  business. Management does  not believe that the  ultimate resolution of this
litigation will have a material adverse impact on the financial position of  the
Company (also see Notes 7 and 9).

11. EXECUTIVE AGREEMENT
    The  Company entered into  an executive agreement with  Eric Lidow dated May
15, 1991 providing for his continued employment with the Company for a six  year
period as Chief Executive Officer and President or in such other position as the
Board  of Directors may determine.  Mr. Lidow's salary at  fiscal year end under
this agreement was $550,000. Upon Mr. Lidow's retirement from the Company (or  a
change in control) he will receive annual payments (Founder's Pension) of 90% of
his  then current salary. Upon Mr. Lidow's  death, payments will be continued to
his wife,  if  she  survives him,  in  an  amount equal  to  two-thirds  of  his
retirement  benefits  for the  remainder of  her  life. Under  the terms  of the
Founder's Pension, $572,000, $572,000, and $611,000 have been expensed in fiscal
years 1994, 1993, and 1992, respectively.

12. QUARTERLY FINANCIAL DATA (UNAUDITED)
    Summarized quarterly financial data is  as follows (000's, except per  share
amounts):

<TABLE>
<CAPTION>
                                                                                               NET
                                                                  GROSS         NET       INCOME (LOSS)
                                                     REVENUES    PROFIT    INCOME (LOSS)    PER SHARE
                                                     ---------  ---------  -------------  -------------
<S>                                                  <C>        <C>        <C>            <C>
1994
- ---------------------------------------------------
1st Quarter........................................  $  73,094  $  23,420    $   1,976      $    0.10
2nd Quarter........................................     79,104     25,613        3,070           0.15
3rd Quarter........................................     84,252     28,110        4,206           0.21
4th Quarter........................................     92,432     31,795        6,462           0.32

1993
- ---------------------------------------------------
1st Quarter........................................  $  64,980  $  16,937    $  (1,878)     $   (0.09)
2nd Quarter........................................     70,452     19,417       (1,993)         (0.10)
3rd Quarter........................................     70,572     20,513          125           0.01
4th Quarter........................................     75,728     22,181          713           0.04
</TABLE>

                                      F-17
<PAGE>
                           [INSIDE BACK COVER PHOTO]

[PHOTO2]
   
Daytime aerial photo of International Rectifier's HEXFET America site.
    

[CAPTION]
   
HEXFET   America,  International  Rectifier's  principal  power  MOS  transistor
fabrication and  assembly facility  in  Temecula, California,  processes  wafers
using  linear flow manufacturing  similar to a  production line for automobiles.
In-line production  sharply  reduces  manufacturing  cycle  time  and  inventory
requirements.
    

   
To  meet rising demand  for power MOSFETs and  IGBTs, International Rectifier is
planning to increase  the plant's  wafer fabrication  capacity by  approximately
75%.  The expansion is now in progress,  and additional capacity is scheduled to
be in production by the end of calendar 1995.
    
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

    NO  DEALER, SALESPERSON OR ANY OTHER PERSON  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO  MAKE ANY  REPRESENTATIONS NOT CONTAINED  IN THIS  PROSPECTUS,
AND,  IF GIVEN OR MADE,  SUCH INFORMATION OR REPRESENTATIONS  MUST NOT BE RELIED
UPON  AS  HAVING  BEEN  AUTHORIZED  BY  THE  COMPANY  OR  BY  ANY  OF  THE  U.S.
UNDERWRITERS.  THIS PROSPECTUS  DOES NOT CONSTITUTE  AN OFFER  OF ANY SECURITIES
OTHER THAN THOSE TO WHICH IT RELATES OR  AN OFFER TO SELL, OR A SOLICITATION  OF
AN  OFFER TO  BUY, TO  ANY PERSON  IN ANY  JURISDICTION WHERE  SUCH AN  OFFER OR
SOLICITATION WOULD BE UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR  ANY
SALE  MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT
THE INFORMATION CONTAINED  HEREIN IS CORRECT  AS OF ANY  TIME SUBSEQUENT TO  THE
DATE HEREOF.

                             ---------------------

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                        Page
                                                         ---
<S>                                                  <C>
Prospectus Summary.................................           3
The Company........................................           5
Risk Factors.......................................           5
Use of Proceeds....................................           8
Capitalization.....................................           8
Price Range of Common Stock........................           9
Dividend Policy....................................           9
Selected Consolidated Financial Data...............          10
Management's Discussion and Analysis of Financial
  Condition and Results of Operations..............          12
Business...........................................          15
Management.........................................          24
Description of Capital Stock.......................          25
Underwriting.......................................          27
Legal Opinions.....................................          29
Experts............................................          29
Available Information..............................          29
Incorporation of Certain Documents by Reference....          30
Glossary...........................................          31
Index to Consolidated Financial Statements.........         F-1
</TABLE>

                                4,500,000 SHARES

                                     [LOGO]

                                 INTERNATIONAL
                                   RECTIFIER
                                  CORPORATION

                                  COMMON STOCK

                              -------------------

                                   PROSPECTUS
                                          , 1994

                             ---------------------

                                LEHMAN BROTHERS

                             KIDDER, PEABODY & CO.
                                  INCORPORATED

                             MONTGOMERY SECURITIES

                            PAINEWEBBER INCORPORATED

                               SMITH BARNEY INC.

