SUPERTEX INC
S-8 POS, 1999-09-29
SEMICONDUCTORS & RELATED DEVICES
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As filed with the Securities and Exchange Commission on September 29, 1999
                                                Registration No. 33-_____


     SECURITIES AND EXCHANGE COMMISSION
          Washington, D.C.  20549


                  Form S-8
           REGISTRATION STATEMENT
                   UNDER
         THE SECURITIES ACT OF 1933



               SUPERTEX, INC.
(Exact name of registrant as specified in its charter)

       CALIFORNIA     94-2328535
(State of incorporation)(IRS Employer Identification No.)
            1235 Bordeaux Drive
     Sunnyvale, California  94088-3607
  (Address of principal executive offices)


           1991 Stock Option Plan
          (Full Title of the Plan)

                HENRY C. PAO
                 President
               SUPERTEX, INC.
            1235 Bordeaux Drive
      Sunnyvale, California 94088-3607
  (Name and address of agent for service)

               (408) 744-0100
(Telephone number, including area code, of agent for service)


                 Copies to:
         THOMAS C. DEFILIPPS, ESQ.
     WILSON, SONSINI, GOODRICH & ROSATI, LP
          Professional Corporation
             650 Page Mill Road
      Palo Alto, California 94304-1050


<PAGE>
<TABLE>

                       CALCULATION OF REGISTRATION FEE

<CAPTION>

Title of           Amount to be       Proposed        Proposed Maximum    Amount of
Securities to      Registered         Maximum         Aggregate           Registration
be Registered                         Offering Price  Offering Price      Fee
                                      Per Share


<S>                <C>                <C>             <C>                 <C>

Shares             900,000            $15.1875<F1>    $13,668,750.00      $3,799.91
Available for
Future Option
Grant

<FN>
<F1>
Estimated solely for the purpose of calculating the amount of registration fee
on the basis of the average of the high and low price reported in the Nasdaq
National Market System on September 28, 1999.
</FN>
</TABLE>

<PAGE>
                  PART II

  INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


Item 3.  Information Incorporated by Reference.

  There are hereby incorporated by reference in this registration statement
the following documents and information heretofore filed with the Securities
and Exchange Commission:

  1.   The Company's Quarterly Report on Form 10-Q for the fiscal
quarter ended June 30, 1999, filed pursuant to Section 13 of the Securities
Exchange Act of 1934 (the "Exchange Act").

  2.   The Company's Annual Report on Form 10-K for the fiscal year
ended March 31, 1999, filed pursuant to Section 13 of the Exchange Act.

  3.   The Registration Statement on Form S-8, filed on November 1,
1991, pursuant to Section 5 of the Securities Act of 1933, as amended.

  4.   The Registration Statement on Form S-8, filed on September 1,
1995, pursuant to Section 5 of the Securities Act of 1933, as amended.

  All documents filed by the Company pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act, after the date of this registration statement and
prior to the filing of a post-effective amendment which indicates that all
securities offered have been sold or which deregisters all securities then
remaining unsold, shall be deemed to be incorporated by reference in this regis-
tration statement and to be part hereof from the date of filing such documents.


Item 4.  Description of Securities.

  Not applicable.


Item 5.  Interests of Named Experts and Counsel.

  Not applicable.


Item 6.  Indemnification of Directors and Officers.

  Section 317 of the California Corporations Code authorizes a court to
award, or a corporation's Board of Directors to grant, indemnity to directors
and officers in terms sufficiently broad to permit such indemnification under
certain circumstances for liabilities (including reimbursement for expenses
incurred) arising under the Securities Act.  The Company's Articles of
Incorporation, as amended, limit the liability of the Company's directors for
monetary damages arising from breach of their fiduciary duty, except to the
extent otherwise required by the California Corporations Code.  Article VI of
the Company's Bylaws provides for indemnification of the Company's directors,
officers, employees, and other agents to the maximum extent permitted by the
California Corporations Code.


Item 7.  Exemption from Registration Claimed.

  Not applicable.


Item 8.  Exhibits.

    Exhibit
     Number

        4.1        1991 Stock Option Plan, as amended and Form of
                   Stock Option Agreement
        5.1        Opinion of Wilson, Sonsini, Goodrich & Rosati, P.C.
       23.1        Consent of PricewaterhouseCoopers LLP
                   Independent Accountants
       23.2        Consent of Wilson, Sonsini, Goodrich & Rosati,
                   P.C. (contained in Exhibit 5.1)
       24.1        Power of Attorney (See Page 6)


Item 9.  Undertakings.

