POWER INTEGRATIONS INC
10-Q, 1998-11-10
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
 
================================================================================

                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, DC. 20549
                         ____________________________
                                   FORM 10-Q

(Mark One)
[X]  Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange
     Act of 1934 for the quarterly period ended September 30, 1998
or
[_]  Transition report pursuant to Section 13 or 15(d) of the Securities
     Exchange Act of 1934 for the transition period from ______________ to
     ______________

                         Commission File Number 0-23441
                              ____________________
                            POWER INTEGRATIONS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

        DELAWARE                                                94-3065014
(STATE OR OTHER JURISDICTION OF                              (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)                               IDENTIFICATION NO.)

              477 N. MATHILDA AVENUE, SUNNYVALE, CALIFORNIA 94086
             (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)   (ZIP CODE)
                                 (408) 523-9200
              (REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE)
          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
                                        
           TITLE OF EACH CLASS             NAME OF EXCHANGE ON WHICH REGISTERED
           -------------------             ------------------------------------ 
                  NONE                                    NONE
                                        
          SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                                        
                         COMMON STOCK, $.001 PAR VALUE
                                (TITLE OF CLASS)
                         _____________________________
                                        
   Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.   YES [X]   NO [_]

   Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

            Class                              Outstanding at October 30, 1998

       -------------------------------        ---------------------------------
        Common Stock, $.001 par value                  12,444,608 shares

================================================================================
<PAGE>
 
                            POWER INTEGRATIONS, INC.

                               TABLE OF CONTENTS

 
PART I.  FINANCIAL INFORMATION                                            Page
 
    Item 1.  Financial Statements.
 
             Condensed Consolidated Balance Sheets                         3
 
             Condensed Consolidated Statements of Operations               4
 
             Condensed Consolidated Statements of Cash Flows               5
 
             Notes To Condensed Consolidated Financial Statements          6
 
    Item 2.  Management's Discussion and Analysis of Financial Condition 
             and Results of Operations                                    10
 
 
PART II. OTHER INFORMATION
 
     Item 1. Legal Proceedings                                            20
 
     Item 2. Changes in Securities and Use of Proceeds                    20
 
     Item 3. Defaults upon Senior Securities                              20
 
     Item 4. Submission of Matters to Vote of Security Holders            20
 
     Item 5. Other Information                                            20
 
     Item 6. Exhibits and Reports on Form 8-K                             20
 
SIGNATURES                                                                21

                                       2
<PAGE>
 
                         PART I. FINANCIAL INFORMATION

ITEM 1.   FINANCIAL STATEMENTS

                            POWER INTEGRATIONS, INC.
                                        
                     CONDENSED CONSOLIDATED BALANCE SHEETS
                                        
                                 (IN THOUSANDS)
                                        
                                                 SEPTEMBER 30,    DECEMBER 31,
                                                    1998              1997
                                                 -------------    ------------
                                                 (unaudited)
                 ASSETS

CURRENT ASSETS:
   Cash and cash equivalents..................    $ 10,708         $ 25,553
   Short-term investments.....................      27,493            3,455
   Accounts receivable........................       5,578            6,243
   Inventories................................       9,017            7,328
   Prepaid expenses and other current assets..         440              349
                                                 -------------    ------------
        Total current assets..................      53,236           42,928
                                                 -------------    ------------

PROPERTY AND EQUIPMENT, net...................       6,577            5,631
                                                 -------------    ------------
                                                  $ 59,813         $ 48,559
                                                 =============    ============ 

       LIABILITIES AND STOCKHOLDERS' EQUITY
 
CURRENT LIABILITIES:
   Current portion of capitalized lease 
     obligations..............................    $  1,977         $  1,787
   Accounts payable...........................       5,611            6,903
   Accrued payroll and related expenses.......       1,935            1,685
   Taxes payable and other accrued 
     liabilities..............................       2,850            1,042
   Deferred income on sales to distributors...       2,746            1,380
                                                 -------------    ------------
        Total current liabilities.............      15,119           12,797
                                                 -------------    ------------
CAPITALIZED LEASE OBLIGATIONS, net of 
     current portion..........................       2,141            2,435
                                                 -------------    ------------
 
STOCKHOLDERS' EQUITY:
   Common stock...............................          12               12
   Additional paid-in capital.................      56,878           56,220
   Common stock warrants......................          12               12
   Stockholder notes receivable...............        (405)            (405)
   Deferred compensation......................        (356)            (461)
   Cumulative translation adjustment..........         (84)             (76)
   Accumulated deficit........................     (13,504)         (21,975)
                                                 -------------    ------------
        Total stockholders' equity............      42,553           33,327
                                                 -------------    ------------
                                                  $ 59,813         $ 48,559
                                                 =============    ============ 

The accompanying notes are an integral part of these condensed consolidated
balance sheets.

                                       3
<PAGE>
 
                            POWER INTEGRATIONS, INC.
                                        
                CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                                  (UNAUDITED)
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                        
<TABLE>
<CAPTION>
                                                 THREE MONTHS ENDED SEPTEMBER 30,       NINE MONTHS ENDED SEPTEMBER 30,
                                                -----------------------------------  -----------------------------------
                                                      1998               1997              1998               1997
                                                -----------------   ---------------  -----------------  ----------------
<S>                                             <C>               <C>                <C>               <C>
NET REVENUES:
  Product sales...............................           $19,907           $12,959            $48,456           $29,668
  Royalties...................................               410               384              1,400               790
                                                -----------------   ---------------  -----------------  ----------------
     Total net revenues.......................            20,317            13,343             49,856            30,458
                                                -----------------   ---------------  -----------------  ---------------- 
COST OF REVENUES..............................            10,635             7,492             26,865            17,602
                                                -----------------   ---------------  -----------------  ---------------- 
GROSS PROFIT..................................             9,682             5,851             22,991            12,856
                                                -----------------   ---------------  -----------------  ---------------- 
OPERATING EXPENSES:
  Research and development....................             1,947             1,404              5,226             3,696
  Sales and marketing.........................             2,376             1,839              5,989             4,408
  General and administrative..................             1,067               620              2,345             1,460
                                                -----------------   ---------------  -----------------  ----------------
     Total operating expenses.................             5,390             3,863             13,560             9,564
                                                -----------------   ---------------  -----------------  ----------------
INCOME FROM OPERATIONS........................             4,292             1,988              9,431             3,292
                                                -----------------   ---------------  -----------------  ----------------
OTHER INCOME (EXPENSE), net...................               399              (196)               775              (549)
                                                -----------------   ---------------  -----------------  ---------------- 
INCOME BEFORE PROVISION FOR
 INCOME TAXES.................................             4,691             1,792             10,206             2,743
 
PROVISION FOR INCOME TAXES....................               351               306              1,735               373
                                                -----------------   ---------------  -----------------  ---------------- 
NET INCOME....................................           $ 4,340           $ 1,486            $ 8,471           $ 2,370
                                                -----------------   ---------------  -----------------  ---------------- 
EARNINGS PER SHARE:
  Basic.......................................             $0.35             $0.91              $0.70             $2.09
                                                -----------------   ---------------  -----------------  ----------------
  Diluted.....................................             $0.33             $0.15              $0.65             $0.26
                                                -----------------   ---------------  -----------------  ---------------- 
SHARES USED IN PER SHARE CALCULATION:
  Basic.......................................            12,229             1,632             12,133             1,134
                                                -----------------   ---------------  -----------------  ----------------
  Diluted.....................................            13,128             9,875             13,110             9,082
                                                =================   ===============  =================  ================
</TABLE>

The accompanying notes are an integral part of these condensed consolidated
financial statements.

                                       4
<PAGE>
 
                            POWER INTEGRATIONS, INC.
                                        
                CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                  (UNAUDITED)
                                        
                                 (IN THOUSANDS)
                                        
<TABLE>
<CAPTION>
                                                                                      NINE MONTHS ENDED SEPTEMBER 30,
                                                                                  --------------------------------------
                                                                                        1998                1997
                                                                                  -------------------  -----------------
<S>                                                                              <C>                  <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income....................................................................          $  8,471              $ 2,370
Adjustments to reconcile net income to net cash provided by
 operating activities:
  Depreciation and amortization...............................................             2,278                1,613
  Provision for accounts receivable and other allowances......................               (26)                 709
  Deferred compensation expense...............................................               105                   71
  Change in operating assets and liabilities:
     Accounts receivable......................................................               691               (4,844)
     Inventories..............................................................            (1,689)                (662)
     Prepaid expenses and other current assets................................               (91)                 (83)
     Accounts payable.........................................................            (1,292)               2,846
     Accrued liabilities......................................................             2,050                1,103
     Deferred income on sales to distributors.................................             1,366                  827
                                                                                  -------------------  -----------------      
        Net cash provided by operating activities.............................            11,863                3,950
                                                                                  -------------------  -----------------
 
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property and equipment.........................................            (1,785)                (712)
  Purchases of short-term investments.........................................           (38,071)              (9,947)
  Proceeds from sales and maturities of short-term investments................            14,033                9,895
                                                                                  -------------------  -----------------
        Net cash used in investing activities.................................           (25,823)                (764)
                                                                                  -------------------  ----------------- 
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net proceeds from issuance of common stock..................................               658                  577
  Principal payments under capitalized lease obligations......................            (1,543)              (1,232)
                                                                                  -------------------  -----------------
        Net cash used in financing activities.................................              (885)                (655)
                                                                                  -------------------  -----------------

NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS..........................           (14,845)               2,531
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD..............................            25,553                3,282
                                                                                  -------------------  -----------------
CASH AND CASH EQUIVALENTS AT END OF PERIOD....................................          $ 10,708              $ 5,813
                                                                                  ===================  ================= 
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
  Capitalized lease obligations incurred for property and equipment...........          $  1,439              $ 1,253
                                                                                  ===================  =================  
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
  Cash paid for interest......................................................          $    388              $   626
                                                                                  ===================  ================= 
  Cash paid for income taxes..................................................          $    475              $     7
                                                                                  ===================  ================= 
</TABLE>

The accompanying notes are an integral part of these condensed consolidated
financial statements.

                                       5
<PAGE>
 
                            POWER INTEGRATIONS, INC.
                                        
              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

                                  (UNAUDITED)
                                        
1.  BASIS OF PRESENTATION:

   The condensed consolidated financial statements include the accounts of Power
Integrations, Inc. (the Company), a Delaware corporation, and its wholly-owned
subsidiaries. Significant inter-company accounts and transactions have been
eliminated.

   While the financial information furnished is unaudited, the condensed
consolidated financial statements included in this report reflect all
adjustments (consisting only of normal recurring adjustments) which the Company
considers necessary for the fair presentation of the results of operations for
the interim periods covered and of the financial condition of the Company at the
date of the interim balance sheet. The results for interim periods are not
necessarily indicative of the results for the entire year. The condensed
consolidated financial statements should be read in conjunction with the Power
Integrations, Inc. consolidated financial statements for the year ended December
31, 1997 included in its Form 10-K/A.

2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

 Cash and Cash Equivalents and Short-Term Investments

   The Company considers cash invested in highly liquid financial instruments
with an original maturity of three months or less to be cash equivalents. Cash
investments in highly liquid financial instruments with original maturities
greater than three months but less than one year are classified as short-term
investments. As of September 30, 1998, the Company's short-term investments
consist of U.S. Government backed securities and commercial paper, which are
classified as held-to-maturity and are valued using the amortized cost method
which approximates market.

 Revenue Recognition

   Product revenues consist of sales to OEMs and merchant power supply
manufacturers and to distributors. Revenues from product sales to OEMs and
merchant power supply manufacturers are recognized upon shipment. Sales to
distributors are made under terms allowing certain rights of return and
protection against subsequent price declines on the Company's products held by
the distributors. As a result of the Company's distributor agreements, the
Company defers recognition of revenue and the proportionate costs of revenues
derived from sales to distributors until such distributors resell the Company's
products to their customers. The margin deferred as a result of this policy is
reflected as "deferred income on sales to distributors" in the accompanying
condensed consolidated balance sheets.

 Estimates

   The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts of assets and liabilities and disclosures of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

 New Accounting Standards

   In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards (SFAS) No. 130, "Reporting Comprehensive
Income," which establishes standards for reporting and presentation of
comprehensive income. SFAS No. 130 requires companies to report a new measure of
income. The Company adopted SFAS No. 130 in the first quarter of 1998.
"Comprehensive Income" is to include foreign currency translation gains and
losses and other unrealized gains and losses that have historically been
excluded from net income and reflected instead in equity. The adoption of SFAS
No. 130 did not have a material impact on the Company's financial statements.

                                       6
<PAGE>
 
                            POWER INTEGRATIONS, INC.
                                        
       NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
                                        
   In June 1997, the Financial Accounting Standards Board issued SFAS No. 131,
"Disclosures About Segments of an Enterprise and Related Information," which
requires companies to report financial and descriptive information about its
reportable operating segments. SFAS No. 131 will be adopted by the Company in
its 1998 annual consolidated financial statements. The Company anticipates that
SFAS No. 131 will not have a material impact on its financial statements.

3.  INVENTORIES:

   Inventories are stated at the lower of cost (first-in, first-out) or market.
Inventories consist of the following (in thousands):

<TABLE>
<CAPTION>
                                                                                SEPTEMBER 30,  DECEMBER 31,
                                                                                    1998           1997
                                                                              ------------------------------
<S>                                                                             <C>            <C>
   Raw materials..............................................................         $4,064         $3,323
   Work-in-process............................................................          2,997          2,977
   Finished goods.............................................................          1,956          1,028
                                                                                       ------         ------
                                                                                       $9,017         $7,328
                                                                                       ======         ======
</TABLE>

4.    SIGNIFICANT CUSTOMERS AND EXPORT SALES:

 Customer Concentration

   The Company's end user base is highly concentrated and a relatively small
number of OEMs and distributors accounted for a significant portion of the
Company's net revenues. For the nine months ended September 30, 1998 and 1997,
ten customers accounted for approximately 67% of total net revenues in each such
period.

   The following customers accounted for more than 10% of total net revenues:

<TABLE>
<CAPTION>
                                                                                         NINE MONTHS ENDED
                                                                                           SEPTEMBER 30,
                                                                                    --------------------------
   Customer                                                                            1998            1997
   --------                                                                        ------------   -----------
<S>                                                                                <C>             <C>
   A..........................................................................             22%             23%
   B..........................................................................             13%              *
   C..........................................................................              *              16%
</TABLE> 
- ------------------------
*   less than 10% or no sales
 
 Export Sales

   The Company markets its products in North America and in foreign countries
through its sales personnel and a worldwide network of independent sales
representatives and distributors. As a percentage of total net revenues, export
sales, which consist of domestic sales to customers in foreign countries, are
comprised of the following:

<TABLE>
<CAPTION>
                                                                                         NINE MONTHS ENDED
                                                                                           SEPTEMBER 30,
                                                                                    --------------------------
                                                                                        1998            1997
                                                                                    ------------   -----------
<S>                                                                                <C>             <C>
   Japan......................................................................              3%              5%
   Taiwan.....................................................................             28%             29%
   Hong Kong..................................................................             23%             27%
   Western Europe.............................................................             16%             11%
   Other......................................................................             12%              9%
                                                                                         -----           -----
                   Total foreign..............................................             82%             81%
                                                                                         =====           =====
</TABLE>

                                       7
<PAGE>
 
                            POWER INTEGRATIONS, INC.
                                        
       NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
                                        
5.  EARNINGS PER SHARE:

   In December 1997, the Company adopted Statement of Financial Accounting
Standards (SFAS) No. 128 "Earnings per Share." SFAS No. 128 requires companies
to compute earnings per share under two different methods (basic and diluted).
Basic earnings per share is calculated by dividing net income by the weighted
average shares of common stock outstanding during the period. Diluted earnings
per share is calculated by dividing net income by the weighted average shares of
outstanding common stock and common stock equivalents during the period. Common
stock equivalents included in the diluted calculation consist of dilutive shares
issuable upon the exercise of outstanding common stock options and warrants
computed using the treasury stock method.

   The following table sets forth the calculation of basic and diluted earnings
per share  (in thousands, except per share amounts):

<TABLE>
<CAPTION>
                                                                       THREE MONTHS ENDED          NINE MONTHS ENDED
                                                                          SEPTEMBER 30,               SEPTEMBER 30,
                                                                    -------------------------   -----------------------
                                                                        1998          1997          1998          1997
                                                                    ------------  -----------   -----------  ----------
<S>                                                              <C>           <C>           <C>           <C>
Basic earnings per share:
  Net income...................................................       $ 4,340        $1,486       $ 8,471        $2,370
                                                                    ------------  -----------   -----------  ----------
  Weighted average common shares...............................        12,229         1,632        12,133         1,134
                                                                    ------------  -----------   -----------  ----------
     Basic earnings per share..................................       $  0.35        $ 0.91       $  0.70        $ 2.09
                                                                    ============  ===========   ===========  ==========
 
Diluted earnings per share:
  Net income...................................................       $ 4,340        $1,486       $ 8,471        $2,370
                                                                    ------------  -----------   -----------  ----------
  Weighted average common shares...............................        12,229         1,632        12,133         1,134
  Weighted average common share equivalents:
     Convertible preferred stock...............................            --         7,447            --         7,447
     Options...................................................           647           574           672           398
     Warrants..................................................           252           222           305           103
                                                                    ------------  -----------   -----------  ----------
  Diluted weighted average common shares.......................        13,128         9,875        13,110         9,082
                                                                    ------------  -----------   -----------  ----------
        Diluted earnings per share.............................       $  0.33        $ 0.15       $  0.65        $ 0.26
                                                                    ============  ===========   ===========  ==========
</TABLE>

6.  PROVISION FOR INCOME TAXES:

   Income tax expense for the nine month periods ended September 30, 1998 and
1997 includes a provision for Federal, state and foreign taxes based on the
annual estimated effective tax rate applicable to the Company and its
subsidiaries for the year.

7.  LEGAL PROCEEDINGS:

   In July 1998, the Company filed a complaint for patent infringement in the
U.S. District Court, Northern District of California against its largest end
user, Motorola, Inc. ("Motorola"). In August 1998, the Company voluntarily
dismissed that complaint, and filed a new complaint in the U.S. District Court,
District of Delaware, alleging that Motorola has infringed and continues to
infringe on two of the Company's circuit patents. The Company seeks, among
other things, an order enjoining Motorola from infringing on the Company's
patents and an award for damages resulting from the alleged infringement. In
October 1998, Motorola asserted various counterclaims against the Company
alleging that the Company is infringing on certain of Motorola's patents. The
Company believes that Motorola's counterclaims are without merit and intends
to vigorously defend itself against such claims.

   Litigation may be necessary to resolve the claims asserted by the Company
against Motorola, and any claims which Motorola may assert in the future against
the Company, and to defend, enforce and protect the Company's

                                       8
<PAGE>
 
                            POWER INTEGRATIONS, INC.

   NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)

intellectual property rights. There can be no assurance that the Company will
prevail in any litigation with Motorola, or any other party. Any such
litigation, whether or not determined in the Company's favor or settled by the
Company, would be costly and would divert the efforts and attention of the
Company's management and technical personnel from normal business operations,
which could have a material adverse effect on the Company's business, financial
condition and results of operations. In addition, any litigation between the
Company and Motorola could delay the Company's ability to have its products
incorporated into a customer's products at the design stage. Delays in
customers' decisions to use the Company's products could have a material adverse
effect on the Company's business, financial condition and results of operations.
Adverse determinations in any litigation could result in the loss of certain of
the Company's proprietary rights, subject the Company to significant
liabilities, require the Company to seek licenses from third parties, or prevent
the Company from manufacturing and selling certain of its products or licensing
its technology, any of which could have a material adverse effect on the
Company's business, financial condition and results of operations.

                                       9
<PAGE>
 
ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS.

   This Management's Discussion and Analysis of Financial Condition and Results
of Operations includes a number of forward-looking statements which reflect the
Company's current views with respect to future events and financial performance.
These forward-looking statements are subject to certain risks and uncertainties,
including those discussed in the "Factors That May Affect Future Results of
Operations" and elsewhere in this Form 10-Q that could cause actual results to
differ materially from historical results or those anticipated. In this report,
the words "anticipates," "believes," "expects," "future," "intends,"
and similar expressions identify forward-looking statements. Readers are
cautioned not to place undue reliance on these forward-looking statements, which
speak only as of the date hereof.

   The following management's discussion and analysis of financial condition and
results of operations should be read in conjunction with management's discussion
and analysis of financial condition and results of operations included in the
Company's Form 10-K/A for the year ended December 31, 1997.

OVERVIEW

   Power Integrations, Inc. (the "Company") designs, develops and markets
proprietary, high-voltage analog integrated circuits ("ICs") for use in AC to DC
power conversion.  The Company has targeted high-volume power supply markets,
including the cellular telephone, personal computer, cable and direct broadcast
satellite and various consumer and industrial electronics markets.  The Company
initially focuses on those markets that are sensitive to size, portability,
energy efficiency and time-to-market.  The Company believes its patented
TOPSwitch ICs, introduced in 1994, are the first highly integrated power
conversion ICs to achieve widespread market acceptance.  The Company introduced
an enhanced family of ICs, TOPSwitch-II, in April 1997. In September 1998, the
Company announced the TinySwitch family of integrated circuits for power
supplies in a broad range of electronic products. TinySwitch ICs  incorporating
the Company's new EcoSmart technology  enable a new class of light, compact,
energy-efficient power supplies. This new family of ICs is designed to reduce
energy leakage from power supplies.

RESULTS OF OPERATIONS

   The following table sets forth certain operating data as a percentage of
total net revenues for the periods indicated.

<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF                   PERCENTAGE OF        
                                                                TOTAL NET REVENUES FOR          TOTAL NET REVENUES FOR   
                                                                  THREE MONTHS ENDED              NINE MONTHS ENDED      
                                                                    SEPTEMBER 30,                   SEPTEMBER 30,        
                                                               -------------------------     ---------------------------- 
                                                                   1998          1997            1998            1997
                                                               -----------   -----------     -------------  ------------- 
<S>                                                           <C>             <C>             <C>             <C>
Net revenues:
  Product sales........................................           98.0%           97.1%           97.2%           97.4%
  Royalties............................................            2.0             2.9             2.8             2.6
                                                               -----------   -----------     -------------  ------------- 
     Total net revenues................................          100.0           100.0           100.0           100.0
                                                               -----------   -----------     -------------  ------------- 
Cost of revenues.......................................           52.3            56.1            53.8            57.8
                                                               -----------   -----------     -------------  ------------- 
Gross profit...........................................           47.7            43.9            46.2            42.2
                                                               -----------   -----------     -------------  ------------- 
Operating expenses:
  Research and development.............................            9.6            10.5            10.5            12.1
  Sales and marketing..................................           11.7            13.8            12.0            14.5
  General and administrative...........................            5.3             4.7             4.7             4.8
                                                               -----------   -----------     -------------  ------------- 
     Total operating expenses..........................           26.6            29.0            27.2            31.4
                                                               -----------   -----------     -------------  ------------- 
Income from operations.................................           21.1            14.9            19.0            10.8
Other income (expense), net............................            1.9            (1.5)            1.5            (1.8)
                                                               -----------   -----------     -------------  ------------- 
Income before provision for income taxes...............           23.0            13.4            20.5             9.0
                                                               -----------   -----------     -------------  ------------- 
Provision for income taxes.............................            1.7             2.3             3.5             1.2
                                                               -----------   -----------     -------------  ------------- 
Net income.............................................           21.3%           11.1%           17.0%            7.8%
                                                               ===========   ===========     =============  =============
</TABLE>

                                       10
<PAGE>
 
COMPARISON OF THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1998 AND 1997


   Net revenues.   Net revenues consist of revenues from product sales, which
are calculated net of returns and allowances, plus royalties paid by licensees
of the Company's technology. Net revenues for the third quarter ended September
30, 1998 were $20.3 million compared to $13.3 million for the third quarter of
1997, an increase of $7.0 million, or 53%. Net revenues for the nine months
ended September 30, 1998 were $49.9 million compared to $30.5 million for the
comparable period of 1997, an increase of $19.4 million, or 64%.

   Net revenues from product sales represented $19.9 million and $13.0 million
in the third quarter of 1998 and 1997, respectively. Net revenues from product
sales represented $48.5 million and $29.7 million in the first nine months of
1998 and 1997, respectively. The increase in net revenues from product sales for
the three months and nine months ended September 30, 1998 was due primarily to
higher sales volume of the Company's TOPSwitch family of products across a
larger customer base. Net revenues also grew because of an increase in royalty
revenues. Royalties were $410,000 for the third quarter of 1998, an increase of
$26,000, or 7%, from the third quarter of 1997. Royalties were $1.4 million for
the nine months ended September 30, 1998, an increase of $610,000, or 77%, from
the nine months ended September 30, 1997.

   International sales were $16.7 million in the third quarter of 1998 compared
to $10.8 million for the same period in 1997, an increase of $5.9 million, or
55%, representing 82% of net revenues compared to 81% in the comparable period
of 1997. International sales were $40.7 million for the nine months ended
September 30, 1998 compared to $23.9 million for the same period in 1997, an
increase of $16.8 million, or 70%, representing 82% of net revenues compared to
81% in the comparable period of 1997. Although the power supplies using the
Company's products are designed and distributed worldwide, most of such power
supplies are manufactured in Asia. As a result, sales to this region were 66%
and 70% of product sales for the three months ended September 30, 1998 and 1997,
respectively, and 65% and 64% of product sales for the nine months ended
September 30, 1998 and 1997, respectively. The Company expects international
sales to continue to account for a large portion of the Company's net revenues.

   The Company's direct sales are divided approximately 50% to distributors and
50% to OEMs and merchants. For the quarter ended September 30, 1998, sales to
two customers accounted for 24% and 13% of net revenues, and for the quarter
ended September 30, 1997, one of those same customers accounted for 28% of net
revenues and another customer accounted for 16% of net revenues. For the nine
months ended September 30, 1998, sales to two customers accounted for 22% and
13% of net revenues, and for the comparable period ended September 30, 1997, one
of those same customers accounted for 22% of net revenues and another customer
accounted for 15% of net revenues.

   The exact dollar amounts and percentages of sales to end customers are
difficult to ascertain because most of such sales occur through distributors or
indirectly through sales to merchant power supply manufacturers which, in turn,
sell power supplies to OEMs. However,  the Company estimates that direct and
indirect sales to Motorola, who is the Company's largest end user, accounted for
approximately 15% and 22% of the Company's net revenues for the quarters ended
September 30, 1998 and 1997, respectively, and approximately 12% and 21% of the
Company's net revenues for the nine months ended September 30, 1998 and 1997,
respectively. Direct sales to Motorola were approximately 6% and 3% of the
Company's net revenues for the quarters ended September 30, 1998 and 1997,
respectively, and approximately 5% and 4% of the Company's net revenues for the
nine months ended September 30, 1998 and 1997, respectively.

   Cost of revenues; Gross profit.   Gross profit is equal to net revenues less
cost of revenues. The Company's cost of revenues consists primarily of costs
associated with the purchase of wafers, the assembly and packaging of its
products, and internal labor and overhead associated with the testing of both
wafers and packaged components. Gross profit for the third quarter of 1998 was
$9.7 million, or 47.7%, of net revenues, compared to $5.9 million, or 43.9%, of
net revenues for the same period in 1997. Gross profit for the nine months ended
September 30, 1998 was $23.0 million, or 46.2%, of net revenues, compared to
$12.9 million, or 42.2%, of net revenues for the same period 

                                       11
<PAGE>
 
in 1997. The increase in gross profit for the three months and nine months ended
September 30, 1998 was primarily due to the combined effects of the absorption
of certain fixed costs over the increased sales volume, lower prices for wafers,
favorable Japanese Yen exchange rates and better manufacturing yields due to
improved test equipment. There can be no assurance that these or other factors
will have a favorable impact on gross profit in future periods.

   Research and development expenses.   Research and development expenses
consist primarily of employee-related expenses, expensed material and facility
costs associated with the development of new processes and new products. The
Company also expenses prototype wafers and mask sets related to new products as
research and development costs until new products are released to production.
Research and development expenses for the third quarter of 1998 were $1.9
million compared to $1.4 million for the same period in 1997, an increase of
$500,000, or 36%, representing 9.6% and 10.5% of net revenues, respectively.
Research and development expenses for the first nine months of 1998 were $5.2
million compared to $3.7 million for the same period in 1997, an increase of
$1.5 million, or 40%, representing 10.5% and 12.1% of net revenues,
respectively. The increase for the three months and nine months ended September
30, 1998 was primarily due to increased salaries and other costs related to the
hiring of additional engineering personnel, outside consulting fees and expensed
prototype materials resulting from the transition of foundry manufacturing
processes. The Company expects that research and development expenses will
continue to increase in absolute dollars but will fluctuate as a percentage of
net revenues.

   Sales and marketing expenses.   Sales and marketing expenses consist
primarily of employee-related expenses, commissions to sales representatives and
facilities expenses, including expenses associated with the Company's regional
sales and support offices. Sales and marketing expenses for the third quarter of
1998 were $2.4 million compared to $1.8 million for the same period in 1997, an
increase of $600,000, or 33%, representing 11.7% and 13.8% of net revenues,
respectively. Sales and marketing expenses for the first nine months of 1998
were $6.0 million compared to $4.4 million for the same period in 1997, an
increase of $1.6 million, or 36%, representing 12.0% and 14.5% of net revenues,
respectively. The increase for the three months and nine months ended September
30, 1998 was primarily a result of the addition of personnel to support
international sales and field application engineers and to staff two new sales
offices in Asia which opened in June 1997. The Company expects that sales and
marketing expenses will continue to increase in absolute dollars but will
fluctuate as a percentage of net revenues.

   General and administrative expenses.   General and administrative expenses
consist primarily of employee-related expenses for administration, finance,
human resources, general management and facilities, and consulting, outside
services, legal and auditing expenses. For the quarters ended September 30, 1998
and 1997, general and administrative expenses were $1.1 million and $620,000,
respectively, which represented 5.3% and 4.7% of net revenues, respectively. For
the nine month periods ended September 30, 1998 and 1997, general and
administrative expenses were $2.3 million and $1.5 million, respectively, which
represented 4.7% and 4.8% of net revenues, respectively. This increase in
absolute dollars was attributable to additional headcount to support the
Company's growth and additional professional and outside services required by
the Company as a result of its public reporting obligations.  The Company
expects that general and administrative expenses will continue to increase in
absolute dollars and may increase as a percentage of net revenues, particularly
in light of the Company's recently filed patent infringement claim against
Motorola.

   Other income (expense), net.   Other income (expense), net, for the third
quarter of 1998 increased by $595,000 over the same period in 1997, and for the
nine months ended September 30, 1998 increased by $1.3 million over the same
period in 1997. The increase for the three months and nine months ended
September 30, 1998 was due primarily to additional interest income from an
increase in short-term investments in 1998 and a reduction in interest expense
as a result of the repayment of $3.0 million of subordinated debt in the fourth
quarter of 1997. The Company expects to continue to utilize term debt to finance
its capital equipment needs.

   Provision for income taxes.   Provision for income taxes represents Federal,
state and foreign taxes. The provision for income taxes was $351,000 for the
third quarter of 1998 compared to $306,000 for the same period in 1997. The
provision for income taxes was $1.7 million for the first nine months of 1998
compared to $373,000 for the same period in 1997. The Company is using an
effective tax rate of 17% reflecting the profitable results for the 1998 period,
while the provision for 1997 represented minimum tax. The difference between the
statutory rate and the Company's effective tax rate for 1998 is primarily due to
the beneficial impact of net operating loss carryforwards.

                                       12
<PAGE>
 
LIQUIDITY AND CAPITAL RESOURCES

   At September 30, 1998, the Company had approximately $38.2 million in cash,
cash equivalents and short-term investments. In addition, under a working
capital line of credit agreement with a bank, the Company can borrow up to $8.0
million conditional upon meeting certain financial covenants, including
maintaining quarterly profitability and specific financial covenants. As of
September 30, 1998, there were no borrowings outstanding under the line of
credit agreement. The Company has financed a significant portion of its
machinery and equipment through capital equipment leases including an additional
equipment financing in the amount of $1.4 million during the nine months ended
September 30, 1998. At September 30, 1998, approximately $4.1 million was
outstanding under various capital equipment leasing agreements.

   As of September 30, 1998, the Company had working capital, defined as current
assets less current liabilities, of approximately $38.1 million, which was an
increase of approximately $8.0 million over December 31, 1997. The Company
generated $11.9 million from operating activities during the nine months ended
September 30, 1998, reflecting net income of $8.5 million, depreciation of $2.3
million and $1.1 million provided by the net change in working capital items.
The net change in working capital items primarily reflects an increase in
inventory of $1.7 million as part of the Company's program to provide shorter
lead times to its customers, a decrease in accounts payable of $1.3 million, an
increase in other liabilities of $2.0 million, and an increase of $1.4 million
in deferred revenue.

   The nature of the semiconductor industry, combined with the current economic
environment, make it very difficult for the Company to predict future liquidity
requirements with certainty. However, the Company believes that its existing
cash, cash equivalents and short-term investments, cash generated from
operations and other existing sources of working capital will be adequate to
finance its operations through the next twelve months.

NEW ACCOUNTING STANDARDS

   In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards (SFAS) No. 130, "Reporting Comprehensive
Income," which establishes standards for reporting and presentation of
comprehensive income. SFAS No. 130 requires companies to report a new measure of
income. The Company adopted SFAS No. 130 in the first quarter of 1998.
"Comprehensive Income" is to include foreign currency translation gains and
losses and other unrealized gains and losses that have historically been
excluded from net income and reflected instead in equity. The adoption of  SFAS
No. 130 did not have a material impact on the Company's financial statements.

   In June 1997, the Financial Accounting Standards Board issued SFAS No. 131,
"Disclosures About Segments of an Enterprise and Related Information," which
requires companies to report financial and descriptive information about its
reportable operating segments. SFAS No. 131 will be adopted by the Company in
its 1998 annual consolidated financial statements. The Company anticipates that
SFAS No. 131 will not have a material impact on its financial statements.

                                       13
<PAGE>
 
FACTORS THAT MAY AFFECT FUTURE RESULTS OF OPERATIONS

   The Company's future results of operations are dependent upon a number of
factors, including those described below. For a complete description of such
factors, see the Company's Form 10-K/A for the year ended December 31, 1997.

   Unpredictable and Fluctuating Operating Results.   The Company's quarterly
net revenues and operating results have varied significantly in the past, are
difficult to forecast, are subject to numerous factors both within and outside
of the Company's control, and may fluctuate significantly in the future.
Although the Company was profitable in the third quarter of 1998, there can be
no assurance that the Company will continue to be profitable in future periods.
The Company believes that period-to-period comparisons are not necessarily
meaningful and should not be relied upon as indicative of future operating
results.

   Factors which may affect the Company's net revenues and operating results
include the timing and volume of orders received by the Company; competitive
pressures on selling prices; the volume and timing of orders placed by the
Company with its foundries; the availability of raw materials; fluctuations in
manufacturing yields, whether resulting from the transition to new foundries or
from other factors; changes in product mix including the impact of new product
introduction, such as the Tiny Switch ICs, on existing products; the Company's
ability to develop and bring to market new products and technologies on a timely
basis; introduction of products and technologies by the Company's competitors;
market acceptance of the Company's and its customers' products; the timing of
investments in research and development and sales and marketing; the Company's
patent infringement claim against Motorola; cyclical semiconductor industry
conditions; fluctuations in exchange rates, particularly exchange rates between
the U.S. dollar and the Japanese yen; changes in the international business
climate; and economic conditions generally.

   Many computer systems were not designed to handle any dates beyond the year
1999, and therefore, computer hardware and software for virtually all businesses
will need to be modified prior to the year 2000 in order to remain functional.
The Company is concerned that many enterprises will be devoting a substantial
portion of their information systems spending to resolving this upcoming Year
2000 problem.  This expense may result in spending being diverted from ICs for
use in AC to DC power conversion in the near future.  The Company is still
assessing the impact of the Year 2000 issue on its internal information systems
and has begun, and in many cases completed, corrective efforts in these areas.
The Company has evaluated the functionality of its current products with respect
to any Year 2000 problems and has determined that its current products have no
Year 2000 problems. The Company does not anticipate that addressing the Year
2000 problem for its internal information systems and future products will have
a material impact on its operations or financial results.  However, there can be
no assurance that these costs will not be greater than anticipated, or that
corrective actions undertaken will be completed before any Year 2000 problems
could occur.  The Year 2000 issue could lower demand for the Company's products
while increasing the Company's costs.  These combining factors, while not
quantified, could have a material adverse impact on the Company's financial
results.

   The Company has certain key relationships with suppliers.  If these suppliers
fail to adequately address the Year 2000 issue for the products they provide to
the Company, this could have a material adverse impact on the Company's
operations and financial results.  The Company is still assessing the effect the
Year 2000 issue will have on its suppliers and at this time, cannot determine
the impact it will have. Contingency plans will be developed if it appears the
Company or its key suppliers will not be Year 2000 compliant, and such
noncompliance is expected to have a material adverse impact on the Company's
operations.

   The Company's operating results in a future quarter or quarters are likely to
fall below the expectations of public market analysts or investors. In such an
event, the price of the Company's common stock will likely be materially and
adversely affected. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations."

   Concentration of Applications.   A limited number of applications of the
Company's products, primarily in the cellular phone battery chargers and desktop
PC stand-by markets, currently account for approximately one-half of the
Company's net revenues. The Company expects that its net revenues and operating
results will continue to be substantially dependent upon these markets for the
foreseeable future. The cellular phone and desktop PC markets 

                                       14
<PAGE>
 
can be highly cyclical and have been subject to significant economic downturns
at various times, characterized by diminished product demand, accelerated
erosion of average selling prices and production over capacity. The Company may
experience substantial period-to-period fluctuations in future operating results
due to general conditions of these markets. The Company's net revenues and
operating results are subject to many of the risks to which the markets for
these applications are subject, and may also be impacted by technological or
other developments in these markets. While the Company continues its efforts to
enhance the cost effectiveness of TOPSwitch-based switchers, there can be no
assurance that the Company will be successful in its efforts, and, in the
absence of a successful competitive response by the Company, demand for the
Company's products would be materially adversely affected. Similarly, if a
competitor of the Company successfully and cost effectively combines desktop PC
stand-by power supplies with the main PC desktop power supplies prior to such
combination by the Company, demand for the Company's products could be
materially adversely affected.