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
INFORMATION   CONTAINED  HEREIN  IS  SUBJECT   TO  COMPLETION  OR  AMENDMENT.  A
REGISTRATION STATEMENT  RELATING TO  THESE SECURITIES  HAS BEEN  FILED WITH  THE
SECURITIES  AND EXCHANGE  COMMISSION. THESE SECURITIES  MAY NOT BE  SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR  TO THE TIME THE REGISTRATION STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE AN  OFFER  TO  SELL  OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN  ANY STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                [ALTERNATE SECTION FOR INTERNATIONAL PROSPECTUS]

                 Subject to Completion, dated October 28, 1994
PROSPECTUS
                                4,500,000 SHARES
                                     [LOGO]
                      INTERNATIONAL RECTIFIER CORPORATION
                                  COMMON STOCK
                                ----------------

   
    All of the 4,500,000 shares of Common Stock, par value $1.00 per share  (the
"Shares"),  offered hereby are being sold by International Rectifier Corporation
("IR" or  the "Company").  Of  the 4,500,000  shares  of Common  Stock  offered,
900,000 shares will be offered initially outside the United States and Canada by
the  International Managers (the "International  Offering") and 3,600,000 shares
will be  offered  concurrently in  the  United States  and  Canada by  the  U.S.
Underwriters (the "U.S. Offering" and, together with the International Offering,
the  "Offerings"). The offering price and underwriting discounts and commissions
for the U.S.  Offering and  the International  Offering will  be identical.  See
"Underwriting."
    

   
    The  Company's Common Stock is listed on the New York Stock Exchange and the
Pacific Stock Exchange under the symbol "IRF." On October 27, 1994, the  closing
price  for the Company's Common  Stock on the New  York Stock Exchange Composite
Tape was  $23.625 per  share. See  "Price  Range of  Common Stock  and  Dividend
Policy."
    
                             ---------------------

    SEE "RISK FACTORS" FOR CERTAIN MATTERS RELEVANT TO AN INVESTMENT IN THE
                            COMPANY'S COMMON STOCK.
                             ---------------------

THESE  SECURITIES  HAVE  NOT  BEEN APPROVED  OR  DISAPPROVED  BY  THE SECURITIES
    AND EXCHANGE  COMMISSION  OR ANY  STATE  SECURITIES COMMISSION  NOR  HAS
       THE    SECURITIES   AND   EXCHANGE   COMMISSION   OR   ANY   STATE
           SECURITIES  COMMISSION   PASSED  UPON   THE  ACCURACY   OR
              ADEQUACY  OF  THIS  PROSPECTUS.  ANY  REPRESENTATION
                      TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
                                                                Underwriting
                                                                 Discounts
                                               Price                and             Proceeds to
                                             to Public        Commissions (1)       Company (2)
<S>                                      <C>                 <C>                 <C>
Per Share..............................  $                   $                   $
Total (3)..............................  $                   $                   $
<FN>
(1)  The Company has agreed to indemnify the International Managers and the U.S.
     Underwriters against certain liabilities,  including liabilities under  the
     Securities Act of 1933, as amended. See "Underwriting."
(2)  Before  deducting estimated expenses of the Offerings of $          payable
     to the Company.
(3)  The  Company  has   granted  the  International   Managers  and  the   U.S.
     Underwriters a 30-day option to purchase up to 675,000 additional shares of
     Common  Stock on the same terms and conditions as set forth above solely to
     cover over-allotments, if  any. If such  option is exercised  in full,  the
     total  Price to Public, Underwriting Discounts and Commissions and Proceeds
     to Company will be $          , $           and $          ,  respectively.
     See "Underwriting."
</TABLE>

                             ---------------------

   
    The  shares of Common  Stock offered by  this Prospectus are  offered by the
International Managers subject  to prior  sale, to  withdrawal, cancellation  or
modification  of the offer without notice, to  delivery to and acceptance by the
International Managers and to  certain further conditions.  It is expected  that
delivery  of the Shares will be made at the offices of Lehman Brothers Inc., New
York, New York, on or about            , 1994.
    
                             ---------------------

LEHMAN BROTHERS

               KIDDER, PEABODY INTERNATIONAL PLC

                              MONTGOMERY SECURITIES

                                             PAINEWEBBER INTERNATIONAL

                                                               SMITH BARNEY INC.

              , 1994
<PAGE>
                [ALTERNATE SECTION FOR INTERNATIONAL PROSPECTUS]

               CERTAIN UNITED STATES FEDERAL TAX CONSEQUENCES TO
                           NON-UNITED STATES HOLDERS

    The following  is a  general  discussion of  certain United  States  federal
income tax consequences of the ownership and disposition of the shares of Common
Stock  by a holder who, for United States  federal income tax purposes, is not a
United States person (a  "Non-United States Holder") who  holds such stock as  a
capital  asset. For  these purposes, "United  States person" means  a citizen or
resident of  the  United States,  a  corporation, partnership  or  other  entity
created  or organized in or under the laws of the United States or any political
subdivision thereof, or  an estate or  trust whose income  is subject to  United
States  federal income tax regardless of its source. This discussion is based on
current provisions of the  Internal Revenue Code of  1986, as amended,  existing
and  proposed regulations promulgated thereunder and administrative and judicial
interpretations thereof,  all  of which  are  subject to  change  possibly  with
retroactive effect. This discussion is for general information only and does not
consider  all  specific  facts  and  circumstances that  may  be  relevant  to a
particular holder's  tax position.  Each Non-United  States Holder  is urged  to
consult its own tax adviser with respect to the United States federal income tax
consequences  of owning and disposing of shares  of Common Stock, as well as any
tax consequences that  may arise under  the laws of  any state, municipality  or
other taxing jurisdiction.

    DIVIDENDS.   Dividends paid  on shares of Common  Stock to Non-United States
Holders generally will be subject to withholding of United States federal income
tax at the  rate of 30  percent, subject  to a reduction  for Non-United  States
Holders eligible for the benefits of an applicable tax treaty. In the event that
the  dividend is effectively connected  with the conduct of  a trade or business
within the  United States  by the  Non-United States  Holder, the  dividend  (as
adjusted  by  any applicable  deductions) will  generally  be subject  to United
States federal income tax at  regular graduated rates (if certain  certification
and  disclosure requirements are met) instead  of the 30 percent withholding tax
described above. Any such effectively connected dividends received by a  foreign
corporation  may also, under certain circumstances,  be subject to an additional
"branch profits tax" at a 30% rate or such lower rate as may be specified by  an
applicable  income tax treaty.  Holders that are partnerships  and trusts may be
subject to certain additional withholding requirements and are urged to  consult
their  tax advisers  as to  the applicability  of such  requirements. Non-United
States Holders may be required to comply with certain certification requirements
in order to claim treaty benefits or to be exempt from withholding.

    The Company must report annually to the Internal Revenue Service and to each
Non-United States Holder  the amount  of dividends  paid and  tax withheld  with
respect  to  shares  of Common  Stock  held  by such  holder.  These information
reporting requirements apply  regardless of whether  withholding was reduced  or
eliminated  by  an applicable  tax  treaty. This  information  may also  be made
available by the Internal Revenue Service  to tax authorities of the country  in
which the Non-United States Holder resides.

    Under  current  U.S.  Treasury  regulations, dividends  paid  to  an address
outside the United States are presumed to be paid to a resident of such  country
for  purposes of the withholding discussed above (unless the payor has knowledge
to the  contrary),  and,  under  the current  interpretation  of  U.S.  Treasury
regulations, for purposes of determining the applicability of a tax treaty rate.
These  rules are  currently being  studied by  the Internal  Revenue Service and
Treasury Department  and  may  be  changed in  the  future  to  require  certain
additional certifications by a non-U.S. Holder of Common Stock.

    GAIN ON DISPOSITION.  Any gain recognized upon a disposition of Common Stock
by  a Non-United States  Holder will generally  not be subject  to United States
federal income tax unless (i) the gain is effectively connected with the conduct
of a trade or business within the United States of the Non-United States  Holder
or,  if  a  tax  treaty  applies,  attributable  to  a  permanent  establishment
maintained by the Non-United States Holder or (ii) the Non-United States  Holder
is an individual who holds the Common Stock as a capital asset and is present in
the  United States for 183  days or more in the  taxable year of the disposition
and either (a) such  individual has a  "tax home" (as  defined for U.S.  federal
income  tax purposes) in the United States or (b) the gain is attributable to an
office or other fixed place of business maintained in the United States by  such
individual.  If an  individual Non-United States  Holder falls  under clause (i)
above, he or she  will be taxed  on his or  her net gain  derived from the  sale
under  regular  graduated  U.S.  federal income  tax  rates.  If  the individual
Non-United States  Holder falls  under clause  (ii)  above, he  or she  will  be
subject to