   Customer Concentration and Competing Products from Customers.   The Company's
end user base is highly concentrated and a relatively small number of OEMs,
directly or indirectly through merchant power supply manufacturers, account for
a significant portion of the Company's net revenues. The Company estimates that
its top ten customers, including distributors which resell to large OEMs and
merchant power supply manufacturers, accounted for approximately 67% of the
Company's net revenues for both of the nine month periods ended September 30,
1998 and 1997. The Company expects that it will continue to be dependent upon a
relatively limited number of customers for a significant portion of its net
revenues in future periods, although no customer is presently obligated either
to purchase a specified amount of products or to provide the Company with
binding forecasts of product purchases for any period. The reduction, delay or
cancellation of orders from one or more of the Company's significant customers,
or the discontinuance of the Company's products by the Company's end users,
could materially and adversely affect the Company's business, financial
conditions and results of operations. The Company has experienced such effects
in the past and there can be no assurance that any of the Company's customers
will not reduce, cancel or delay orders in the future.

   Dependence on Wafer Suppliers.   The Company outsources all of its
semiconductor manufacturing and product assembly except for testing and
finishing. The Company has supply arrangements for the production of wafers with
Matsushita Electronics Corporation and an affiliate of Matsushita ("MEC"), and
OKI Electric Industry Co., Ltd. ("OKI"). Although certain aspects of the
Company's relationships with MEC and OKI are contractual, many important aspects
of these relationships depend on the continued cooperation of these strategic
partners and, in many instances, the parties' course of conduct deviates from
the literal provisions of the contracts. There can be no assurance that the
Company and its strategic partners will continue to work together successfully
in the future or that either MEC or OKI will not seek an early termination of
its wafer supply agreement with the Company.

   The Company's wafer supply contract with OKI was renewed on October 1, 1998.
The term of this contract is for five years, expiring in September 2003. There
can be no assurance that the Company at that time will be able to reach an
agreement with OKI to extend the term of its wafer supply agreement. The
Company's wafer supply contract with MEC terminates in June 2000. There can be
no assurance that the Company will be able to reach an agreement with MEC to
extend the term of its wafer supply agreement. The Company's failure to reach,
in a timely fashion, an extension of either agreement or to enter into an
arrangement with another manufacturer, could result in material disruptions in
supply. Certain contractual provisions limit the conditions under which the
Company can enter into such arrangements with other Japanese manufacturers or
their subsidiaries during the term of the agreement with MEC. In the event of a
supply disruption with OKI or MEC, if the Company were unable to qualify
alternative manufacturing sources for existing or new products in a timely
manner or if such sources were unable to produce wafers with acceptable
manufacturing yields, the Company's business, financial condition and operating
results would be materially and adversely affected.

   From time to time in the past, the Company has been unable to fully satisfy
customer requests for its products. Any significant disruptions in deliveries of
the Company's products to its customers would materially and adversely affect
the Company's business and operating results.

   Risks of Outside Manufacturing and Assembly; Sole Source Risks.   The Company
depends on MEC and OKI to produce wafers, and independent subcontractors to
assemble finished products, at acceptable yields and to deliver them to the
Company in a timely manner. To the extent the wafer foundries do not achieve
acceptable manufacturing yields or they experience product shipment delays, the
Company's financial condition or results of 

                                       15
<PAGE>
 
operations would be materially adversely affected. The Company's IC assembly
process requires a sole source high-voltage molding compound that is difficult
to process. This compound and its required processes, together with the other
non-standard materials and processes needed to assemble the Company's products,
require a more exacting level of process control than normally required for
standard packages. Unavailability of the sole source compound or problems with
the assembly process can materially adversely affect yields and cost to
manufacture. Good production yields are particularly important to the Company's
business and financial results, including its ability to meet customers' demand
for products and to maintain profitability. As the Company continues to increase
its product output, there can be no assurance that the Company's foundries and
assemblers will not experience a decrease in yields. Moreover, there can be no
assurance that acceptable yields will be maintainable in the future.

   Risks of International Sales.   Sales to customers outside of the United
States represented 82% and 81% for the nine months ended September 30, 1998 and
1997, respectively. These sales involve a number of inherent risks, including
imposition of government controls, currency exchange fluctuations, potential
insolvency of international distributors and representatives, reduced protection
for intellectual property rights in some countries, the impact of recessionary
environments in economies outside the United States, political instability,
generally longer receivables collection periods, tariffs and other trade
barriers and restrictions, and the burdens of complying with a variety of
foreign laws. Furthermore, because substantially all of the Company's foreign
sales are denominated in U.S. dollars, increase in the value of the dollar would
increase the price in local currencies of the Company's products in foreign
markets and make the Company's products relatively more expensive and less price
competitive than competitors' products that are priced in local currencies. The
Company is exposed to additional risks to the extent that the products of its
customers are subject to foreign currency or other international risks. There
can be no assurance that these factors will not have an adverse effect on the
Company's future international sales and, consequently, on the Company's
business, financial condition or operating results.

   New Products and Technological Change.   The Company's future success depends
in significant part upon its ability to develop new ICs for high-voltage power
conversion for existing and new markets, to introduce such products in a timely
manner and to have such products selected for design into products of leading
manufacturers. The development of these new devices is highly complex, and from
time to time the Company has experienced delays in completing the development of
new products. There can be no assurance that the Company will be able to adjust
to changing market demands as quickly and cost-effectively as necessary to
compete successfully. Furthermore, there can be no assurance that the Company
will be able to introduce new products in a timely and cost-effective manner or
in sufficient quantities to meet customer demand or that such products will
achieve market acceptance. The Company's or its customers' failure to develop
and introduce new products successfully and in a timely manner would materially
adversely affect the Company's business, financial condition or operating
results.

   Lengthy Sales Cycle.   The Company's products are generally incorporated into
a customer's products at the design stage. However, customer decisions to use
the Company's products (design wins), which can often require significant
expenditures by the Company without any assurance of success, often precede
volume sales, if any, by a year or more. If a customer decides at the design
stage not to incorporate the Company's products into its product, the Company
will not have another opportunity for a design win with respect to that product
for many months or years. Because of such a lengthy sales cycle, the Company may
experience a delay between increasing expenses for research and development and
its sales and marketing efforts and the generation of volume production
revenues, if any, from such expenditures. Failure by the Company to timely
develop and introduce products that are incorporated into its customers'
products could have a material adverse effect on the Company's business,
financial condition or results of operations.

   Product Quality, Performance and Reliability.   The fabrication and assembly
of ICs is a highly complex and precise process. The Company expects that its
customers will continue to establish demanding specifications for quality,
performance and reliability that must be met by the Company's products. ICs as
complex as those offered by the Company often encounter development delays and
may contain undetected defects or failures when first introduced or after
commencement of commercial shipments. The Company has from time to time in the
past experienced product quality, performance or reliability problems. There can
be no assurance that defects or failures relating to the Company's product
quality, performance and reliability will not occur in the future or that such
defects or failures will not have a material adverse effect on the Company's
operating results.

                                       16
<PAGE>
 
   Competition.   The high-voltage power supply industry is intensely
competitive and characterized by extreme price sensitivity. Accordingly, the
most significant competitive factor in the target markets for the Company's
products is cost effectiveness. The Company's products face competition from
alternative technologies, primarily discrete switchers. The Company believes
that at current pricing, the TOPSwitch families of products offer favorable cost
performance benefits compared to discrete switchers in many high-volume
applications. However, any significant erosion in the price of discrete
components, such as high voltage Bipolar and MOSFET transistors and PWM
controller ICs, could adversely affect the cost effectiveness of the TOPSwitch
products. Also, older alternative technologies to switchers are more cost-
effective than switchers that use the Company's TOPSwitch products in certain
power ranges for certain applications. In the Company's  continuing  efforts to
enhance the cost effectiveness of its solutions in the lower power range for
power supplies, it announced the TinySwitch family of ICs in September 1998.
TinySwitch ICs are primarily targeted at the sub 10 watt power range and
incorporate the Company's new EcoSmart technology which is designed to reduce
energy leakage from power supplies. There can be no assurance that the Company
will be successful in these efforts.

   In addition, the Company faces competition from MEC, which currently
manufactures and sells its versions of the Company's TOPSwitch families of
products under the right (exclusive during the term of the contract as to other
Japanese companies, except OKI, and their subsidiaries) granted by the Company
to manufacture and sell products using the Company's technology to Japanese
companies worldwide and to subsidiaries of Japanese companies located in Asia.
Beginning in April 1997, the Company agreed not to sell its products to new
customers in Japan.  The Company's TOPSwitch product families have also begun to
meet additional competition from hybrid and single high-voltage ICs similar to
TOPSwitch. These competing products are being developed or have been developed
and are being produced by companies such as Motorola, STMicroelectronics,
Samsung and Sanken. The Company expects competition to increase as Motorola,
STMicroelectronics, Samsung, Sanken and possibly other companies develop and
introduce new products.

   The Company's ability to compete in its target markets also depends on such
factors as the timing and success of new product introductions by the Company
and its competitors, the pace at which the Company's customers incorporate the
Company's products into their end user products, availability of wafer
fabrication and finished good manufacturing capability, availability of adequate
sources of raw materials, protection of Company products by effective
utilization of intellectual property laws and general economic conditions. There
can be no assurance that the Company's products will continue to compete
favorably or that the Company will be successful in the face of increasing
competition from new products and enhancements introduced by existing
competitors or new companies entering this market. Failure of the Company to
compete successfully in the high-voltage power supply business would materially
and adversely affect the Company's business, financial condition and results of
operations.

   Dependence on Proprietary Technology.   The Company's future success depends
in part upon its ability to protect its intellectual property, including
patents, trade secrets, and know-how, and to continue its technological
innovation. There can be no assurance that the steps taken by the Company to
protect its intellectual property will be adequate to prevent misappropriation
or that others will not develop competitive technologies or products.

   The semiconductor industry is characterized by frequent litigation regarding
patent and other intellectual property rights. While the Company has not
received formal notice of any infringement of the right of any third party,
questions of infringement in the semiconductor field involve highly technical
and subjective analyses. Litigation may be necessary in the future to enforce
the Company's patents and other intellectual property rights, to protect the
Company's trade secrets, to determine the validity and scope of the proprietary
rights of others, or to defend against claims of infringement or invalidity, and
there can be no assurance that the Company would prevail in any future
litigation. In addition, the laws of certain foreign countries in which the
Company's technology is or may in the future be licensed may not protect the
Company's intellectual property rights to the same extent as the laws of the
United States, thus increasing the possibility of infringement of the Company's
intellectual property.

   Motorola Litigation.   In July 1998, the Company filed a complaint for patent
infringement in the U.S. District Court, Northern District of California against
its largest end user, Motorola. In August 1998, the Company voluntarily
dismissed that complaint, and filed a new complaint in the U.S. District Court,
District of Delaware, alleging that Motorola has infringed and continues to
infringe on two of the Company's circuit patents. The Company seeks, among
other things, an order enjoining Motorola from infringing on the Company's
patents and an award for damages resulting from the alleged infringement. In
October 1998, Motorola asserted various

                                       17
<PAGE>
 
counterclaims against the Company alleging that the Company is infringing on
certain of Motorola's patents. The Company believes that Motorola's
counterclaims are without merit and intends to vigorously defend itself against
such claims.

   Litigation may be necessary to resolve the claims asserted by the Company
against Motorola, and any claims which Motorola may assert in the future against
the Company, and to defend, enforce and protect the Company's intellectual
property rights. There can be no assurance that the Company will prevail in any
litigation with Motorola, or any other party. Any such litigation, whether or
not determined in the Company's favor or settled by the Company, would be costly
and would divert the efforts and attention of the Company's management and
technical personnel from normal business operations, which could have a material
adverse effect on the Company's business, financial condition and results of
operations. In addition, any litigation between the Company and Motorola could
delay the Company's ability to have its products incorporated into a customer's
products at the design stage. Delays in customers' decisions to use the
Company's products could have a material adverse effect on the Company's
business, financial condition and results of operations. Adverse determinations
in any litigation could result in the loss of certain of the Company's
proprietary rights, subject the Company to significant liabilities, require the
Company to seek licenses from third parties, or prevent the Company from
manufacturing and selling certain of its products or licensing its technology,
any of which could have a material adverse effect on the Company's business,
financial condition and results of operations.

   Dependence on Key Personnel.   The Company's success depends to a significant
extent upon the continued service of its executive officers and other key
management and technical personnel, and on its ability to continue to attract,
retain and motivate qualified personnel, such as experienced systems
applications engineers. The loss of the services of one or more of the Company's
engineers, executive officers or other key personnel or the Company's inability
to recruit replacements for such personnel or to otherwise attract, retain and
motivate qualified personnel could have a material adverse effect on the
Company's business, financial condition or operating results. The Company does
not have long-term employment contracts with any of its employees.

   Management of Growth.   The Company has experienced a period of rapid growth
and expansion which has placed, and continues to place, a significant strain on
its resources. To accommodate this growth, the Company will be required to
implement a variety of new and upgraded operational and financial systems,
procedures and controls, including the improvement of its accounting and other
internal management systems, all of which may require substantial management
efforts. There can be no assurance that such efforts can be accomplished
successfully.

   Year 2000 Compliance.   The Company is aware of the issues associated with
the programming code in existing computer systems and software products as the
year 2000 approaches. Computer programs that are written using two digits rather
than four digits to define the applicable year, may have date-sensitive software
and, for instance, may recognize a date using 00 as the year 1900 rather than
the year 2000 ("Date Code Dependency"). Systems that do not properly recognize
such information could generate erroneous data or cause a system to fail. The
Company is in the process of defining costs, issues and uncertainties associated
with making the Company's internal-use software applications compliant with the
Year 2000. In general, the Company expects to resolve the Year 2000 issues
through planned replacement upgrades of its software applications.

   The Company has evaluated the functionality of its products with respect to
Year 2000 Date Code Dependencies and has determined that its products have no
Date Code Dependencies. The Company's ICs are installed by third party
manufacturers in their products. Accordingly, if any of those products have Date
Code Dependencies, there could be unforeseen Year 2000 compliance problems with
some of the Company's customers products, which could result in such customers
ordering less products from the Company. Any such decrease in customers' orders
would have a material adverse effect on the Company's operating results and
financial condition. In addition, some of the Company's customers may experience
Date Code Dependency problems that result in disruption of their internal
operations, which could delay their purchases of the Company's products, and
result in a material adverse effect on the Company's operating results and
financial condition.

   The Company also is subject to risks to the extent that suppliers of
products, services and systems to the Company have business systems or products
that have Date Code Dependencies. Where practicable, the Company will attempt to
mitigate its risks with respect to the failure of suppliers to be Year 2000
compliant. In the event that suppliers are not Year 2000 compliant, the Company
will seek to qualify alternative sources of supplies. In the event the Company's
current suppliers are not Year 2000 compliant, or the Company is unable to
qualify in a timely 

                                       18
<PAGE>
 
manner suppliers that are Year 2000 compliant, the Company's
results of operations and financial condition could be materially adversely
affected. Additionally, litigation may arise from situations in which the
Company has minimum purchase commitment contracts with suppliers that are not
Year 2000 compliant. If any such third party suppliers are unable to provide the
Company with products, services or systems that meet Year 2000 requirements in a
timely manner, the Company's operating results and financial condition could be
materially adversely affected.

   Management does not expect the Year 2000 issues to have a material impact on
the Company's business or future results of operations. Management also believes
that the total costs to become Year 2000 compliant will be immaterial to the
Company's financial condition or results of operations. However, if the planned
replacement upgrades to its software applications are not made, or are not
completed on a timely basis, the Year 2000 issues could have a material impact
on the operations of the Company. The Company currently expects that its
internal-use software applications will be Year 2000 compliant by no later than
June 1999, before any Date Code Dependencies within the Company's internal
systems would have a material adverse impact on the Company's operations. The
cost of the project and the date on which the Company believes it will complete
the Year 2000 upgrades are based on management's best estimates, which were
derived utilizing numerous assumptions of future events, including the
availability of certain resources and other factors.  However, there can be no
guarantee that these estimates will be achieved and actual results could differ
materially from those anticipated. Specific factors that might cause such
material differences include, but are not limited to, the availability and cost
of personnel trained in this area, the ability to locate and correct all
relevant computer codes, and similar uncertainties.

   Year 2000 compliance is an issue for virtually all businesses, whose computer
systems and applications may require significant hardware and software upgrades
or modifications. Companies owning and operating such systems may plan to devote
a substantial portion of their information systems spending to fund such
upgrades and modifications and divert spending away from ICs for use in AC to DC
power conversion. Such changes in customers' spending patterns could have a
material adverse impact on the Company's sales, operating results and financial
condition.

   Possible Volatility of Stock.   The stock market has from time to time
experienced significant price and volume fluctuations which have particularly
affected the market prices of the stock of high technology companies, and which
may be unrelated to the operating performance of particular companies. Since its
initial public offering in December 1997, the market price of the Company's
common stock has ranged from a high of $18.50 to a low of $7.75 per share.
Factors such as technology and product announcements by the Company or by
competitors, disputes relating to patents and proprietary rights, and failures
or delays in the Company's development program may have a significant effect on
the market price of the Company's common stock.

                                       19
<PAGE>
 
                          PART II.  OTHER INFORMATION

ITEM 1.   LEGAL PROCEEDINGS

   In July 1998, the Company filed a complaint for patent infringement in the
U.S. District Court, Northern District of California against its largest end
user, Motorola. In August 1998, the Company voluntarily dismissed that
complaint, and filed a new complaint in the U.S. District Court, District of
Delaware, alleging that Motorola has infringed and continues to infringe on two
of the Company's circuit patents. The Company seeks, among other things, an
order enjoining Motorola from infringing on the Company's patents and an award
for damages resulting from the alleged infringement. In October 1998, Motorola
asserted various counterclaims against the Company alleging that the Company
is infringing on certain of Motorola's patents. The Company believes that
Motorola's counterclaims are without merit and intends to vigorously defend
itself against such claims.

   Litigation may be necessary to resolve the claims asserted by the Company
against Motorola, and any claims which Motorola may assert in the future against
the Company, and to defend, enforce and protect the Company's intellectual
property rights. There can be no assurance that the Company will prevail in any
litigation with Motorola, or any other party. Any such litigation, whether or
not determined in the Company's favor or settled by the Company, would be costly
and would divert the efforts and attention of the Company's management and
technical personnel from normal business operations, which could have a material
adverse effect on the Company's business, financial condition and results of
operations. In addition, any litigation between the Company and Motorola could
delay the Company's ability to have its products incorporated into a customer's
products at the design stage. Delays in customers' decisions to use the
Company's products could have a material adverse effect on the Company's
business, financial condition and results of operations. Adverse determinations
in any litigation could result in the loss of certain of the Company's
proprietary rights, subject the Company to significant liabilities, require the
Company to seek licenses from third parties, or prevent the Company from
manufacturing and selling certain of its products or licensing its technology,
any of which could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
ITEM 2.  CHANGES IN SECURITIES AND USE OF PROCEEDS

         None.

ITEM 3.  DEFAULTS UPON SENIOR SECURITIES

         None.

ITEM 4.  SUBMISSION OF MATTERS TO VOTE OF SECURITY HOLDERS

         None

ITEM 5.  OTHER INFORMATION

         None.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

    a.   Exhibits.

            The following exhibits are attached hereto and filed herewith:

            10.21* Wafer Supply Agreement  between the Company and OKI, dated
                   October 1, 1998.
             
            10.22  Master Equipment Lease Agreement between the Company and
                   Metlife Capital Limited Partnership, dated July 31, 1998.

            27.1   Financial Data Schedule.

               *   This Exhibit has been filed separately with the Commission
                   pursuant to an application for confidential teatment. The
                   confidential portions of this Exhibit have been omitted and
                   are marked by an asterisk.

      b. Reports on Form 8-K.

         None.

                                       20
<PAGE>
 
                                   SIGNATURES
                                        
   PURSUANT TO THE REQUIREMENTS OF SECTION 13 OR 15(d) OF THE SECURITIES
EXCHANGE ACT OF 1934, THE REGISTRANT HAS DULY CAUSED THIS REPORT TO BE SIGNED ON
ITS BEHALF BY THE UNDERSIGNED, THEREUNTO DULY AUTHORIZED.



                                  POWER INTEGRATIONS, INC.


                                            /s/   ROBERT G. STAPLES
Dated:   November 10, 1998        By: ____________________________________
                                               Robert G. Staples
                                           Chief Financial Officer

                                       21

<PAGE>
 
                                                                   EXHIBIT 10.21

                             WAFER SUPPLY AGREEMENT
                             ----------------------


  THIS AGREEMENT, made and entered into as of this 1st day of October, 1998
(the "Effective Date") by and between:

     (1)  Power Integrations, Inc., a Delaware corporation having its principal
          place of business at 477 N. Mathilda Ave; Sunnyvale, CA U.S.A. ("PI");
          and

     (2)  OKI ELECTRIC INDUSTRY CO., LTD., a Japanese corporation having its
          registered head office at 7-12, Toranomon 1-chome, Minato-ku, Tokyo
          105-8460, Japan ("OKI").



                                WITNESSETH:

  WHEREAS, OKI is engaged in providing wafer foundry services for IC companies;
and

  WHEREAS, PI is engaged in the design, development, marketing and sale of
various IC products for use in power source applications; and

  WHEREAS, PI desires to acquire from OKI fabrication and supply of wafers of
certain IC products, and OKI is willing to supply such wafers to PI within the
limitation of available production capacity of OKI.

  NOW, THEREFORE, in consideration of the above premises and the mutual
covenants of the parties contained herein, PI and OKI hereby agree as follows:


Article 1.  (Definitions)
- ---------    ----------- 

  When used throughout this Agreement, each of the following terms shall have
the meaning indicated below:

1.1  PRODUCTS:  Any and all IC products of PI which will be processed in
     ---------                                                          
     accordance with the PI PROCESS.

1.2  WAFERS: Non-probed four (4) and/or five (5) inch silicon wafers
     -------                                                        
     produced during the PILOT PRODUCTION and VOLUME PRODUCTION which meet the
     COMMON

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     SPECIFICATION.

1.3  PILOT PRODUCTION:  The production by OKI of WAFERS for the purpose of
     -----------------                                                    
     evaluation by PI.

1.4  VOLUME PRODUCTION:  The production by OKI of WAFERS for the volume
     ------------------                                                
     production of PRODUCTS.

1.5  PI PROCESS:  PI's process technologies, which are implemented in the
     -----------                                                         
     OKI wafer fabrication facility to produce the WAFERS, and of which the
     detailed specification is specified in the COMMON SPECIFICATION plus any
     improvements made by PI or jointly by PI and OKI during the term of the
     Agreement.

1.6  OKI PROCESS:  OKI's process technologies developed exclusively by OKI
     ------------                                                         
     and implemented in the OKI wafer fabrication facility to produce the
     WAFERS.

1.7  COMMON SPECIFICATION:  The specifications for the production, delivery
     ---------------------                                                 
     and acceptance of the WAFERS which are defined in the EXHIBIT C attached
     hereto.

1.8  INDIVIDUAL SALES CONTRACTS:  Individual contracts of sale and purchase of
     ---------------------------                                              
     the WAFERS that will be concluded between OKI and PI pursuant to this
     Agreement.  INDIVIDUAL SALES CONTRACTS are only for the purposes of
     establishing the quantity, delivery dates, and pricing of WAFERS, and no
     other terms and conditions stated in any INDIVIDUAL SALES CONTRACTS have
     any force or effect.  The terms and conditions of this Agreement apply to
     all INDIVIDUAL SALES CONTRACTS.

1.9  LWS AGREEMENT:  The Licensing and Wafer Supply Agreement, dated June 18,
     --------------                                                          
     1993, between OKI and PI, including all amendments.

1.10 SUBSIDIARY:  Any corporation, company or other entity in which OKI or PI,
     -----------                                                              
     as the case may be, owns and/or controls, directly or indirectly, now or
     hereafter, more than fifty percent (50%) of the outstanding shares of stock
     entitled to vote for the election of directors or their equivalents
     regardless of the form thereof (other than any shares of stock whose voting
     rights are subject to restriction); provided, however, that any entity
     which would be a SUBSIDIARY by reason of the foregoing shall be considered
     a SUBSIDIARY only so long as such ownership or control exists.

1.11 OKI:  OKI and any of its SUBSIDIARIES unless otherwise expressly provided.
     ----                                                                      

1.12 PI:  PI and any of its SUBSIDIARIES unless otherwise expressly provided.
     ---                                                                     

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1.13 CONFIDENTIAL INFORMATION:  Technical information, or other non-public
     -------------------------                                            
     information relating to PI and OKI, whether in a man-readable or machine-
     readable form and whether recorded on paper, tape, diskette or any other
     media, which is disclosed by the disclosing party to the receiving party,
     and (i) which is designated in writing, by appropriate legend, as
     confidential or, (ii) if disclosed orally is identified as confidential
     information at the time of disclosure and a summary of which is confirmed
     in writing within thirty (30) days after oral disclosure and designated, by
     appropriate legend, as confidential.  Not withstanding the foregoing, all
     information generated by the activities and actions of OKI under this
     Agreement on PI's behalf or any information including all PI INTELLECTUAL
                                                               ---------------
     PROPERTY received from PI by OKI to effect the terms of this Agreement
     --------                                                              
     shall also be considered PI's CONFIDENTIAL INFORMATION unless explicitly
     agreed to be exempted by PI in writing.

1.14 OKI IMPROVEMENTS:  Any modification or improvement to the OKI PROCESS or
     -----------------                                                       
     the PI PROCESS, developed exclusively by OKI, during the term of the
     Agreement and all OKI improvements under the LWS Agreement.

1.15 JOINT IMPROVEMENTS:  Any and all enhancements, modifications, derivative
     ------------------                                                      
     works, improvements and/or changes made by OKI in conjunction with PI to
     the PI PROCESS, the COMMON SPECIFICATION, the MASK TOOLING SETS, and/or the
     PI CONFIDENTIAL INFORMATION.

1.16 MASK TOOLING SETS:  Those MASK TOOLING SETS delivered by PI to OKI pursuant
     ------------------                                                         
     to this Agreement.

1.17 PI INTELLECTUAL PROPERTY:  The PI PROCESS, the COMMON SPECIFICATION, the
     ------------------------                                                
     MASK TOOLING SETS, the JOINT IMPROVEMENTS, and all INTELLECTUAL PROPERTY
     RIGHTS in the foregoing.

1.18 INTELLECTUAL PROPERTY RIGHTS:  Copyrights, patents, trade secrets, moral
     ----------------------------                                            
     rights, know-how and other intellectual or proprietary rights of any kind.

Article 2.  (Foundry Commitment and Forecasts)
- ---------    -------------------------------- 

2.1  Both OKI and PI desire to enter into a relationship under which they will
     act in good faith and cooperate to achieve their objectives to their mutual
     benefit as set forth in this Agreement.

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2.2  OKI agrees to commit to PI the foundry capacity ("FOUNDRY CAPACITY")
     set forth in EXHIBIT A attached hereto until March 31, 1999.  Each January,
     beginning in 1999, OKI and PI will meet to review PI `s non-binding twelve
     (12) month forecast of wafer orders ("PI ANNUAL FORECAST") for the upcoming
     OKI fiscal year (April 1 through March 31 of each year) and OKI's FOUNDRY
     CAPACITY for the upcoming OKI fiscal year. For the period beginning on
     April 1st, 1999 and annually on April 1st thereafter during the term of
     this Agreement, OKI will commit a FOUNDRY CAPACITY for the current OKI
     fiscal year, at the OKI plant specified per Section 3.3 , in an amount no
     less than * Percent (*%) of PI's total wafer purchases during the previous
     OKI fiscal year,  and PI will submit the PI ANNUAL FORECAST on April 1st.
     During the OKI fiscal year, OKI shall accept up to a * (*%) upside request
     over the current FOUNDRY CAPACITY upon a three (3) month written advance
     notice from PI.  OKI can request PI to negotiate to reduce the committed
     FOUNDRY CAPACITY, for the then current OKI fiscal year,  if OKI and PI
     determine that PI will  not order at least *% of the PI ANNUAL FORECAST.
     Any negotiated reduction in FOUNDRY CAPACITY must be agreed to by PI in
     writing.

2.3  During the term of this Agreement, PI shall provide OKI on or before a
     mutually agreed  day of each calendar month a written forecast ("PI MONTHLY
     FORECAST") of the quantity of the WAFERS of each PRODUCT to be manufactured
     and delivered (if any) within the period of the following six (6) calendar
     months which shall fall within the effective term of this Agreement,
     provided that such forecast shall be in conformity with the FOUNDRY
     CAPACITY.

2.4  PI must order at least the quantity of WAFERS forecasted in the first
     two (2) months of the PI MONTHLY FORECAST unless OKI agrees to any change.
     PI may revise the quantity for each of the last four (4) months of each PI
     MONTHLY FORECAST without penalty or charge.

2.5  In the event of any direct or indirect governmental intervention in
     Japan or the United States or in any country of destination of the WAFERS
     purchased by PI, which intervention may virtually or legally render
     infeasible supply of the full quantity of the WAFERS ordered by PI, then
     OKI shall be obligated to supply only such quantity as may 

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     feasibly and legally be supplied without any liability to PI and PI will
     have the right to terminate this agreement without liability, effective
     upon written notice to OKI.

2.6  At the request of OKI, PI and OKI shall discuss allocating the
     production of the WAFERS from one plant of OKI to another.



Article 3.  (Sale and Purchase of WAFERS; INTELLECTUAL PROPERTY RIGHTS)
- ---------    --------------------------------------------------------- 

3.1  As implementation of the foundry services provided in the preceding
     Article, PI shall purchase from OKI, and OKI shall sell to PI, those WAFERS
     ordered pursuant to the terms and conditions of this Agreement, which shall
     be non-probed WAFERS.

3.2  Subject to the provisions of Section 3.1 above and 5.2 below, PI shall
     submit to OKI a purchase order for the WAFERS which shall be substantially
     in line with the binding forecast provided for in Section 2.4 above.  Once
     submitted, such purchase order shall be irrevocable except as set forth in
     Section 2.4 and 2.5 above.  All purchase orders shall be subject to
     acceptance by OKI through issuance of a written confirmation within five
     (5) business days of receipt of the purchase order. Upon such written
     confirmation, the terms of the purchase order and confirmation relating to
     total quantity, delivery time and pricing shall constitute a binding
     INDIVIDUAL SALES CONTRACT which incorporates all of the terms and
     conditions of this Agreement except to the extent expressly modified by the
     INDIVIDUAL SALES CONTRACT.  The mix of PRODUCTS and the quantity of WAFERS
     allocated per each of the PRODUCTS in any INDIVIDUAL SALES CONTRACT can be
     modified at any time, prior to the week the WAFERS ordered pursuant to such
     Individual Sales Contract will be started, by PI with confirmation from OKI
     so long as the total quantity of all WAFERS is not less.

3.3  The WAFERS sold hereunder shall be processed at OKI's * plant or other
     plants of OKI as mutually agreed in writing by OKI and PI.

3.4  The sale and purchase of the WAFERS may be made between PI and OKI or
     any of their respective SUBSIDIARIES pursuant to the terms and conditions
     of this Agreement.

3.5  PI is and shall remain the sole and exclusive owner of all right, title
     and interest in the PI INTELLECTUAL PROPERTY.  Subject to all of the terms
     and conditions of this agreement, PI grants OKI a limited, non-exclusive
     license in the PI INTELLECTUAL 

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     PROPERTY for the sole purpose of using it internally to manufacture WAFERS
     for PI in accordance with the terms and conditions of this Agreement. OKI
     may not use the PI INTELLECTUAL PROPERTY for any other purpose or license
     it to any party, unless a separate written agreement for any such rights is
     executed by the parties.

3.6  OKI hereby does and will irrevocably and unconditionally transfer and
     assign to PI all of OKI's right, title and interest worldwide in the JOINT
     IMPROVEMENTS.  OKI will promptly disclose in writing all OKI IMPROVEMENTS
     to PI promptly upon their creation.  OKI shall take all reasonable actions,
     at PI's expense, to assist PI in perfecting and enforcing its rights in the
     JOINT IMPROVEMENTS.  Such actions shall include but not be limited to
     execution of assignments, patent applications and other documents.  Subject
     to all of the terms and conditions of this agreement, PI hereby grants to
     OKI a non-exclusive, irrevocable, perpetual, royalty-free, non-
     transferable, worldwide, right and license, under all  INTELLECTUAL
     PROPERTY RIGHTS to use, modify, reproduce, (but sub-license only to an OKI
     SUBSIDIARY) the JOINT IMPROVEMENTS for OKI's internal use only.

3.7  In the event that any portion of Section 3.6 is declared invalid or
     illegal according to any applicable law, (a) OKI hereby waives and agrees
     never to assert such rights, including any moral rights or similar rights,
     against PI or PI's licensees and (b) the parties hereby modify such
     portion, effective upon such declaration, in such manner as shall secure
     for PI an exclusive, irrevocable, perpetual, worldwide, fully paid and
     royalty-free license under all INTELLECTUAL PROPERTY RIGHTS, with rights to
     sublicense through multiple levels of sublicensees, to use, modify,
     reproduce, create derivative works of, distribute, publicly perform and
     publicly display by all means now known or later developed, such rights in
     the JOINT IMPROVEMENTS to the maximum extent permitted by applicable law.

3.8  OKI shall be the sole and exclusive owner of all right, title and
     interest in the OKI IMPROVEMENTS.  OKI hereby grants to PI a non-exclusive,
     irrevocable, perpetual, royalty-free, non-transferable, worldwide, right
     and license, under all  INTELLECTUAL PROPERTY RIGHTS to use, modify,
     reproduce, distribute and otherwise exploit in any manner the OKI
     IMPROVEMENTS as part of the PI PROCESS and any modifications 

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     thereto. Without any consent of OKI, PI may sublicense the OKI IMPROVEMENTS
     to PI's SUBSIDIARY so long as the sublicense provides for the protection of
     OKI's Confidential Information on terms not less protective of OKI's rights
     than those set forth the in the Agreement.

3.9  OKI agrees not to use the PI INTELLECTUAL PROPERTY or any license under
     this Agreement in whole or in part or knowledge gained by OKI through
     producing WAFERS for PI to develop an equivalent or competing process or
     other product or service that would compete with PI.



Article 4.  (Mask Tooling Sets)
- ---------    ----------------- 

4.1  The mask tooling sets for WAFERS of any PRODUCT shall be supplied by PI
     to OKI one (1) week before its commencement of the WAFERS fabrication at no
     cost to OKI.  If, upon OKI's examination, the MASK TOOLING SETS are found
     to be defective or not in conformance with the COMMON SPECIFICATION, OKI
     shall immediately notify PI in detail as to such defects or non-conformity,
     and PI shall either provide corrected MASK TOOLING SETS at PI's expense or,
     notwithstanding any other provision of this Agreement,  PI can cancel the
     INDIVIDUAL SALES CONTRACT for the affected WAFERS, without any liability
     except for affected WAFER work in progress ("WIP") and inventory, upon
     written notice to OKI.  The MASK TOOLING SETS shall be and remain PI's
     CONFIDENTIAL INFORMATION.



Article 5.  (Pilot Production and Minimum Order Quantity)
- ---------    ------------------------------------------- 

5.1  PILOT PRODUCTION
     ----------------

     5.1.1  For the PILOT PRODUCTION, PI shall, if PI's desires to, place an
            order with OKI for a minimum of * (*) WAFER starts (one (1) pilot
            lot) or multiples thereof per each PRODUCT.

     5.1.2  The output will be shipped to PI if the WAFERS output is at least *
            percent (*%) of the ordered quantity. If the WAFERS output is less
            than * percent (*%) of ordered quantity, OKI will inform PI of the
            output quantity of the WAFERS and if PI requires to have the
            shortage covered, OKI will re-input the WAFERS to cover 

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            the shortage of quantity at no additional cost to PI.

5.2  VOLUME PRODUCTION
     -----------------

     5.2.1  For the VOLUME PRODUCTION, PI shall place an order with OKI for a
            minimum of * (*) WAFER starts (one (1) lot) or multiples
            thereof per each PRODUCT and OKI will ship monthly orders in
            quantities not less than * percent (*%) of the quantities ordered of
            each PRODUCT.

     5.2.2  The orders of PI for the VOLUME PRODUCTION shall be subject to the
            provisions of Section 3.2 above.



Article 6.  (Delivery)
- ---------    -------- 

6.1  The terms of delivery of the WAFERS shall be FOB Tokyo port or FCA
     Tokyo airport (as such terms are defined in Incoterms 1990).

6.2  The title and risk of loss relating to the WAFERS delivered by OKI to
     PI shall transfer from OKI to PI at such time and point as provided in
     Incoterms 1990 relating to such FOB or FCA terms.  PI shall have the right
     to designate a freight forwarder, subject to OKI's reasonable approval.

6.3  OKI will deliver WAFERS within the number of calendar days after
     receipt of PI's purchase order as specified in the order.  In the event
     that OKI foresees the delay of the delivery schedule of WAFERS, OKI shall
     make a best effort to correct any delay and OKI shall promptly notify PI of
     such delay and submit to PI the new delivery schedule.  PI will have the
     right to cancel, without liability, the INDIVIDUAL SALES CONTRACT for the
     delayed WAFERS if the delay is greater than thirty (30) days.

6.4  OKI shall pack the WAFERS in accordance with packing standards which
     shall be defined in the COMMON SPECIFICATION attached hereto.



Article 7.  (Test and Inspection)
- ---------    ------------------- 

7.1  PI shall conduct incoming inspection according to the COMMON
     SPECIFICATION.  This inspection shall be regarded as final in terms of
     quality, quantity and other conditions of the WAFERS supplied to PI subject
     to OKI's warranty as defined in Section 11.1.