                                       27
<PAGE>
                [ALTERNATE SECTION FOR INTERNATIONAL PROSPECTUS]
a  flat 30% tax on  the gain derived from  the sale which may  be offset by U.S.
capital losses (notwithstanding  the fact  that he or  she is  not considered  a
resident  of the United States). Thus,  individual Non-United States Holders who
have spent 183 days or  more in the United States  in the taxable year in  which
they  contemplate a  sale of  the Common  Stock are  urged to  consult their tax
advisers as to the tax consequences of such sale. If a Non-United States  Holder
that  is a foreign corporation falls under clause (i) above, it will be taxed on
its gain under regular graduated U.S. federal income tax rates and, in addition,
may be  subject to  the branch  profits tax  equal to  30% of  its  "effectively
connected  earnings and profits" within the meaning  of the Code for the taxable
year, as adjusted for certain items, unless it qualifies for a lower rate  under
an  applicable  income  tax treaty.  The  foregoing  treatment is  based  on the
Company's belief that  it does  not constitute  a "United  States real  property
holding  corporation" for United States income  tax purposes. However, there can
be no assurance that the Company will not be so characterized in the future.

    ESTATE TAX.  Shares of Common Stock held by an individual Non-United  States
Holder  at the time  of his death will  be subject to  the United States federal
estate tax imposed  on the estates  of nonresident  aliens in the  absence of  a
contrary provision in an applicable estate tax treaty.

BACKUP WITHHOLDING AND INFORMATION REPORTING

    DIVIDENDS.   Dividends that are  subject to U.S. withholding  tax at the 30%
statutory rate  or  at  a  reduced  tax  treaty  rate  and  dividends  that  are
effectively  connected with  the conduct  of a trade  or business  in the United
States (if certain certification and disclosure requirements are met) are exempt
from  backup  withholding  of  U.S.  federal  income  tax.  In  general,  backup
withholding  at a  rate of  31% and  information reporting  will apply  to other
dividends paid  on  shares of  Common  Stock to  holders  that are  not  "exempt
recipients"  and  fail to  provide in  the  manner required  certain identifying
information (such  as the  holder's name,  address and  taxpayer  identification
number).  Generally, individuals are not exempt recipients, whereas corporations
and certain other entities generally are exempt recipients.

    DISPOSITION OF COMMON STOCK.   Information reporting and backup  withholding
imposed  at a rate of 31% will apply  to the proceeds of a disposition of Common
Stock paid to or through a U.S.  office of a broker unless the disposing  holder
certifies  its non-U.S. status or otherwise establishes an exemption. Generally,
U.S. information reporting and backup withholding will not apply to a payment of
disposition proceeds if the payment is made outside the United States through  a
non-U.S.  office  of  a  non-U.S. broker.  However,  U.S.  information reporting
requirements (but not backup withholding) will apply to a payment of disposition
proceeds outside the United States if (A) the payment is made through an  office
outside  the United States of a broker that  is either (i) a U.S. person, (ii) a
foreign person which derives 50% or more of its gross income for certain periods
from the  conduct of  a  trade or  business  in the  United  States or  (iii)  a
"controlled  foreign corporation" for  U.S. federal income  tax purposes and (B)
the broker fails to maintain documentary evidence that the holder is a  non-U.S.
holder  and that  certain conditions  are met, or  that the  holder otherwise is
entitled to an exemption.

    Backup withholding is not  an additional tax. Rather,  the tax liability  of
persons  subject to  backup withholding  will be  reduced by  the amount  of tax
withheld. If withholding  results in an  overpayment of taxes,  a refund may  be
obtained,  provided  that  the required  information  is furnished  to  the U.S.
Internal Revenue Service.

    These information  and backup  withholding  rules are  under review  by  the
United  States Treasury. Their  application to the  ownership and disposition of
shares of Common Stock could be changed prospectively by future regulations.

                                       28
<PAGE>
                                  UNDERWRITING

   
    Under  the terms  of and  subject to  the conditions  contained in  the U.S.
Underwriting Agreement,  the  form  of which  is  filed  as an  exhibit  to  the
Registration  Statement of which this Prospectus  forms a part, the underwriters
of the offering of the Shares in  the United States and Canada named below  (the
"U.S.  Underwriters")  for  whom Lehman  Brothers  Inc., Kidder,  Peabody  & Co.
Incorporated, Montgomery Securities, PaineWebber  Incorporated and Smith  Barney
Inc.  are  acting  as representatives  (the  "Representatives"),  have severally
agreed to purchase from the Company, and the Company has agreed to sell to  each
U.S.  Underwriter, the aggregate number of Shares set forth opposite the name of
each such U.S. Underwriter below:
    