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7.2  PI shall notify OKI of a result of inspection judgment within * (*)
     business days after the date of receipt by PI. Should PI fail to so notify
     within the said * (*) business days, the shipment lot shall be deemed to
     have been accepted by PI. PI will owe OKI payment only for the quantity of
     wafers that have been accepted by PI.

7.3  OKI shall not be held responsible for the defects and failures which
     are attributable to the design, test and assembly by PI of the PRODUCTS.

7.4  OKI shall not be held responsible for the defects, failures and yield
     problems of the non-probed WAFERS if the WAFERS meet the specifications set
     forth in the COMMON SPECIFICATION.



Article 8.  (Process and Specification Changes)
- ---------    --------------------------------- 

8.1. OKI shall notify PI in writing as soon as possible, in advance and in
     accordance with the COMMON SPECIFICATION, of process changes which require
     PI's change in data-base or which would affect the quality, reliability,
     form, fit or function of the PRODUCTS in order to receive PI's prior
     written approval of the process change. PI will have the right to cancel,
     without liability, any INDIVIDUAL SALES CONTRACT affected by the process
     change.

8.2. PI shall have sole responsibility for the control, maintenance,
     distribution and modification of the COMMON SPECIFICATION including but not
     limited to the addition and maintenance of applicable process, inspection,
     quality and procurement specifications. PI will notify OKI of any changes
     to the COMMON SPECIFICATION by amending Exhibit C and attaching the
     relevant specification or documentation. OKI will acknowledge acceptance of
     the COMMON SPECIFICATION in writing and OKI's acceptance of the COMMON
     SPECIFICATION will not be unreasonable withheld. In the case of any issue
     with the COMMON SPECIFICATION, OKI agrees that PI is the ultimate authority
     on the COMMON SPECIFICATION.

PI and OKI shall specify in advance in writing the scope and purpose of any
JOINT IMPROVEMENT project for the purpose of pre-defining to what extent and
specifically which process technology will be considered a JOINT IMPROVEMENT.
OKI's rights under Section 3.6 shall not extend to any process technology not so
defined as a Joint Improvement.

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Article 9.  (Price and Charge)
- ---------    -----------------

9.1  The prices of the WAFERS of each PRODUCT, which are produced both in
     the PILOT PRODUCTION and the VOLUME PRODUCTION are set forth in EXHIBIT B
     attached hereto.  Any modifications thereto must be agreed upon by OKI and
     PI in writing, either as an amendment to EXHIBIT B or as part of an
     INDIVIDUAL SALES CONTRACT. OKI and PI may jointly review and revise the
     WAFERS price within * or upon a material change to the COMMON
     SPECIFICATION.

9.2  In the event of any direct or indirect intervention of the Japanese,
     the United States and/or any other relevant Governments, including the
     legislative, administrative and judicial branches thereof, which may
     virtually or legally disallow a price at which the WAFERS shall be supplied
     under this Agreement, then OKI shall not be obligated to abide by such
     price without any liability to PI and PI will have the right to terminate
     this agreement without liability, effective upon written notice to OKI.



Article 10.  (Payment)
- ----------    ------- 

     Payment for the WAFERS shall be by telephonic transfer * (*) days
     after receipt of invoice and secured by a standby letter of credit to be
     opened at a first class bank acceptable to OKI. OKI agrees to negotiate
     terms or alternate forms of payment as proposed by PI.


Article 11.  (Warranty, Indemnification and Improvements)
- ----------    ------------------------------------------ 

11.1 OKI warrants that the WAFERS sold to PI under this Agreement and any
     Wafers provided to PI under the LWS Agreement within the * (*) months
     before the Effective Date of this Agreement will conform to their agreed
     specifications set forth in COMMON SPECIFICATION attached hereto.  OKI's
     warranty provided in this Section shall not apply in case any non-
     conformity or other defect is attributable to the design, assembly or test
     of PI.  PI shall notify OKI in writing of any such non-conformity or defect
     of said WAFERS within three (3) months after the acceptance of the WAFERS
     by PI per Section 7.2 above.  OKI's sole obligations under this warranty
     are limited to, at PI's option, (i) 

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     replacing or reworking any said WAFERS which shall be returned to OKI's
     manufacturing facility with transportation charges prepaid, or (ii) OKI
     crediting an amount equal to the purchase price of said WAFERS.

11.2 OKI shall defend, indemnify and hold harmless PI, its officers, directors,
     employees and representatives from and against any claim, demand, cause of
     action, debt, or liability, including reasonable attorneys' fees, relating
     to or arising from allegations that the OKI PROCESS, OKI IMPROVEMENTS and
     any OKI contributions to the JOINT IMPROVEMENTS used to produce WAFERS or
     the resulting WAFERS under this Agreement or under the LWS Agreement
     infringes any patent, copyright, trade secret or other right of any kind of
     a third party; provided that OKI is promptly notified in writing of the
     action and is allowed to assume and control the defense.  OKI shall pay all
     damages and costs awarded therein, but shall not be responsible for any
     compromise or settlement made without OKI's consent.

11.3 EXCEPT AS EXPRESSLY STATED HEREIN, NO EXPRESS OR IMPLIED WARRANTIES ARE
     MADE BY OKI RELATING TO THE WAFERS, INCLUDING BUT NOT LIMITED TO WARRANTIES
     OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  PI MAKES NO
     REPRESENTATION OR WARRANTY OF ANY KIND WITH REGARD TO ANY OF THE PI
     INTELLECTUAL PROPERTY.

11.4 PI shall defend, indemnify and hold harmless OKI, its officers, directors,
     employees and representatives from and against any claim, demand, cause of
     action, debt, or liability, including reasonable attorneys' fees, relating
     to or arising from allegations that the PI PROCESS and any PI contributions
     to the JOINT IMPROVEMENTS used to produce WAFERS infringes any patent,
     copyright, trade secret or other right of  any kind of a third party;
     provided that PI is promptly notified in writing of the action and is
     allowed to assume and control the defense.  PI shall pay all damages and
     costs awarded therein, but shall not be responsible for any compromise or
     settlement made without PI's consent.

11.5 OKI shall keep records for three (3) years, notwithstanding the termination
     of this Agreement, of each processed lot manufactured and summaries of
     process monitors. OKI agrees to permit such records to be examined and
     copied by PI, or PI's authorized 

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     representative, upon reasonable prior written notice to OKI during normal
     business hours at OKI's offices. Such records shall be deemed PI's
     CONFIDENTIAL INFORMATION.



Article 12.   (Confidentiality)
- ----------     --------------- 

12.1 The receiving party shall use any CONFIDENTIAL INFORMATION acquired
     from the disclosing party in connection with this Agreement solely for the
     purposes of this Agreement.

12.2 For a period of * after the receipt of the CONFIDENTIAL INFORMATION,
     or during the effective term of this Agreement, which may be longer, the
     receiving party shall use a reasonable standard of care not to publish or
     disseminate the CONFIDENTIAL INFORMATION to any third party, except as
     otherwise provided herein. The receiving party shall have no obligation
     with respect to any CONFIDENTIAL INFORMATION received by it which the
     receiving party shall prove is:

     12.2.1  Published or otherwise available to the public other than by a
             breach of this Agreement or any other agreement by the receiving
             party

     12.2.2  Rightfully received by the receiving party hereunder from a third
             party not obligated under this Agreement or any other agreement,
             and without confidential limitation;

     12.2.3  Known to the receiving party prior to its first receipt of the same
             from the disclosing party;

     12.2.4  Independently developed by the receiving party; or

     12.2.5  Furnished to a third party by the disclosing party without a
             similar restriction on the third party's right of disclosure.

     In the case that Recipient intends to disclose publicly or to a third party
     any CONFIDENTIAL INFORMATION under the previously defined exceptions above,
     the Recipient must first give the disclosing party written notice (30)
     thirty days prior to such a disclosure.  CONFIDENTIAL INFORMATION approved
     in writing by the disclosing party for release by the receiving party
     without a confidentiality agreement designating the information as
     confidential will remove the receiving party's obligations to the
     CONFIDENTIAL INFORMATION.


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12.3 If any CONFIDENTIAL INFORMATION is disclosed pursuant to the requirement or
     request of a governmental or judicial agency or disclosure is required by
     operation of law, such disclosure will not constitute a breach of this
     Agreement, provided that the receiving party shall promptly notify the
     disclosing party and seek a protective order with respect thereto
     reasonably satisfactory to the disclosing party to the extent available
     under applicable law.

12.4 The receiving party shall limit access to the CONFIDENTIAL INFORMATION only
     to such officers and employees of the receiving party who are reasonably
     necessary to implement this Agreement and only to such extent as may be
     necessary for such officers and employees to perform their duties. The
     receiving party shall be liable to cause all of such officers and employees
     to sign a secrecy agreement or to otherwise abide by the secrecy
     obligations provided in this Agreement. The receiving party shall maintain
     records of such officers and employees.

12.5 Confidential Information and all materials including, without limitation,
     documents, drawings, masks, specifications, models, apparatus, sketches,
     designs and lists furnished to the receiving party by and which are
     themselves identified to be or designated in writing to be the property of
     the disclosing party are and shall remain the property of the disclosing
     party and shall be returned to the disclosing party promptly at its
     request, including any copies.

12.6 Any CONFIDENTIAL INFORMATION disclosed by the disclosing party at any time
     under the LWS AGREEMENT shall be deemed for the purpose of this Article to
     be or have been disclosed pursuant to this Agreement as CONFIDENTIAL
     INFORMATION. PI may disclose information with respect to any OKI
     IMPROVEMENTS to the PI PROCESS to one or more third parties as PI
     Confidential Information and covered by a non-disclosure agreement with
     protection equivalent to this Agreement for the sole purpose of having such
     third parties provide PI with design, layout, foundry, assembly and testing
     services.

12.7 The COMMON SPECIFICATION will be CONFIDENTIAL INFORMATION for a period of *
     after the term of this Agreement and OKI agrees to use its best efforts to
     never make public the COMMON SPECIFICATION.


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12.8 PI may request the confidential release of OKI`s CONFIDENTIAL INFORMATION
     to a customer of the PRODUCTS for purposes of such customer's evaluation or
     audit. OKI shall not unreasonably withhold approval of the release.



Article 13.  (Term and Termination)
- ----------    -------------------- 

13.1 This Agreement shall continue in full force and effect for a period of five
     (5) years from the Effective Date, unless earlier terminated as provided
     herein.

13.2 Notwithstanding anything to the contrary in Section 16.11 ("Force
     Majeure"), If any Japanese governmental agency, entity or authority
     requires (including through administrative guidance) any changes to this
     Agreement, PI may terminate this Agreement immediately if the changes are,
     in PI's sole discretion, detrimental to PI's interests or otherwise not
     reasonably acceptable to PI, without liability of any kind.

13.3 In the event that either party has committed a material breach of this
     Agreement, the other party shall have the right to terminate this Agreement
     by giving sixty (60) days' written notice of termination specifying any
     alleged material breach or breaches, such termination to become effective
     at the end of said period unless during said period all material breaches
     specified have been remedied or waived.

13.4 Either party shall also have the right to terminate this Agreement
     with immediate effect by giving written notice of termination to the other
     party at any time upon or after the occurrence of any of the following
     events with respect to such other party:

     13.4.1  Insolvency, bankruptcy, reorganization or liquidation or filing of
             any application therefor, or other commitment of an affirmative act
             of insolvency, which is not promptly removed or stayed;

     13.4.2  Attachment, execution or seizure of substantially all of the assets
             or filing of any application therefor which is not promptly
             released or stayed;

     13.4.3  Assignment or transfer of that portion of the business to which
             this Agreement pertains to a trustee for the benefit of creditors;

     13.4.4  Termination of its business or dissolution.

13.5 In the event either party shall be acquired or controlled, directly or
     indirectly, by, or shall be consolidated or merged into, any other company
     or corporation and reasonable 

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     assurance satisfactory to the other party shall not be forthcoming in
     connection therewith as to the continued performance by the party's
     successor of its obligations under this Agreement or in the event of such
     other company or corporation being a direct and significant competitor of
     the other party, then the other party shall notify the party's successor
     immediately of such a determination in writing and will have the right for
     a period of ninety (90) days to request negotiations to cure any concerns
     and if no cure is obtained, to request to negotiate the orderly termination
     of this Agreement by giving written notice to the party's successor.

13.6 No failure or delay on the part of either party in exercising its
     right of termination hereunder for any one or more causes shall be
     construed to prejudice its rights of termination for such cause or any
     other or subsequent cause.

13.7 In the event of expiration or termination of this Agreement, within
     sixty (60) days after expiration or termination of this Agreement, the
     receiving party shall return to the disclosing party all media and
     documentation containing the CONFIDENTIAL INFORMATION and render unusable
     all said CONFIDENTIAL INFORMATION placed in any storage apparatus under the
     receiving party's control in accordance with the instruction of the
     disclosing party.

13.8 The termination or expiration of this Agreement shall not release
     either party from any liability which at said date of termination or
     expiration has already accrued to the other party. OKI waives any right to
     damages for termination or expiration of this Agreement in accordance with
     its terms except for affected WIP and WAFER inventory.

13.9 Notwithstanding any termination or expiration of this Agreement, the
     provisions of Articles 1,11,12, Sections 13.7,13.8,13.9, Articles 14, 15,
     16 shall survive this Agreement.


Article 14.   (Government Regulations)
- ----------     ---------------------- 

14.1  Unless prior approval is obtained from the competent governmental agency,
     each party shall not knowingly export or re-export, directly or indirectly,
     any WAFERS to any country or countries to which export or re-export will
     violate any laws or regulations of either the United States of America or
     Japan.


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14.2 OKI shall obtain, at OKI's expense, any and all governmental licenses,
     permits and approvals and make any necessary filings, registrations and
     notifications in Japan which are required in connection with this Agreement
     and shall provide PI with translated copies of any such documents.



Article 15.  (Non-Disclosure)
- ----------    -------------- 

15.1 PI and OKI shall keep the terms and existence of this Agreement
     confidential and shall not make disclosure thereof to any third party
     except:

     15.1.1  with the prior written consent of the other party, such consent
             will not be unreasonably withheld,

     15.1.2  as required by any governmental body having jurisdiction,

     15.1.3  as otherwise required by law or regulations of a stock exchange at
             which the shares of OKI or PI are listed, or

     15.1.4  to legal counsel or accountants of the parties.

15.2 Neither of the parties shall unilaterally make any announcement of the
     formation and existence of this Agreement without prior written consent of
     the other party.


Article 16.  (Miscellaneous Provisions)
- ----------    ------------------------ 

16.1 Entire Agreement.  This Agreement embodies the entire understanding of the
     ----------------                                                          
     parties as it relates to the subject matter hereof and this Agreement
     supersedes any prior agreements or understandings between the parties with
     respect to such subject matter, including without limitation all of the
     provisions (including license grants) under the LWS.  Any potential or
     existing liabilities and claims regarding the purchase of and payment for
     wafers under the terms of the LWS are declared by OKI and PI to be paid in
     full and without further recourse.

16.2 Article Headings.  The article and section headings herein are for
     ----------------                                                  
     convenience only and shall not affect the construction hereof.

16.3 Waiver.  Should either PI or OKI fail to enforce any provision of this
     ------                                                                
     Agreement or to exercise any right in respect thereto, such failure shall
     not be construed as constituting a waiver or a continuing waiver of its
     rights to enforce such provision or right or any other 


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     provision or right.

16.4 No License.  Nothing contained in this Agreement shall be construed as
     ----------                                                            
     conferring by implication, estoppel or otherwise upon either party
     hereunder any license or other right except as expressly set forth herein.

16.5 English Language.  This Agreement is in the English language only,
     ----------------                                                  
     which language shall be controlling in all respects, and all versions
     hereof in any other language shall be for accommodation only and shall not
     be binding upon the parties.  All communications between OKI and PI to
     effect the terms of this Agreement shall be in the English language only.

16.6 No Agency. The parties to this Agreement are independent contractors.
     ---------                                                             
     There is no relationship of agency, partnership, joint venture, employment
     or franchise between the parties.  Neither party has the authority to bind
     the other or to incur any obligation on its behalf.  OKI shall not have,
     and shall not represent that it has, any power, right or authority to bind
     PI, or to assume or create any obligation or responsibility, express or
     implied, on behalf of PI or in PI's name, except as herein expressly
     permitted.

16.7 Notices.  Any notice required or permitted to be given by either party
     -------                                                               
     under this Agreement shall be deemed to have been given at the time it is
     delivered in writing by person or by telefax (provided that in the case of
     telefax, a copy of the notice will promptly be delivered by overnight
     courier) to the other party at the following respective addresses or such
     new addresses as may from time to time be supplied hereunder.

        To:  OKI Electric Industry Co., Ltd.

             550-1 Higashiasakawa-cho

             Hachioji-shi, Tokyo 193-8550, Japan

             Attention:   Eiki Kudo,

                            General Manager

                            Foundry BU Division

             Fax:  81-426-62-6709

        To:  Power Integrations, Inc.

             477 N. Mathilda Ave.

             Sunnyvale, CA 94086


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             Attention:  President

             Fax: (408) 523-9300

16.8  Invalidity.  If any provision of this Agreement, or the application
      ----------                                                         
      thereof to any situation or circumstance, shall be invalid or
      unenforceable, the remainder of this Agreement or the application of such
      provision to situations or circumstances other than those as to which it
      is invalid or unenforceable, shall not be affected; and each remaining
      provision of this Agreement shall be valid and enforceable to the fullest
      extent permitted by applicable law. In the event of such partial
      invalidity, the parties shall seek in good faith to agree on replacing any
      such legally invalid provisions with provisions which, in effect, will,
      from an economic viewpoint, most nearly and fairly approach the effect of
      the invalid provision.

16.9  Assignment.  This Agreement and any rights or licenses granted herein
      ----------                                                           
      shall be binding upon and inure to the benefit of the parties hereto and
      their respective successors and assigns. Neither party shall assign any of
      its rights or privileges hereunder without the prior written consent of
      the other party except as set forth in Section 13.5. Such consent shall
      not be unreasonably withheld.

16.10 Amendment.  This Agreement may not be extended, supplemented or
      ---------                                                      
      amended in any manner except by an instrument in writing expressly
      referring to this Agreement and duly executed by authorized officers of
      both Parties.

16.11 Force Majeure.  Either party shall be excused for failures and delays
      -------------                                                        
      in performance caused by war, declared or not, any laws, proclamations,
      ordinances or regulations of the government of any country or of any
      political subdivision of any country, or strikes, lockouts, floods, fires,
      explosions or such catastrophes as are beyond the control or without the
      material fault of such party ("Causes"). Any party claiming any such
      excuse for failure or delay in performance due to such Causes shall give
      prompt notice thereof to the other party, and neither party shall be
      required to perform hereunder during the period of such excused failure or
      delay in performance except as otherwise provided herein. This provision
      shall not, however, release such party from using its best efforts to
      avoid or remove all such Causes and such party shall continue performance
      hereunder with the utmost dispatch whenever such Causes are removed. In
      the event that the period of

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       excused performance continues for ninety (90) days, this Agreement may be
       terminated by the affected party with written notice to the other party
       without liability.

16.12  Indemnity.  Both parties agree that neither party shall assume any
       ---------                                                         
       responsibility or be liable for death or any injury or accident which may
       occur to any personnel of the other party or the property of such
       personnel during any visits to its facility, or otherwise. Each party
       agrees to indemnify the other party and to hold such other party harmless
       from and against all liabilities, claims and demands on account of
       personal injuries (including death), or loss or damage to property,
       arising out of or in any manner connected with the visits of its
       personnel to such other party's offices or facilities and occasioned by
       the negligence of such personnel, and it shall defend at its own expense
       any and all actions based thereon and shall pay all reasonable charges of
       attorneys and all costs and other expenses arising therefrom.

16.13  Arbitration.  All disputes and differences between OKI and PI arising out
       -----------                                                              
       of or under this Agreement or the LWS Agreement shall be settled amicably
       through negotiations. In case such dispute or difference cannot be
       settled amicably through negotiations in a reasonable period of time, it
       shall be finally settled by arbitration in San Francisco, California if
       initiated by OKI and in Tokyo, Japan if initiated by PI pursuant to the
       Japan-American Arbitration Agreement of September 16, 1952, by which each
       party is bound. The award rendered by arbitrator(s) shall be final and
       binding upon the parties hereto. The arbitrator's award shall be fully
       enforceable in any court having jurisdiction of the parties and OKI
       irrevocably consents to the non-exclusive jurisdiction of the California
       courts for matters related to injunctive relief or the enforcement of
       such award. Notwithstanding the foregoing, if the dispute involves the
       protection of the CONFIDENTIAL INFORMATION or INTELLECTUAL PROPERTY
       RIGHTS then either party make seek injunctive relief immediately from the
       courts.

16.14  Limitation of Liability. EXCEPT AS TO OBLIGATIONS ARISING UNDER
       -----------------------                                        
       SECTIONS 11.2 AND 11.4, NEITHER PARTY SHALL BE LIABLE TO THE OTHER PARTY
       OR ANY THIRD PARTY FOR ANY INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES,
       LOSS OF PROFITS OR REVENUE, LOST OPPORTUNITY, OR INTERRUPTION OF BUSINESS
       IN ANY WAY ARISING OUT 

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       OF OR RELATED TO THIS AGREEMENT, REGARDLESS OF THE FORM OF ACTION,
       WHETHER IN CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT PRODUCT
       LIABILITY OR OTHERWISE, EVEN IF ANY REPRESENTATIVE OF THE PARTY HAS BEEN
       ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

16.15  Governing Law.  This Agreement and matters connected with the
       -------------                                                
       performance hereof shall be construed, interpreted, applied and governed
       in all respects in accordance with the laws of California and the United
       States without regard to conflict of laws principles.

16.16  OKI and PI shall each enter into separate written agreements with each of
       their subsidiaries who wish to exercise any rights under this Agreement,
       binding the subsidiary to the terms and conditions of this Agreement. OKI
       and PI each guarantee to the other the performance of their respective
       subsidiaries under this Agreement, and each will indemnify and hold
       harmless the other from any costs, damages, or liabilities incurred by
       the other arising out of a breach by a subsidiary of the terms and
       conditions of this Agreement.



  IN WITNESS WHEREOF, the parties have caused this Agreement to be executed in
their respective corporate names by their duly authorized representatives on the
date written below.




OKI Electric Industry Co., Ltd.           Power Integrations, Inc.
 
Signature: /s/ Yasuahi Ozawa              Signature: /s/ H.F. Earhart      
          -------------------------                  -------------------------
Name:  Yasuahi Ozawa                      Name:  H.F. Earhart      
      -----------------------------             ------------------------------
Title:  Dir. & Gen. Mgr. Lsi Div.         Title:  Pres. & CEO   
       ----------------------------              ----------------------------- 
Date:  Sep. 29, 1998                      Date:  September 30, 1998
      -----------------------------             ------------------------------
                                          



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                                   EXHIBIT A

                  OKI FOUNDRY CAPACITY and PI ANNUAL FORECAST
                  -------------------------------------------



1.  OKI FOUNDRY CAPACITY:



        4 inch wafer (M1 Fabrication.)   5 inch wafer (M2 Fabrication.)
        -------------------------------  ------------------------------



  From July 1, 1998     * wafers per month      * wafers / month
  up to March 31, 1999



2.  PI's projected PI ANNUAL FORECAST of  WAFER orders (non-binding).



<TABLE>
<CAPTION>                                                                              
- --------------------------------------------------------------------------------------- 
<S>                      <C>             <C>             <C>             <C> 
OKI Fiscal Year              1999                  2000            2001            2002
- ---------------------------------------------------------------------------------------
      4" Wafers              *                     *               *               *
- ---------------------------------------------------------------------------------------
</TABLE>

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                                   EXHIBIT B

                                  WAFERS PRICE
                                  ------------


Production WAFERS (4") BASE_PRICE = *

F/X_BASE = *

Initial F/X_RATE = *

A new F/X_RATE is only established at the time of placing a purchase order for
WAFERSs if the Previous Month's Average daily exchange rate is equal to or
greater than * from the current F/X_RATE.  The new F/X_RATE will be set to the
Previous Month's Average exchange rate and will remain in effect for at least
the month it was established.

The actual WAFERS PURCHASE_PRICE used at the time of order will be calculated by
the following formula:



          PURCHASE_PRICE =   *



     Examples:



       1)  Nominal F/X Rate Example: F/X_RATE = *:

           PURCHASE_PRICE = *


       2)  Higher F/X Rate Example: New F/X_RATE = *:

           PURCHASE_PRICE = *


       3)  Lower F/X Rate Example: New F/X_RATE = *:

           PURCHASE_PRICE = *



Additionally, a F/X_ADDITIONAL_CHARGE of * will be paid to OKI for each of the
WAFERS accepted by PI during the first year of the Agreement.

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                                   EXHIBIT C
                                        


                             COMMON SPECIFICATION
                             --------------------
 

The initial COMMON SPECIFICATION is the * to produce and deliver WAFERS to PI
under the LWS AGREEMENT on the effective date of this agreement.


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<PAGE>
 
                                                                 EXHIBIT 10.22
 
                       MASTER EQUIPMENT LEASE AGREEMENT


          THIS AGREEMENT is entered into the 31st day of July, 1998 between
METLIFE CAPITAL, LIMITED PARTNERSHIP ("Lessor") whose address is 10900 N.E. 4th
St., Suite 500, mailing address C-97550, Bellevue, Washington 98009 and POWER
INTEGRATIONS, INC. ("Lessee") whose address is 477 NORTH MATHILDA AVENUE,
SUNNYVALE, CA 94086

          1. LEASE OF EQUIPMENT

          This Master Equipment Lease Agreement ("Agreement") contains general
terms and conditions applying to each Equipment Lease ("Lease") between Lessor
and Lessee that incorporates this Agreement by reference.  The equipment or
other personal property covered by all Leases, together with all components,
parts, additions, accessions, attachments, substitutions therefor and
replacements thereof is collectively called the "Equipment" and individually
called an "Item."  Each Lease will contain terms and conditions applying only to
the Equipment covered by that Lease and will constitute a separate lease of that
Equipment.

          To accept an Item under a Lease, Lessee will sign and deliver to
Lessor a Certificate of Acceptance for the Item in a form provided by Lessor.
When Lessor has confirmed that all of its requirements and conditions have been
met, it will promptly pay the Total Cost of the Item specified in the
Certificate of Acceptance, as directed by Lessee.  Lessor requirements and
conditions shall include, but not be limited to, receipt from Lessee of such
instruments, documents, and certifications as Lessor reasonably may request,
including without limitation evidences of authority (such as corporate
certificates, corporate resolutions, and partnership authorizations), evidence
of insurance, purchase orders and acceptances thereof, purchase and sale
agreements, guarantees or other credit enhancements, if any, required by Lessor
and financial information and instruments and documents to implement, perfect or
continue the perfection of Lessor's rights and remedies as owner and Lessor of
the Equipment, including Uniform Commercial Code forms.  Notwithstanding the
execution, delivery or filing of any instruments or documents, it is agreed that
this transaction is a lease and is not intended as security.

          Following the date ("Closing Date") which is the earlier of: (i) the
date Lessee gives Lessor a Certificate of Acceptance for the last Item; (ii) the
Purchase Cut-Off Date; or (iii) on such other day as is mutually agreed, Lessor
shall send Lessee a Closing Schedule, setting forth any adjustments to payment
schedules, stipulated loss values or other matters.  Such Closing Schedule and
the facts and determinations set forth therein shall upon execution by Lessee
and Lessor be conclusive as to the matters therein.  Alternatively, in lieu of
signing the Closing Schedule, Lessee may, within thirty (30) days after the
Closing Schedule is sent by Lessor to Lessee, give Lessor written notice
identifying any claimed error therein.  Notwithstanding any such notice, Lessee
shall pay all rentals as they become due.  If Lessee establishes an error that
affects the amount of rentals, Lessor shall give Lessee a credit for any
overpayment of rentals, and Lessee promptly shall pay to Lessor on demand any
underpayments.  If Lessee neither signs the Closing Schedule nor gives written
notice of claimed errors, the Closing Schedule shall be conclusively deemed to
be accurate thirty (30) days after the Closing Schedule is sent by Lessor to
Lessee.

          Lessee authorizes Lessor to insert in the Lease or the Closing
Schedule, dates, models, serial numbers, and other pertinent data relative to
the proper identification of Equipment and/or the Lessee.

          If by the "Purchase Cut-Off Date" set forth in a Lease, Lessee shall
not have given Lessor written notice of acceptance of an Item, Lessor shall have
no obligation to purchase the Item or to lease it to Lessee.  In such event
Lessee shall immediately pay all accrued Interim Rental and reimburse Lessor for
all sums Lessor may have paid for or with respect to the Item and for all
Lessor's costs and expenses with respect thereto, and Lessee shall indemnify and
defend Lessor against and hold Lessor harmless from any and all cost, expense,
loss, liability and damage that Lessor may suffer or may be asserted against
Lessor by reason of Lessor's failure or refusal to purchase such Item.  Any such
item shall be deemed to be deleted from the Lease and no longer included as an
Item of Equipment.

          2. NON-CANCELLABLE NET LEASE

          EACH LEASE IS A NON-CANCELLABLE NET LEASE.  WHEN LESSEE SIGNS AND
DELIVERS A CERTIFICATE OF ACCEPTANCE FOR ANY ITEM, ITS OBLIGATION TO PAY ALL
RENT AND OTHER AMOUNTS WHEN DUE FOR THE ITEM AND OTHERWISE TO PERFORM AS
REQUIRED UNDER THE RELATED LEASE IS UNCONDITIONAL, IRREVOCABLE AND INDEPENDENT.
THESE OBLIGATIONS ARE NOT SUBJECT TO CANCELLATION, TERMINATION, MODIFICATION,
REPUDIATION, EXCUSE OR SUBSTITUTION BY LESSEE.  LESSEE IS NOT ENTITLED TO ANY
ABATEMENT, REDUCTION, OFFSET, DEFENSE OR COUNTERCLAIM WITH RESPECT TO THESE
OBLIGATIONS FOR ANY REASON, WHATSOEVER, WHETHER ARISING OUT OF DEFAULT OR OTHER
CLAIMS AGAINST LESSOR OR THE MANUFACTURER OR SUPPLIER OF THE ITEM, DEFECTS IN OR
DAMAGE TO THE ITEM, ITS LOSS OR DESTRUCTION, OR OTHERWISE.  EACH LEASE IS
INTENDED TO CONSTITUTE A TRUE LEASE AND NOT A SALE OF THE RELATED EQUIPMENT.
TITLE TO THE EQUIPMENT WILL REMAIN WITH LESSOR AT ALL TIMES.  LESSEE'S INTEREST
IN THE EQUIPMENT IS LIMITED TO A LEASEHOLD.

          3. LESSEE'S WARRANTIES AND COVENANTS

          Lessee represents and warrants to Lessor upon execution of this
Agreement and each Lease, that: (i) unless Lessee is a sole proprietorship it is
a corporation, limited liability company or partnership duly organized, validly
existing and in good standing under the laws of the jurisdiction of its
organization and that it is qualified to do business in every jurisdiction where
the failure to qualify would have a material adverse effect on Lessor's rights
hereunder; (ii) it has taken all corporate, company or partnership action which
may be required to authorize the execution, delivery and performance of this
Agreement and each Lease; (iii) such execution, delivery and performance will
not conflict with or violate any provision of its Charter or Articles or
Certificate of Incorporation, By-laws, operating agreement or similar governing
document, or any provisions thereof, or in the case of a partnership, its
Certificate of Partnership or Limited Partnership and its Partnership Agreement,
or in the case of a limited liability 

                                  Page 1 of 8
<PAGE>
 
company, its Articles of Organization, or result in a default or acceleration of
any obligation under any agreement, order, decree or judgment to which it is a
party or by which it is bound; (iv) it is not now in default under any of the
same; (v) there is no litigation or proceeding pending or threatened against it
which if decided adverse to Lessee's interests may have a material adverse
effect on Lessee or which would prevent or hinder the performance by it of its
obligations hereunder; (vi) this Agreement, each Lease and the attendant
documents constitute valid obligations of the Lessee, binding and enforceable
against it in accordance with their respective terms; (vii) no action by or with
any commission or administrative agency is required in connection herewith;
(viii) it has the power to own its assets and to transact business in which it
is engaged; (ix) it will give to Lessor prompt notice of any change in its name,
identity or structure; (x) each Lease will be effective against all creditors of
Lessee under applicable law, including fraudulent conveyance and bulk transfer
laws; (xi) the financial statements and any other information furnished and to
be furnished to Lessor are and will be true and correct at the time of delivery;
(xii) as long as any Lease is in effect, Lessee will promptly furnish Lessor
with annual balance sheets and profit and loss statements of Lessee and any
guarantor of Lessee's obligations accompanied, at Lessor's request, by the audit
reports of an independent certified public accountant acceptable to Lessor and
such other information as Lessor may reasonably request at any time concerning
Lessee and its affairs; (xiii) each Item shall be personal property and in good
order and condition and, unless Lessor otherwise agrees in writing, has not been
used prior to the time of Lessee's execution of the Certificate of Acceptance
pertaining thereto; (xiv) at all times Lessee shall keep the Equipment in
Lessee's possession at the address specified in the Lease unless Lessor shall
otherwise consent in writing (the only requirement with respect to rolling stock
is that it remain within the continental United States); (xv) Lessee shall not
cause, suffer or permit any Item to be attached or affixed to real property or
improvements thereon (collectively, "Realty") unless Lessor first shall consent
thereto in writing and Lessee shall have obtained from all persons having any
interest in the Realty written consents in form satisfactory to Lessor which
approve such attachment, waive any claims to or encumbrances upon attached Items
and consent to the detachment and removal of such Items at any time by Lessor or
Lessee; and (xvi) notwithstanding attachment of any Items to Realty, all the
Equipment at all times shall be and remain personal property.

          4. TERM OF LEASE

          The term of each Lease ("Term") shall consist of an "Interim Term" and
a "Basic Term."  The Interim Term shall begin on the date that Lessee first
gives Lessor written notice of acceptance of an Item or written approval for
partial payment, whichever is earlier, and shall continue until the time the
Basic Term begins.  The Basic Term shall begin on the Closing Date and shall
continue for the length of the Basic Term set forth in the respective Lease.

          5.  INTERIM RENTAL

          During the Interim Term, Lessee shall pay rent monthly ("Interim
Rental"), on a calendar month basis, in an amount determined by Lessor by
applying the "Interim Rental Rate" set forth in the Lease to portions of the
Total Cost then or theretofore expended by Lessor, for the number of days such
sums are outstanding during such calendar month.  Lessee shall pay Lessor each
installment of Interim Rental on the fifteenth day after the end of such
calendar month.

          6.  PERIODIC RENTAL

          Lessee shall pay rent ("Periodic Rental") for the Basic Term in an
amount calculated by multiplying the Total Cost by the Periodic Rental Rate set
forth in the Lease multiplied by the number of periods constituting the length
of the Basic Term.  Lessee shall pay installments of Periodic Rental to Lessor
in accordance with the payment schedule set forth in the Lease.

          7.  LATE PAYMENT

          If any installment of rent or other sum owing under the Lease shall
not be paid when due and shall remain unpaid for ten (10) days, Lessee shall pay
Lessor a late charge equal to five percent (5%) of the amount delinquent, but in
no event at a rate greater than limited by any applicable law.  Such late charge
is in addition to and not in lieu of other rights and remedies Lessor may have.

          8. NO LESSOR EQUIPMENT WARRANTIES

          LESSOR LEASES THE EQUIPMENT AS-IS AND EXPRESSLY DISCLAIMS AND MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, AS TO THE CONDITION, DESIGN, QUALITY, CAPACITY,
MERCHANTIBILITY OR FITNESS FOR A PARTICULAR PURPOSE OF, OR ANY OTHER MATTER,
CONCERNING THE EQUIPMENT.  LESSEE HEREBY WAIVES ANY CLAIM (INCLUDING ANY CLAIM
BASED ON STRICT OR ABSOLUTE LIABILITY IN TORT) IT MAY HAVE AGAINST LESSOR FOR
ANY LOSS, DAMAGE (INCLUDING INCIDENTAL OR CONSEQUENTIAL DAMAGE) OR EXPENSE
CAUSED BY OR RELATING TO THE EQUIPMENT.  LESSEE HAS SELECTED OR WILL SELECT BOTH
THE EQUIPMENT OF THE TYPE AND QUANTITY WHICH IS THE SUBJECT HEREOF AND THE
SUPPLIER FROM WHOM LESSOR PURCHASED THE EQUIPMENT.

          9.  INSURANCE

          Lessee shall at all times prior to return of an Item to Lessor procure
and continuously carry, maintain and pay for: (A) physical damage insurance
providing "all risks" coverage for the Item in an amount not less than the full
replacement value thereof and (B) bodily injury and property damage combined
single limit liability insurance, all in such amounts and against such risks and
hazards and with insurance companies and pursuant to contract or policies and
with exclusions and deductibles thereon satisfactory to Lessor.  All contracts
and policies: (i) shall include provisions for the protection of Lessor
notwithstanding any act or neglect of or breach or default by Lessee; (ii) shall
provide that they may not be modified, terminated or canceled unless Lessor is
given at least thirty (30) days advance written notice thereof; (iii) shall
contain endorsements (x) naming Lessor (and if Lessor requests at any time, any
successor, assignee, or secured party of Lessor) as loss payee for physical
damage insurance and as additional insured for liability insurance, (y)
providing that such insurance is primary as to the Item without right of
contribution from any other insurance, (z) providing thirty (30) days prior
written notice to Lessor (and any successor, assignee, or secured party) before
coverage lapses or is cancelled or materially changed, or before there is a
change in insurer.  Lessee shall promptly notify 

                                  Page 2 of 8
<PAGE>
 
any appropriate insurer and Lessor of each and every occurrence which may
become the basis of a claim or cause of action against the insureds and
provide Lessor with all data pertinent to such occurrence. Lessee will send
Lessor a certificate evidencing such insurance and endorsements or copies of
the policies upon request before the Item's Acceptance Date and whenever the
insurance is renewed. As long as no Event of Default exists, Lessor will remit
any physical damage insurance proceeds for an Item to Lessee when Lessee
either (A) provides evidence that the Item has been repaired and restored to
the good operating order and condition required under Section 11, or (B) pays
Lessor the amount due upon an Event of Loss as provided in Section 13.