<TABLE>
<CAPTION>
                                                              NUMBER OF
U.S. UNDERWRITERS                                              SHARES
- ------------------------------------------------------------  ---------
<S>                                                           <C>
Lehman Brothers Inc.........................................
Kidder, Peabody & Co. Incorporated..........................
Montgomery Securities.......................................
PaineWebber Incorporated....................................
Smith Barney Inc............................................
                                                              ---------
    Total...................................................  3,600,000
                                                              ---------
                                                              ---------
</TABLE>

   
    Under  the  terms  of  and  subject  to  the  conditions  contained  in  the
International  Underwriting Agreement, the form of  which is filed as an exhibit
to the Registration Statement of which  this Prospectus is a part, the  managers
of  the concurrent offering of  the Shares outside the  United States and Canada
(the "International  Managers"  and together  with  the U.S.  Underwriters,  the
"Underwriters") for whom Lehman Brothers International (Europe), Kidder, Peabody
International  PLC, Montgomery Securities, PaineWebber International (U.K.) Ltd.
and Smith Barney Inc.  are acting as lead  managers (the "Lead Managers"),  have
severally  agreed to purchase  from the Company,  and the Company  has agreed to
sell to each  International Manager, the  aggregate number of  Shares set  forth
opposite the name of each such International Manager below:
    

<TABLE>
<CAPTION>
                                                              NUMBER OF
INTERNATIONAL MANAGERS                                         SHARES
- ------------------------------------------------------------  ---------
<S>                                                           <C>
Lehman Brothers International (Europe)......................
Kidder, Peabody International PLC...........................
Montgomery Securities.......................................
PaineWebber International (U.K.) Ltd........................
Smith Barney Inc............................................
                                                              ---------
    Total...................................................    900,000
                                                              ---------
                                                              ---------
</TABLE>

   
    The   Company  has  been   advised  that  the   U.S.  Underwriters  and  the
International Managers, respectively, propose to offer part of the Shares to the
public at the public offering price set forth on the cover page hereof and  part
to  certain dealers  at a price  that represents  a concession not  in excess of
$       per share under the public offering price. The U.S. Underwriters and the
International Managers may allow, and such dealers may reallow, a concession not
in excess of $        per share to  certain other brokers or dealers. After  the
initial  offering to the public, the offering  price and other selling terms may
be changed by the U.S. Underwriters and International Managers.
    

    The U.S. Underwriting Agreement and the International Underwriting Agreement
(collectively, the "Underwriting  Agreements") provide that  the obligations  of
the  several U.S.  Underwriters and  the International  Managers to  pay for and
accept delivery of the shares of Common Stock offered pursuant to the  Offerings
are  subject to  certain conditions  contained therein, and  that if  any of the
foregoing shares of Common Stock are purchased by the U.S. Underwriters pursuant
to the U.S. Underwriting Agreement or by the International Managers pursuant  to
the  International Underwriting Agreement, all the shares of Common Stock agreed
to be purchased by either the  U.S. Underwriters or the International  Managers,
as  the case may be, pursuant  to their respective Underwriting Agreements, must
be so purchased. The closing

                                       29
<PAGE>
under the International  Underwriting Agreement  is a condition  to the  closing
under   the  U.S.  Underwriting  Agreement,  and  the  closing  under  the  U.S.
Underwriting Agreement is  a condition  to the closing  under the  International
Underwriting Agreement.

    The  Company  has granted  to the  U.S.  Underwriters and  the International
Managers an option to purchase up  to an aggregate of 675,000 additional  shares
of Common Stock at the price to public less the underwriting discount, solely to
cover over-allotments, if any. Such option may be exercised at any time up to 30
days after the date of this Prospectus. To the extent that the U.S. Underwriters
or International Managers exercise such option, each of the U.S. Underwriters or
the  International Managers, as the  case may be, will  be committed, subject to
certain conditions, to purchase a number of Common Stock shares proportionate to
such  U.S.  Underwriter's  or  International  Manager's  initial  commitment  as
indicated in the preceding tables.

   
    The  U.S. Underwriters and  the International Managers  have entered into an
Agreement Between U.S. Underwriters  and International Managers (the  "Agreement
Between  U.S. Underwriters and International  Managers"), pursuant to which each
U.S. Underwriter has  agreed that,  as part of  the distribution  of the  Shares
(plus  any of the shares to cover over-allotments) offered in the U.S. Offering,
(i) it is not purchasing any such Shares for the account of anyone other than  a
U.S. Person (as defined below) and (ii) it has not offered or sold, and will not
offer,  sell,  resell or  deliver, directly  or indirectly,  any of  such Shares
outside the United States or  Canada or to anyone other  than a U.S. Person.  In
addition,  pursuant  to such  agreement, each  International Manager  has agreed
that, as part of the distribution of the Shares (plus any of the shares to cover
over-allotments) offered in the International Offering, (i) it is not purchasing
any such Shares for the account of a U.S. Person and (ii) it has not offered  or
sold,  and will not offer, sell, resell  or deliver, directly or indirectly, any
of such  Shares in  the United  States or  Canada or  to any  U.S. Person.  Each
International  Manager has also agreed that it will offer to sell shares only in
compliance with all relevant requirements of any applicable laws.
    

    The foregoing limitations do not  apply to stabilization transactions or  to
certain  other  transactions specified  in the  Underwriting Agreements  and the
Agreement Between U.S.  Underwriters and International  Managers, including  (i)
certain  purchases and sales between the U.S. Underwriters and the International
Managers, (ii) certain offers, sales, resales, deliveries or distributions to or
through investment advisors or  other persons exercising investment  discretion,
(iii)  purchases, offers or sales by a U.S. Underwriter who is also acting as an
International Manager or  by an International  Manager who is  also acting as  a
U.S.  Underwriter and (iv) other transactions  specifically approved by the U.S.
Underwriters and International Managers.  As used herein,  (a) the term  "United
States"  means the United States of America (including District of Columbia) and
its territories, its possessions  and other areas  subject to its  jurisdiction,
and  (b) the  term "U.S.  Person" means  any resident  or citizen  of the United
States, any corporation, partnership or other entity created or organized in  or
under  the laws of the United States or  any estate or trust the income of which
is subject to  United States  income taxation regardless  of the  source of  its
income  (other than  the foreign  branch of any  U.S. Person),  and includes any
United States branch of a person other than a U.S. Person.

   
    Pursuant to  the  Agreement  Between  U.S.  Underwriters  and  International
Managers,  sales may be made between the U.S. Underwriters and the International
Managers of such  number of shares  of Common  Stock as may  be mutually  agreed
upon.  The price of any  shares sold shall be the  public offering price then in
effect for Shares  being sold  by the  U.S. Underwriters  and the  International
Managers,  less  the selling  concession unless  otherwise determined  by mutual
agreement. To the extent that there are sales between the U.S. Underwriters  and
the  International Managers pursuant to  the Agreement Between U.S. Underwriters
and International Managers, the number of shares initially available for sale by
the U.S. Underwriters or by the International Managers may be more or less  than
the amount appearing on the cover page of this Prospectus.
    

   
    Each  International Manager has  represented and agreed that  (i) it has not
offered or sold, and will not offer or sell, in the United Kingdom, by means  of
any document, any Shares other than (a) to persons whose ordinary business it is
to buy or sell shares or debentures, whether as principal or agent, or (b) under
    

                                       30
<PAGE>
   
circumstances  which do not constitute an offer to the public within the meaning
of the  Companies Act  1985;  (ii) it  has complied  and  will comply  with  all
applicable  provisions of the Financial Services  Act 1986 (the "1986 Act") with
respect to anything done by it in  relation to the Shares in, from or  otherwise
involving  the United Kingdom;  and (iii) it  has only issued  or passed on, and
will only issue or pass on to  any person in the United Kingdom, any  investment
advertisement  (within the meaning  of the 1986  Act) relating to  the Shares if
that person  falls  within Article  9(3)  of  the Financial  Services  Act  1986
(Investment Advertisements) (exemptions) Order 1988.
    

    No action has been taken or will be taken in any jurisdiction by the Company
or  the International Managers that would permit a public offering of the shares
offered pursuant to  the Offerings  in any  jurisdiction where  action for  that
purpose is required, other than the United States. Persons into whose possession
this Prospectus comes are required by the Company and the International Managers
to inform themselves about and to observe any restrictions as to the offering of
the  shares  offered pursuant  to  the Offerings  and  the distribution  of this
Prospectus.

    Purchasers of the shares of Common  Stock offered hereby may be required  to
pay  stamp taxes and other charges in  accordance with the laws and practices of
the country of purchase in addition to the offering price set forth on the cover
page hereof.

   
    The Company and each of Alexander, Derek  and Eric Lidow have agreed not  to
sell or dispose of any shares of Common Stock, with certain exceptions, prior to
the  expiration of 90  days from the  date of this  Prospectus without the prior
written consent of the U.S. Underwriters and International Managers. The Company
has agreed to indemnify the U.S. Underwriters and International Managers against
certain liabilities,  including liabilities  under the  Securities Act,  and  to
contribute to payments that the U.S. Underwriters and the International Managers
may be required to make in respect hereof.
    