          10.  LESSEE TAX INDEMNITIES

          (a) GENERAL.  Lessee will pay and defend, indemnify and hold harmless
Lessor and any successor, assignee or secured party of Lessor on an after-tax
basis from any and all Taxes (as defined below) on or relating to: (i) the
Equipment; (ii) its ordering, purchase by Lessor, acceptance, delivery,
installation, ownership, leasing, possession, maintenance, documentation, use,
operation, transportation, return or other disposition; (iii) its rentals,
receipts or earnings; and (iv) any Lease.  "Taxes" means taxes, fees, or other
governmental charges that are not based on the net income of the indemnified
party, whether they are assessed to or payable by Lessee or an indemnified
party, and includes without limitation: (A) franchise, business and occupation,
gross receipts, sales, use, licensing, registration, titling, stamp and personal
property taxes; (B) levies, imposts, duties, charges and withholdings; and (C)
penalties, fines, and additions to tax and interest.  Lessee shall not be
obligated to pay any amount under this section so long as it shall in good faith
and by appropriate proceedings contest the validity or the amount thereof,
unless such contest would adversely affect the title of Lessor to any Item of
Equipment or would subject any Item to forfeiture or sale.  Lessee shall
indemnify and hold harmless Lessor, on an after-tax basis, against any and all
loss, claims, demands and expenses, including legal expenses, resulting from any
such non-payment or contest.

          Unless Lessor elects otherwise, Lessor will prepare and file all
reports and returns relating to Taxes covered by this Section and will pay all
such Taxes to the appropriate taxing authority.  Lessee will reimburse Lessor
for all such payments promptly on request.  However, if Lessor elects, upon
written notice to Lessee, Lessee will prepare and file all such reports and
returns, pay all such Taxes directly to the taxing authority and deliver to
Lessor reasonable evidence thereof.

          Upon termination of this Lease as to any Item, Lessee will, on
request, advance to Lessor the amount estimated by Lessor to equal personal
property taxes on the Item which are not yet payable but for which Lessee will
afterward become liable hereunder.  Lessor will account to Lessee for such
advances.
          (b) FEDERAL TAX INDEMNITIES.  If Lessor shall lose the right to claim,
suffer a disallowance of or be required to recapture all or any portion of the
accelerated cost recovery deductions pursuant to Internal Revenue Code Section
168 with respect to the Total Cost for property with recovery period(s) referred
to in the Lease; then, unless such result is due to Lessor's act or omission
(other than its exercise of remedies after default) or to a loss for which
Lessee pays the Stipulated Loss Value of the affected Equipment, Lessee shall
pay to Lessor on demand a sum equal to the amount of deductions or credits lost
by Lessor as a result of such event, plus the amount of any interest, penalties
and additions to tax payable by Lessor as a result of such event.  The amount of
lost deductions and credits to be paid by Lessee pursuant to this Section shall
be computed by Lessor so as to cause Lessor's after-tax rate of return on
investment and after-tax cash flows in respect of the Lease to equal that which
would have been realized by Lessor if such event had not occurred, but without
regard to whether Lessor has or would have had taxable income sufficient to use
the lost deductions or credits.  Lessee shall indemnify and hold harmless Lessor
from and against any and all taxes, assessments and other charges imposed upon
Lessor under the laws of any federal, state, local or foreign government or
taxing authority, as a result of any payment made by Lessee pursuant to this
Section 10.

          11. MAINTENANCE AND ALTERATIONS

          (a) Lessee at its expense at all times shall maintain, service and
repair any damage to the Equipment so as to: (i) keep the Equipment in good and
efficient working order, condition and repair, ordinary wear and tear resulting
from proper use excepted, and make all inspections and repairs, including
replacement of worn parts (which replacement parts shall be free and clear of
all liens and encumbrances and shall, upon incorporation into the Item, become
the property of Lessor free and clear of any and all liens and encumbrances and
subject to the related Lease), to effect the foregoing and to comply with
requirements of laws, regulations, rules and provisions and conditions of
insurance policies; and (ii) pay all costs, expenses, fees and charges incurred
in connection with the use or operation of the Equipment and of each Item,
including but not limited to repairs, maintenance, storage and servicing.
Lessee will maintain in effect a warranty by or maintenance contract with the
manufacturer or other recognized maintenance provider of the Equipment, and will
send Lessor a copy of such warranty or contract on request.  If Lessee has the
Equipment maintained by someone other than the manufacturer, Lessee will pay any
costs necessary to have the manufacturer re-certify the Equipment for continued
maintenance at the expiration of its Lease Term or any Renewal Term.  Lessee
shall not make any alterations, substitutions, improvements or additions to the
Equipment or Items, except those required in order to comply with laws,
regulations, rules and insurance policies, unless Lessor first shall have
consented thereto in writing.  Notwithstanding any consent by Lessor, Lessee
shall pay all costs and expenses of the foregoing.  All replacements, repairs,
improvements, alterations, substitutions and additions shall constitute
accessions to the Equipment and title thereto shall vest in Lessor, and shall be
free of any and all liens.  In performing its obligations under this Section,
Lessee will not treat the Equipment less favorably than similar equipment that
it owns or leases, or reduce its performance in contemplation of expiration of
the Term or any Renewal Term.

          (b) Lessor hereby transfers and assigns to Lessee, for so long during
the Term and any Renewal Term as Lessee is not in default, Lessor's right,
title and interest in, under and to any assignable factory and dealer
warranty, whether express or implied, with respect to the Equipment. All
claims and actions upon any warranty shall be made and prosecuted by Lessee at
its sole cost and expense. Lessor shall have no obligation to make or
prosecute any claim upon or under a warranty.

                                 Page 3 of 8
<PAGE>
 
          12.  USE; QUIET ENJOYMENT

          So long as Lessee shall not be in default, Lessee shall be entitled to
the possession, use and quiet enjoyment of the Equipment during the Term and any
Renewal Term in accordance with the terms of the Lease.  Unless a purchase
option is exercised, Lessee shall deliver and surrender the Equipment to Lessor
at the end of the Term or Renewal Term in accordance with Section 16 hereof.
Lessee warrants that the Equipment will at all times be used and operated solely
in the conduct of Lessee's business in a careful and proper manner for the
purpose for which it was designed and intended and under and in compliance with
manufacturer's specifications and applicable laws and all lawful acts, rules,
regulations and orders of any governmental bodies or officers having power to
regulate or supervise the use of such property, except that Lessee may in good
faith and by appropriate proceedings contest the application of any such rule,
regulation or order in any reasonable manner that will not adversely affect the
title of Lessor to any Equipment or subject the same to forfeiture or sale.
Lessee will not permit its rights or interest hereunder to be subject to any
lien, charge or encumbrance and will keep the Equipment free and clear of any
and all liens, charges, encumbrances and adverse claims (except those arising
from acts of Lessor).  Lessor may inspect the Equipment and its maintenance
records on reasonable notice and subject to Lessee's security procedures.   All
such inspection rights are for the sole benefit of Lessor and shall not be
construed to impose any obligation on Lessor, whether or not Lessor makes any
inspections or receives any reports.

          13. EVENT OF LOSS

          Each Lease is a net lease.  Lessee assumes all risk of and shall
indemnify and hold harmless Lessor from and against all damage to and loss of
the Equipment from any cause whatsoever, whether or not such loss or damage is
or could have been covered by insurance (an "Event of Loss").  Except as
otherwise specifically provided herein, neither this Agreement nor related Lease
shall terminate and there shall be no abatement, reduction, suspension or
deferment of Interim or Periodic Rental for any reason, including damage to or
loss of the Equipment or any one or more Items.  Lessee promptly shall give
Lessor written notice of any material loss or damage, describing completely and
in detail the cause and the extent of loss and damage.  Upon the occurrence of
an Event of Loss, at its option Lessee shall: (i) repair or restore the damaged
or lost Items to good condition and working order; or (ii) replace the damaged
or lost Items with similar equipment of equal value in good condition and
working order; or (iii) pay Lessor in cash the Stipulated Loss Value, as defined
below of the damaged or lost Items.  Upon Lessee's complying with the foregoing,
Lessor shall pay or cause to be paid over to Lessee the net proceeds of
insurance, if any, with respect to such damage or loss.  "Damage" and "loss"
shall include damages and losses of any kind whatsoever including, without
limitation, physical damage and partial or complete destruction, including
intentionally caused damage and destruction, and theft.  Upon payment by Lessee
of the Stipulated Loss Value for an Item, along with any rent, late charges,
taxes, or other amounts then due and owing, Lessor will then deliver a Bill of
Sale for the Item, and Lessee's obligation to pay rent for the Item will
terminate.

          The Stipulated Loss Value of an Item as of any date shall equal a sum
computed by Lessor, which shall not exceed the amount determined by multiplying
the Total Cost of the Item by the Stipulated Loss Factor as set forth in the
applicable Closing Schedule for the Lease year during which the loss of the Item
occurs.

          14. OWNERSHIP AND MARKING

          Lessee has not and by execution and performance hereof will not have
or obtain any title to the Equipment or any other interest therein except as
Lessee hereunder and subject to all the terms hereof.  Title to the Equipment
shall at all times remain in Lessor and Lessee at its expense shall protect and
defend the title of Lessor and keep it free of all claims and liens other than
the rights of Lessee hereunder and claims and liens created by or arising
through Lessor.  Lessee will treat this transaction as a lease for tax purposes
and will not claim any credit or deduction inconsistent with Lessor's ownership
of the Equipment.  If Lessor supplies Lessee with labels designating its
interest in the Equipment, Lessee shall affix the same to and keep them in a
prominent place on the Equipment.

          Notwithstanding the express intent of the parties, should a court of
competent jurisdiction determine that this Agreement is not a true lease, but
rather one intended as security, then solely in that event and for the expressly
limited purposes hereof, Lessee shall be deemed to have hereby granted Lessor a
security interest in this Lease, the Equipment, and all accessions thereto,
substitutions and replacements therefor, and proceeds (including insurance
proceeds) thereof, to secure the prompt payment and performance as and when due
of all obligations and indebtedness of Lessee to Lessor, now existing, or
hereafter created; provided however, that the foregoing shall not apply if such
determination is made solely for purposes of federal tax laws and regulations.

          15. LESSEE'S GENERAL INDEMNITIES

          Lessee will pay and defend, indemnify and hold harmless Lessor and any
successor, assignee or secured party of Lessor, on an after-tax basis from and
against any claim, cause of action, damage, liability, cost or expense
(including but not limited to legal fees and costs) which may be asserted
against or incurred in any manner by or for the account of Lessor: (i) relating
to the Equipment or any part thereof, including without limitation the
manufacture, construction, purchase, delivery, acceptance or rejection,
installation, ownership, sale, leasing, removal or return of the Equipment, or
as a result of the use, maintenance, repair, replacement, operation or the
condition thereof (whether defects are latent or discoverable); (ii) by reason
or as a result of any act or omission of Lessee for itself or as agent or
attorney-in-fact for Lessor hereunder; (iii) as a result of claims for patent,
trademark or copyright infringement; (iv) as a result of product liability
claims or claims for strict liability; or (v) resulting from claims for personal
injury, death or property damage.

          16. LESSEE OPTIONS AT EXPIRATION OF LEASE TERM

          (a)  At least One Hundred Twenty (120) days before the expiration of
the Term of the first Item accepted under each Lease, Lessee will give Lessor
written notice electing one of the following options with respect to all (but
not less than all) Items covered by the Lease, to be performed with respect to
each Item at the expiration of its Term:  (i) renew the Lease as to all such
Items at their Fair Market Rental Value (as defined below) subject to the
provisions of the next paragraph;

                                  Page 4 of 8
<PAGE>
 
(ii) purchase all such Items for their Fair Market Value (as defined below) on
the last day of the Term; or (iii) return all such Items to Lessor in accordance
with (b) below.

          If Lessee purchases an Item, it will also pay all sales, use and
similar taxes imposed in connection with the purchase.  When Lessor receives the
Item's purchase price and any such taxes, and all other amounts due under the
Lease it will deliver to Lessee a Bill of Sale for the Item "AS IS - WHERE IS"
without recourse to or representation or warranty by Lessor except for a
warranty that the Item is free and clear of liens, claims and encumbrances
created by contract by Lessor or arising out of claims against Lessor unrelated
to its ownership or leasing of the Equipment.

          Lessee's renewal option is for a single renewal term (the "Renewal
Term") of one year unless otherwise agreed by Lessor and Lessee in writing, but
is not available if an Event of Default, or an event which would become an Event
of Default with passage of time or giving of notice or both, exists or if there
has been a material adverse change in Lessor's sole discretion since the date of
the Lease in the financial condition of Lessee or any guarantor of Lessee's
obligations under the Lease.  The terms and conditions under the Lease shall
continue to apply to the Items during any Renewal Term except that rent payable
for each Item shall be its then Fair Market Rental Value.  At least one hundred
twenty (120) days before the expiration of any Renewal Term, Lessee will give
Lessor written notice electing one of the following options with respect to all
(but not less than all) Items covered by the renewal, to be performed with
respect to each Item at the expiration of its renewal term:  (i) purchase all
such Items for their then Fair Market Value; or (ii) return all such Items to
Lessor.

          Each notice delivered by Lessee required above will constitute
Lessee's irrevocable agreement to perform the action elected in the notice.

          (b)  At the expiration of the Term or Renewal Term of each Item that
Lessee does not purchase, Lessee will at its sole expense and risk de-install,
pack, and crate such Items and return them to Lessor (all in accordance with
industry standards and the manufacturer's recommendations and maintenance
certification standards) at any location in the continental United States
designated by Lessor in the good operating order and condition required under
Section 11, free of all liens, claims and encumbrances as provided in Section
14, together with all related plans, specifications, operating manuals,
maintenance records and similar documents.  If for any reason Lessee fails to
return any Item as required in the condition required, Lessee's obligations
under the related Lease shall continue in full force and effect on a month to
month basis as to the Item and Lessee will continue to pay the current rent for
the Item.

          (c)  The "Fair Market Value" and "Fair Market Rental Value" of any
Item shall be the amount that would be paid for an Item in an arm's length
transaction between an informed and willing buyer or lessee (other than a used
equipment dealer) to an informed and willing seller or lessor, neither under any
compulsion to buy, sell or lease.  Costs of removal from the location of use
shall not be deducted from such value.  If Lessee has not maintained the Item to
the standards required by this Agreement, Fair Market Value or Fair Market
Rental Value shall be determined as though the Item had been maintained to those
standards.  If Lessor and Lessee have not agreed on the Fair Market Value or
Fair Market Rental Value of an Item by the sixtieth (60th) day before its Term
or Renewal Term expires, it shall be determined by averaging the determinations
(disregarding the one that differs most from the other two) of three qualified
independent appraisers, one appointed by Lessor, the second by Lessee, and the
third by the first two appraisers or by a court having jurisdiction.   Lessor
and Lessee shall each pay the cost of its appointed appraiser and shall each pay
half of the cost of the third appraiser.

          17. LESSOR MAY PERFORM

          If Lessee at any time shall fail to pay any sum which Lessee is
required by this Agreement to pay or shall fail to do or perform any other act
Lessee is required by this Agreement to do or perform, Lessor at its option may
pay such sum or do or perform such act, and Lessee shall reimburse Lessor on
demand for the amount of such payment and for the cost and expense which may be
incurred by Lessor for such acts or performance, together with interest thereon
at the Default Rate from the date of demand until paid.

          18.  DEFAULT

          (a) EVENTS OF DEFAULT.  Each of the following shall constitute an
event of default ("Event of Default"):  (i) failure to perform and comply with
the provisions and conditions of Section 9 hereof or to pay any sum, including
installments of rental, within ten (10) days of the date when due; (ii) failure
to perform and comply with any other provision or condition of this Agreement
within thirty (30) days after Lessor shall have given Lessee written notice of
default with respect thereto, or failure to make good, within thirty (30) days
after written notice by Lessor to Lessee, any representation or warranty,
whether made in this Agreement or any Lease or in any certificate, agreement,
instrument or statement, including income and financial statements, which shall
prove to have been incorrect in any material respect when made; (iii) any event
of default occurs with respect to any obligations of Lessee to Lessor on or with
respect to any transactions, debts, undertakings or agreements other than this
Agreement; (iv) the failure of Lessee generally to pay its debts as they become
due in the ordinary course of business, or the filing of any application for the
appointment of a receiver for a major part of Lessee's assets or the filing of
any petition or application by or against Lessee under any present or future
laws for the relief of debtors or for the subjection of the property of a debtor
to the control of any court, tribunal or agency for the benefit of creditors,
including proceedings under the Bankruptcy Code, if the proceeding commenced by
such filing, if instituted against Lessee, shall not be dismissed for a period
of sixty (60) days; (v) the execution by Lessee of a general assignment for the
benefit of creditors; (vi) Lessee winds up, dissolves or otherwise terminates
its corporate,  partnership or limited liability company existence, or
consolidates with or merges with or into any entity, or sells, leases or
otherwise transfers substantially all of its assets to any entity, or incurs a
substantial amount of indebtedness other than in the ordinary course of its
business, or engages in a leveraged buy-out or any other form of corporate
reorganization, including conversions to Sub "S" corporation status.

          (b) EFFECT ON LESSOR'S OBLIGATION.  Upon the occurrence of an Event of
Default, Lessor shall have no further obligation to Lessee to purchase Equipment
or Items or to lease any thereof to Lessee.

          (c)       REMEDIES.

          Upon the occurrence of an Event of Default as provided above, Lessor
may at its option:

                                  Page 5 of 8
<PAGE>
 
          (i) proceed by appropriate court action or actions, either at law or
in equity, to enforce performance by the Lessee of the applicable covenants of
this Agreement and applicable Lease or to recover damages for the breach
thereof; or

          (ii) by notice in writing to the Lessee terminate Lessee's right of
possession of the Equipment, whereupon all rights of the Lessee to possess and
use the Equipment shall absolutely cease and terminate, but Lessee shall remain
liable as follows:

          Upon such a termination, Lessee at its expense shall immediately
redeliver the Equipment to Lessor at the location specified in Section 16 (b)
hereof.  If Lessee shall fail to do so, Lessor may retake possession of the
Equipment by entering upon any premises at any reasonable time and thereafter
Lessor may hold, possess, sell, upgrade, lease to others or enjoy the same, free
from any right of Lessee, or its successors or assigns.  If Lessor so retakes
possession, Lessee upon demand shall reimburse Lessor for all costs and expenses
relating thereto.  Notwithstanding such redelivery or retaking Lessor shall have
a right to recover from Lessee any and all amounts which under the terms of this
Agreement may be then due or which may have accrued to the date of such
termination, and also to recover forthwith from the Lessee its damages for loss
of a bargain and not as a penalty, an amount equal to the higher of Fair Market
Value or the Stipulated Loss Value of the Equipment as of the rent payment date
on or next preceding the date of default, less:

             (A) the amount Lessor in fact receives from the sale of the
Equipment, after deduction of all estimated expenses of such sale (Equipment
which Lessor is unable to recover shall at Lessor's option be deemed
worthless); or

             (B) at Lessor's election, the present value of the non-
cancellable regularly scheduled rentals receivable from a subsequent lease of
all or part of the Equipment entered into by Lessor (discounted at the Default
Rate), and taking into account only the rentals receivable from the
commencement date of such subsequent lease until the end of the Term for such
Equipment.