                                 LEGAL OPINIONS

    The  validity of the Common Stock to be issued pursuant to the Offerings and
general corporate legal matters will be passed upon for the Company by O'Melveny
& Myers and for the U.S. Underwriters and the International Managers by Latham &
Watkins.

                                    EXPERTS

    The audited consolidated  financial statements  of the  Company included  in
this  prospectus, have  been audited  by Coopers  & Lybrand  L.L.P., independent
public accountants, as indicated in their  report with respect thereto, and  are
included  herein  in reliance  upon such  report,  which include  an explanatory
paragraph regarding  three outstanding  class action  lawsuits, given  upon  the
authority of said firm as experts in auditing and accounting.

                             AVAILABLE INFORMATION

    The  Company is subject to the  informational requirements of the Securities
Exchange Act  of  1934, as  amended  (the  "Exchange Act")  and,  in  accordance
therewith,  files reports and other information with the Securities and Exchange
Commission (the "Commission"). Reports,  proxy statements and other  information
filed  by  the Company  may  be inspected  and  copied at  the  public reference
facilities maintained by the Commission  at 450 Fifth Street, N.W.,  Washington,
D.C.  20549, as well as  at the following Regional  Offices of the Commission: 7
World Trade Center, Suite  1300, New York, New  York 10048 and Citicorp  Center,
500  West Madison  Street, Suite 1400,  Chicago, Illinois 60661.  Copies of such
material may be obtained from the Public Reference Section of the Commission  at
450  Fifth  Street,  N.W., Washington,  D.C.  20549, at  prescribed  rates. Such
material may also be inspected at the offices of the New York Stock Exchange and
the Pacific Stock Exchange.

    This Prospectus constitutes a part of a Registration Statement filed by  the
Company  with the Commission under the Securities  Act of 1933, as amended. This
Prospectus omits  certain  of  the information  contained  in  the  Registration
Statement,  and  reference  is hereby  made  to the  Registration  Statement and

                                       31
<PAGE>
related exhibits for  further information with  respect to the  Company and  the
Common  Stock. Any statements contained herein  concerning the provisions of any
document are not necessarily complete, and, in each instance, reference is  made
to  the copy of such document filed  as an exhibit to the Registration Statement
or otherwise filed with the Commission. Each such statement is qualified in  its
entirety by such reference.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The  Company's Annual Report on Form 10-K for the fiscal year ended June 30,
1994, which  was  filed by  the  Company with  the  Commission pursuant  to  the
Exchange  Act,  is  hereby incorporated  by  reference in  this  Prospectus. All
documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or 15(d) of
the Exchange Act  subsequent to the  date of  this Prospectus and  prior to  the
termination  of these offerings shall be  deemed to be incorporated by reference
into this Prospectus and to be a part hereof from the respective dates of filing
of such documents.

    Any statement contained in a document incorporated by reference herein shall
be deemed to be modified  or superseded for purposes  of this Prospectus to  the
extent  that a  statement contained  herein or  in any  other subsequently filed
document which also is incorporated  by reference herein modifies or  supersedes
such  statement.  Any such  statement  so modified  or  superseded shall  not be
deemed, except  as so  modified or  superseded,  to constitute  a part  of  this
Prospectus.

    The  Company  will  provide  without  charge to  each  person  to  whom this
Prospectus is delivered, upon oral or written  request, a copy of any or all  of
the  foregoing  documents  incorporated  herein  by  reference,  except  for the
exhibits to such documents (unless  such exhibits are specifically  incorporated
by  reference  into  information  that  this  Prospectus  incorporates). Written
requests should be directed to  International Rectifier Corporation, 233  Kansas
Street,  El Segundo, California 90245, Attention: Corporate Secretary. Telephone
requests should be directed to (310) 322-3331.

                                       32
<PAGE>
                                    GLOSSARY

    The  following  are  definitions  of certain  technical  terms  used  in the
Prospectus:

    ASSEMBLY -- The  process of encasing  a semiconductor chip  in a package  to
produce a finished product.

    BIPOLAR TRANSISTOR -- A transistor that is controlled by electrical current.

    CONTROL  IC  -- A  semiconductor device  having logic  or control  and power
handling capability (e.g., a Power MOSFET) on the same chip.

    DIODE -- A discrete device which conducts current in one direction.

    DISCRETE DEVICE --  An electrical  or electronic component  that performs  a
single function.

    FAST  RECOVERY DIODE -- A diode suited to applications above 200 volts where
high switching speed is desirable.

    FET (FIELD  EFFECT  TRANSISTOR)  --  A  transistor  that  is  controlled  by
electrical voltage.

    IGBT  (INSULATED GATE BIPOLAR  TRANSISTOR) -- A variant  of the power MOSFET
that incorporates bipolar transistor technology.