          In addition to all amounts and damages to which Lessor is entitled as
set forth above, Lessee shall be liable to Lessor for all costs and expenses
incurred by Lessor by reason of Lessee's breach or default.  Lessee shall also
be liable for interest on any of the above referenced amounts from and after the
due date at the Default Rate, or the legal limit, whichever is smaller.

          Lessor's costs and expenses incurred by reason of Lessee's breach or
default shall include, without limitation, costs and expenses of receiving or
retaking possession of the Equipment, storing, holding, transporting, insuring,
caring for, servicing, maintaining and renting the Equipment or Items and
collecting rents and professional fees and expenses with respect to or incurred
by reason of the breach or default, including legal fees and expenses for advice
and legal services in any actions or proceedings which Lessor may commence or in
which Lessor may appear or participate to exercise or enforce any rights or
remedies or to protect or preserve any rights or interests, including but not
limited to attorneys' fees and costs incurred for representation in matters
arising under the bankruptcy statutes, including relief from stay motions and
motions concerning the assumption or rejection of executory contracts and leases
and in all reviews of and appeals from any such actions or proceedings.

          The "Default Rate" of interest shall be a rate per annum computed
monthly which shall be five (5) percentage points above the prime rate, but not
greater than the maximum rate, if any, limited by applicable law.  The "prime
rate" referred to in this Agreement shall mean the rate per annum announced by
Chase Manhattan Bank, New York City, from time to time as its prime rate,
whether or not such rate is applied by said bank to any then outstanding loans,
changing with each announced change of such prime rate.

          19. RIGHTS CUMULATIVE

          Unless otherwise expressly provided herein, all rights and remedies of
Lessor are concurrent and cumulative.  The exercise or partial exercise of any
remedy shall not restrict Lessor from further exercise of that remedy or any
other remedy.

          20. NON-WAIVER

          Neither the acceptance by Lessor of any payment or any other
performance, nor any act or failure of Lessor to act or to exercise any rights,
remedies or options in any one or more instances shall constitute a waiver of
any such right, remedy or option or of any other then existing or thereafter
accruing right, remedy or option, or of any breach or default then existing or
thereafter occurring. No purported waiver by Lessor of any right, remedy,
option, breach or default shall be binding unless in writing and signed by an
officer of Lessor.  A written waiver by Lessor of any right, remedy, option,
breach or default shall not constitute a waiver of any other then existing or
thereafter accruing right, remedy or option or of any other then existing or
thereafter occurring breach or default.

          21. NOTICES; PAYMENTS

          (a) A written notice may be given:  (i) by personal delivery of the
same to a corporate officer of the party to whom it is directed (the
"Addressee"), or to a general partner if the Addressee is a partnership, or to a
member of a limited liability company, or to the owner if the Addressee is a
sole proprietorship; (ii) by mailing the notice to the Addressee by first class
mail, registered or certified, with postage prepaid, addressed to the Addressee
at the address following its name in the opening paragraph of this Agreement or
to such other address as Addressee may specify by notice in writing given in
accordance with this Section; or (iii) by overnight courier service.  Notice
shall be effective upon delivery if sent pursuant to (i), effective three (3)
days after mailing, or effective the next day if sent by overnight courier.  A
"business day" shall be any day that is not a Saturday or Sunday or a legal
holiday.
          (b) The Lessee shall make all payments to Lessor at the place where
the notice is to be mailed to Lessor pursuant to (a).  Payments are deemed paid
when received by Lessor.

                                  Page 6 of 8
<PAGE>
 
          22. ASSIGNMENT

          (a) LESSEE WILL NOT SUBLEASE OR LEND ANY ITEM OR SELL, ASSIGN,
TRANSFER OR GRANT A SECURITY INTEREST IN ALL OR ANY PART OF ITS INTERESTS IN THE
EQUIPMENT OR ANY LEASE WITHOUT THE PRIOR WRITTEN CONSENT OF LESSOR.  Lessor's
consent to an assignment, sublease, transfer, sale or grant in any one or more
instances shall not impose any obligation upon Lessor to consent to any other or
further assignments.  Lessor's consent to an assignment, sublease, transfer,
sale or grant shall not release Lessee from any obligations with respect to the
Lease unless expressly so stated in the written consent.

          (b) All rights of Lessor hereunder may be assigned, pledged,
mortgaged, transferred or otherwise disposed of, either in whole or in part,
without notice to Lessee but subject always to the rights of Lessee under this
Lease.  If Lessee is given notice of any such assignment, Lessee shall
acknowledge receipt thereof in writing.  If Lessor assigns this Agreement or any
Lease or the rent due or to become due hereunder or any other interest herein,
whether as security for any of its indebtedness or otherwise, no breach or
default by Lessor hereunder or pursuant to any other agreement between Lessor
and Lessee, shall excuse performance by Lessee of any provision hereof or give
rise to any defense, counterclaim or set off, with respect to Lessee's
obligations under the Lease, it being understood that in the event of such
default or breach by Lessor that Lessee shall pursue any rights on account
thereof solely against Lessor through a claim for damages.  No such assignee
shall be obligated to perform any duty, covenant or condition required to be
performed by Lessor under the terms of this Agreement.

          23. SURVIVAL

          The representations, warranties, indemnities and agreements of Lessee,
and Lessee's obligations under any and all provisions of this Agreement, shall
survive the expiration or other termination of this Agreement, shall be binding
upon its successors and assigns and are expressly made for the benefit of and
shall be enforceable by Lessor and its successors and assigns.

          24. MISCELLANEOUS

          (a) The term "Lessor" shall mean the Lessor named herein and its
successors and assigns.

          (b) Whenever the context so requires, any pronoun gender includes all
other genders, and the singular includes the plural.  If more than one person
constitute Lessee, whether as a partnership or otherwise, all such persons are
and shall be jointly and severally liable for all agreements, undertakings and
obligations of Lessee.

          (c) All captions and section, paragraph and other divisions and
subdivisions are for convenience of reference only and shall not affect the
construction, interpretation or meaning of this Agreement or any Lease or of any
of the provisions thereof.

          (d) THIS LEASE SHALL BE GOVERNED BY AND CONSTRUED ACCORDING TO THE
LAWS OF THE STATE OF WASHINGTON, WITHOUT REGARD TO THE CONFLICTS OF LAWS
PROVISIONS THEREOF.

          (e) This Lease shall be binding upon and, except as limited in Section
22 hereof, shall inure to the benefit of Lessor and Lessee and their respective
successors and assigns.

          (f) THIS LEASE CANNOT BE CANCELLED OR TERMINATED EXCEPT AS EXPRESSLY
PROVIDED HEREIN.

          (g) Lessee's obligation to pay or reimburse Lessor for expenses as
provided hereunder shall be limited to reasonable expenses.

          (h) LESSEE AND LESSOR EACH WAIVES FOR ITSELF AND ITS RESPECTIVE
SUCCESSORS AND ASSIGNS ANY RIGHT TO A TRIAL BY JURY WITH RESPECT TO ANY MATTER
ARISING UNDER THIS AGREEMENT, ANY LEASE OR OTHER RELATED DOCUMENT.

          (i) Lessee hereby authorizes Lessor, in such jurisdictions where
such action is authorized by law, to execute financing statements regarding the
Equipment on Lessee's behalf or to effect recordation or filing of such
financing statements without Lessee's signature thereon.

          (j) For all purposes hereof, "day" shall mean a calendar day.
 
          25.  ARTICLE 2A WAIVERS

          If Article 2A of the Uniform Commercial Code is adopted under
applicable state law and applies to this Agreement or to any Lease, then Lessee,
to the extent permitted by law, waives any and all rights and remedies conferred
upon a lessee by Sections 2A-508 through 2A-522 of such Article 2A, including,
but not limited to, Lessee's rights to:

          (i)   cancel or repudiate this Agreement or a Lease;

          (ii)  reject or revoke acceptance of the Equipment;

          (iii) claim, grant or permit attachment of a security interest in
the Equipment in Lessee's possession or control for any reason;

          (iv)  deduct from Interim or Periodic Rental payments, or other
amounts due hereunder, all or any part of any claimed damages resulting from
Lessor's default, if any, under this Agreement or any Lease;

          (v)   accept partial delivery of the Equipment or an Item
thereof;

          (vi)  "cover" by making any purchase or lease of or contract to
purchase or lease equipment in substitution for Equipment designated in this
Agreement or any Lease; and

          (vii) obtain specific performance, replevin, detinue,
sequestration, claim and delivery or the like for any Equipment identified in
any Lease.  To the extent permitted by applicable law, Lessee also hereby waives
any rights now or hereafter conferred by statute or otherwise which may require
Lessor to sell, lease or otherwise use or dispose of any Equipment in mitigation
of Lessor's damages or which may otherwise limit or modify any of Lessor's
rights or remedies.

                                  Page 7 of 8
<PAGE>
 
          26.  ENTIRE AGREEMENT

          This Agreement, applicable Leases, Certificates of Acceptance and
Closing Schedules shall constitute the entire agreement between the parties and
shall not be altered or amended except by an agreement in writing signed by the
parties hereto or their successors or assigns.

          IN WITNESS WHEREOF Lessor and Lessee have signed this agreement as of
the day and year first hereinabove written.

LESSOR:                                     LESSEE:
 
METLIFE CAPITAL, LIMITED                    POWER INTEGRATIONS, INC.
 PARTNERSHIP
   By:  MetLife Capital Corporation
   Its: General Partner
 
     /s/ Mitchell J. Stevens                     /s/ Robert G.Staples
By: ________________________________        By: _______________________________

             Vice President
Its: _______________________________        Its: ______________________________
      
                                            By: _______________________________

                                            Its:_______________________________
 
Date Signed:       July 31, 1998
             ________________________
<PAGE>
 
                            EQUIPMENT LEASE NO. ONE
                                 Incorporating
          Master Equipment Lease Agreement dated ____________________


     THIS EQUIPMENT LEASE is entered into the ______ day of _______________,
19___ between METLIFE CAPITAL CORPORATION ("Lessor") whose mailing address is C-
97550, Bellevue, Washington 98009 and POWER INTEGRATIONS, INC. ("Lessee") whose
address is 477 NORTH MATHILDA AVENUE, SUNNYVALE, CA 94086

1.  General
    -------

    Lessor hereby leases to Lessee and Lessee hereby leases from Lessor each
    Item accepted under this Lease on the terms and conditions set forth in
    this Lease and the above Master Equipment Lease Agreement (the
    "Agreement"). Lessor and Lessee hereby affirm the Agreement and
    incorporate its terms in this Lease by this reference. Various terms used
    in each of the two documents are defined with reference to the other.

2.  Equipment Description
    ---------------------

    Set forth below or in Exhibit A attached hereto:

<TABLE>
<CAPTION>
NAME AND ADDRESS                                                COMPLETE DESCRIPTION OF EQUIPMENT
OF SUPPLIER                              QUANTITY               (NEW UNLESS OTHERWISE SPECIFIED)                PRICE
- -----------------------------------------------------------------------------------------------------------------------------
<S>                                      <C>       <C>                                                          <C>
 
 
 
                                                                                                              ---------------
                                                   TOTAL PRICE                                                  
                                                 ----------------------------------------------------------------------------
                                                   FED. EXCISE TAX                                              $
                                                 ----------------------------------------------------------------------------
                                                   TRANSPORTATION                                               $
                                                 ----------------------------------------------------------------------------
                                                   OTHER                                                        $
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>

3.  Recovery Period Category for Federal Tax Purposes:  Five (5) year  property
    --------------------------------------------------                         
(See Section 10(b) of the Agreement)

4.  Cost and Date Limitations
    -------------------------

    The Total Cost of all Equipment accepted under this Lease (including
    manufacturer's invoice cost plus taxes, freight, installation and related
    costs approved by Lessor) shall not exceed _____________. No Item may be
    accepted under this Lease after _________, ("Purchase Cut-Off Date").

5.  Rent
    ----
 
    Lessee will pay rent for each Item in the number of consecutive payments as
    shown below. Rent payments will be due and payable on each rent payment date
    during the Item's Lease Term. Each periodic rent payment will equal the
    Item's Total Cost (as specified in its Certificate of Acceptance) times the
    Periodic Rental Rate shown below.

      Interim Rent:
        Interim Rental Rate: ______________ (____%) percentage point(s) above 
        -------------------  ----------------------
        30 Day Commercial Paper


      Periodic Rent:
      ------------- 
        Number of rent payments: _____ (__)
                                 ----------
        Rent Payment Factor (for each installment): _______% percent (%) of
                                                    --------
        Lessor's Cost of the Equipment**

        Payment Schedule:         MONTHLY IN ARREARS
                           -------------------------------------
        Basic Term Length:             
                           -------------------------------------
                                        
        **RENTAL ADJUSTMENT: The rental factor(s) expressed above as a
        percentage of Equipment Cost will be adjusted at lease closing in
        accordance with the following formula:

        The rental factor will be converted to a simple interest equivalent rate
        that is then increased or decreased 1% for each 1% (or pro rata for any
        fraction of 1%) change in the average yield of Three year U.S. Treasury
        Constant Maturities (as published in Federal Reserve Statistical Release
        H.15[519]) from the complete one week period immediately preceding the
        date of lease closing.
<PAGE>
 
     Section 16. LESSEE'S OPTIONS AT EXPIRATION OF LEASE TERM of the Master
                 --------------------------------------------              
     Equipment Lease Agreement, and only with respects to Equipment Lease No.
     One, is amended to include the following changes:

     (a)  The reference to "One Hundred Twenty (120) days" is amended to "Ninety
          (90)" and the reference of "Lease" in the following sentence,
          "...following options with respect to all (but not less than all)
          Items covered by the Lease,..." is change to "Lease Closing
          Schedules".
     (b)  The reference to "the continental United States" is amended to
          "California".

     Section 16. LESSEE'S OPTIONS AT EXPIRATION OF LEASE TERM of the Master
                 --------------------------------------------              
     Equipment Lease Agreement, and only with respects to Equipment Lease No.
     One, is amended to include the following additional paragraph:

        (d) Provided that the lease term of the Equipment described in the
     Schedule has not been terminated and that no Event of Default under the
     Lease has occurred and is continuing, Lessee shall have the option to
     purchase all but not less than all of the Equipment at the end of the 48th
     month thereof (the "Early Purchase Option Date") for an amount (the "Early
                        ---------------------------                       -----
     Purchase Option Price"), payable in immediately available funds, equal to
     ---------------------                                                    
     THIRTY-ONE AND 09/100 percent (31.09%) of the Acquisition Cost, plus an
     amount equal to all sales or excise taxes on or measured by the sale of the
     Equipment to Lessee, and provided further that Lessee shall have notified
     Lessor in writing of Lessee's intention to exercise such option not more
     than ninety (90) nor less than sixty (60) days prior to the Early Purchase
     Option Date.  Such option shall be exercisable only on the Early Purchase
     Option Date and at no other time.  If the Early Purchase Option Price of
     the Equipment has not been paid to Lessor on the Early Purchase Option
     Date, Lessee shall continue to pay rent for the Equipment as specified in
     the Lease.

   A COMPLETE EQUIPMENT LIST WILL BE REVIEWED BY LESSOR'S ASSET MANAGEMENT
   DEPARTMENT PRIOR TO CLOSING TO ENSURE THAT THE ECONOMICS OF THE TRANSACTION
   HAVE BEEN MAINTAINED. A CHANGE IN THE ECONOMICS MAY RESULT IN AN ADJUSTMENT
   OF THE RENTAL FACTOR AND/OR THE EARLY PURCHASE OPTION PRICE DISCLOSED ABOVE.

6.  Sales/Use Tax
    -------------

    Sales or use tax shall be payable by Lessee on or along with each rent
    payment or upfront or Lessee will attach its sales/use tax exemption
    certificate, if applicable.

7. Required Documents
   ------------------

   Unless Lessor shall have given written approval for partial payment, Lessor
   will be obligated to pay the Total Cost of any Item only when it has received
   and approved the following true and correct documents:

     (a)  A Certificate of Acceptance for the Item signed by Lessee.

     (b)  An original invoice from the vendor of the Item showing its Total
     Cost, or from Lessee if the transaction is a sale and leaseback of the
     Item.

     (c) If the invoice for the Item shows Lessee rather than Lessor as the
     "sold to" party, an assignment of the Lessee's purchase order, or, in
     Lessor's discretion a bill of sale for the Item from the vendor of the Item
     to Lessor, or from Lessee if the transaction is a sale and leaseback of the
     Item, in form and substance satisfactory to Lessor.

     (d) An authorizing board resolution and incumbency certificates or other
     authorization acceptable to Lessor.

     (e) If required by Lessor, a Guaranty of Lessee's obligations under this
     Lease together with authorizing board or partnership resolution of the
     guarantor.

     (f)  The certificates of insurance or copies of policies required by
     Section 9 of the Agreement.

     (g) Uniform Commercial Code Financing Statement(s) as prepared by Lessor
     and signed by Lessee.

     (h) Such other documents as Lessor may reasonably request, including
     without limitation appropriate filings and notices if the transaction is a
     sale and leaseback of the Item.

     (i)   Partial Payment Authorization (if applicable).

8. Closing Schedules.
   ------------------

   Lessor shall send Lessee one or more Closing Schedules with respect to this
   Lease setting forth any adjustments to Equipment description, payment
   schedules, stipulated loss values and other matters.

LESSOR:                                  LESSEE:
 
METLIFE CAPITAL CORPORATION              POWER INTEGRATIONS, INC.
 
By: ________________________________     By:_________________________________

            Vice President  
Its:________________________________     Its:________________________________
 
Date Signed:________________________

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                          10,708
<SECURITIES>                                    27,493
<RECEIVABLES>                                    6,821
<ALLOWANCES>                                     1,243
<INVENTORY>                                      9,017
<CURRENT-ASSETS>                                53,236
<PP&E>                                          15,849
<DEPRECIATION>                                   9,272
<TOTAL-ASSETS>                                  59,813
<CURRENT-LIABILITIES>                           15,119
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            12
<OTHER-SE>                                      42,541
<TOTAL-LIABILITY-AND-EQUITY>                    59,813
<SALES>                                         48,456
<TOTAL-REVENUES>                                49,856
<CGS>                                           26,865
<TOTAL-COSTS>                                   26,865
<OTHER-EXPENSES>                                13,560
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 329
<INCOME-PRETAX>                                 10,206
<INCOME-TAX>                                     1,735
<INCOME-CONTINUING>                              8,471
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,471
<EPS-PRIMARY>                                     0.70
<EPS-DILUTED>                                     0.65
        

</TABLE>


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