    IC (INTEGRATED CIRCUIT) -- A device  that contains multiple components on  a
single silicon chip to form an electronic circuit.

    PACKAGE -- The external structure that encases a semiconductor chip.

    POWER  MOSFET -- A power field  effect transistor (FET) that is manufactured
using MOS (Metal Oxide Semiconductor) processing technology similar to that used
in manufacturing certain  integrated circuits. The  Company's power MOSFETs  are
sold under the trademark HEXFET.

    POWER  SEMICONDUCTOR -- A  silicon-based component that  operates at a power
level above approximately one watt  and has the ability  both to conduct and  to
block  the flow of electricity. Power semiconductors are used to switch (turn on
and off)  electricity or  to condition  electricity, for  example by  converting
alternating current to direct current.

    RECTIFIER -- A diode used to convert alternating current to direct current.

    SCHOTTKY  DIODE  --  An  ultra-fast  rectifier  for  use  in high-frequency,
low-voltage circuits.

    THYRISTOR (SCR)  --  A four  layer  semiconductor  device that  has  a  gate
structure allowing current to flow in an electrical circuit.

    TRANSISTOR  -- A  semiconductor device that  switches (turns on  and off) or
amplifies electricity in a circuit.

    WAFER FABRICATION --  The sequence  of semiconductor  processing steps  that
creates semiconductor devices on a silicon wafer.

                                       33
<PAGE>
                [ALTERNATE SECTION FOR INTERNATIONAL PROSPECTUS]
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    NO  DEALER, SALESPERSON OR ANY OTHER PERSON  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO  MAKE ANY  REPRESENTATIONS NOT CONTAINED  IN THIS  PROSPECTUS,
AND,  IF GIVEN OR MADE,  SUCH INFORMATION OR REPRESENTATIONS  MUST NOT BE RELIED
UPON AS HAVING BEEN  AUTHORIZED BY THE  COMPANY OR BY  ANY OF THE  INTERNATIONAL
MANAGERS.  THIS PROSPECTUS DOES NOT CONSTITUTE  AN OFFER OF ANY SECURITIES OTHER
THAN THOSE TO  WHICH IT RELATES  OR AN OFFER  TO SELL, OR  A SOLICITATION OF  AN
OFFER  TO  BUY,  TO  ANY PERSON  IN  ANY  JURISDICTION WHERE  SUCH  AN  OFFER OR
SOLICITATION WOULD BE UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR  ANY
SALE  MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT
THE INFORMATION CONTAINED  HEREIN IS CORRECT  AS OF ANY  TIME SUBSEQUENT TO  THE
DATE HEREOF.

    THERE  ARE RESTRICTIONS ON THE OFFER AND  SALE OF THE SHARES OF COMMON STOCK
OFFERED HEREBY IN THE UNITED KINGDOM. ALL APPLICABLE PROVISIONS OF THE FINANCIAL
SERVICES ACT 1986 AND THE  COMPANIES ACT 1985 WITH  RESPECT TO ANYTHING DONE  BY
ANY  PERSON IN RELATION TO THE COMMON  STOCK IN, FROM OR OTHERWISE INVOLVING THE
UNITED KINGDOM MUST BE COMPLIED WITH. SEE "UNDERWRITING."

    IN THIS PROSPECTUS,  REFERENCES TO "DOLLARS"  AND "$" ARE  TO UNITED  STATES
DOLLARS UNLESS STATED OTHERWISE.

                             ---------------------

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                        Page
                                                         ---
<S>                                                  <C>
Prospectus Summary.................................           3
The Company........................................           5
Risk Factors.......................................           5
Use of Proceeds....................................           8
Capitalization.....................................           8
Price Range of Common Stock........................           9
Dividend Policy....................................           9
Selected Consolidated Financial Data...............          10
Management's Discussion and Analysis of Financial
  Condition and Results of Operations..............          12
Business...........................................          15
Management.........................................          24
Description of Capital Stock.......................          25
Certain United States Federal Tax
  Consequences To Non-United States
  Holders..........................................          27
Underwriting.......................................          29
Legal Opinions.....................................          31
Experts............................................          31
Available Information..............................          31
Incorporation of Certain Documents by Reference....          32
Glossary...........................................          33
Index to Consolidated Financial Statements.........         F-1
</TABLE>

                                4,500,000 SHARES

                                     [LOGO]

                                 INTERNATIONAL
                                   RECTIFIER
                                  CORPORATION

                                  COMMON STOCK

                              -------------------

                                   PROSPECTUS
                                          , 1994

                             ---------------------

                                LEHMAN BROTHERS

   
                       KIDDER, PEABODY INTERNATIONAL PLC
    

                             MONTGOMERY SECURITIES

                           PAINEWEBBER INTERNATIONAL

                               SMITH BARNEY INC.

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