       (a)  The undersigned registrant hereby undertakes:

            (1)  To file, during any period in which offers or sales are
being made, a post-effective amendment to this Registration Statement:

                        (i)     To include any prospectus required by
            Section 10(a)(3) of the Securities Act of 1933;

                       (ii)     To reflect in the prospectus any facts or events
            arising after the effective date of the Registration Statement (or
            the most recent post-effective amendment thereof) which,
            individually or in the aggregate, represent a fundamental change
            in the information set forth in the Registration Statement;

                      (iii)     To include any material information with
            respect to the plan of distribution not previously disclosed in the
            Registration Statement or any material change to such
            information in the Registration Statement;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in the periodic reports filed by the registrant pursuant
to Section 13 or 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the registration statement.

            (2)  That, for the purpose of determining any liability under
the Securities Act, each such post-effective amendment shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

            (3)  To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold
at the termination of the offering.

       (b)  The undersigned registrant hereby undertakes that, for purposes
of determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

       (c)  Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers and controlling persons
of the registrant pursuant to the foregoing provisions, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable.  In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

<PAGE>
                       SIGNATURES


The Company

       Pursuant to the requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-8 and has duly caused this
registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Sunnyvale, State of California,
on September 24, 1999.


                           SUPERTEX, INC.


                           By:  Henry C. Pao
                                Henry C. Pao, President




             POWER OF ATTORNEY


       KNOW ALL PERSONS BY THESE PRESENTS, that each person
whose signature appears below constitutes and appoints Richard Siegel his
attorney-in-fact, with the power of substitution, for him in any and all
capacities, to sign any amendments to this Registration Statement on Form S-8,
and to file the same, with exhibits thereto and other documents in connection
therewith, with the Securities and Exchange Commission, hereby ratifying and
confirming all that said attorney-in-fact, or his substitute, may do or cause
to be done by virtue hereof.

<PAGE>
       Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.


SIGNATURE                      TITLE                                DATE

Henry C. Pao       President, Chief Executive Officer
(Henry C. Pao)     (Principal)Executive Officer), Chief       September 23, 1999
                   Financial Officer(Principal Financial
                   Officer) and Director

Jacqueline Limary  Controller                                 September 23, 1999
(Jacqueline Limary)(Principal Accounting Officer)


Benedict C. K. Choy   Senior Vice President, Secretary
(Benedict C. K. Choy) and Director                            September 23, 1999



Richard Siegel     Executive Vice President, and Director     September 23, 1999
(Richard Siegel)


Frank Pao          Director                                   September 23, 1999
(Frank Pao)


Yunni Pao          Director                                   September 23, 1999
(Yunni Pao)

<PAGE>
                               CONSENT OF COUNSEL



       The consent of Wilson, Sonsini, Goodrich & Rosati, Professional
Corporation, is contained in its opinion filed as Exhibit 5.1 to the
Registration
Statement.

<PAGE>
                               INDEX TO EXHIBITS


Exhibit Number               Description                   Sequentially
                                                           Numbered Page

4.1              1991 Stock Option Plan and Form of Stock
                 Option Agreement

5.1              Opinion of Wilson, Sonsini, Goodrich &
                 Rosati, P.C.

23.1             Consent of PricewaterhouseCoopers LLP,
                 Independent Accountants

23.2             Consent of Wilson, Sonsini, Goodrich &     Contained in
                 Rosati, P.C.                               Exhibit 5.1

24.1             Power of Attorney                          Page 6 of
                                                            Registration
                                                            Statement





[FN]
____________________

*      Incorporated by reference from exhibits to the Company's Annual Report
       on Form 10-K filed on June 16, 1999.
</FN>

                           SUPERTEX, INC.

                       1991 STOCK OPTION PLAN

                     (as amended August 6, 1999)

     1.   Purposes of the Plan.  The purposes of this Stock Option Plan are:

              to attract and retain the best available personnel for positions
              of substantial responsibility,

              to provide additional incentive to Employees and Consultants, and

              to promote the success of the Company's business.

Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time
of grant.

     2.   Definitions.  As used herein, the following definitions shall apply:

          (a)  "Administrator" means the Board or any of its
Committees as shall be administering the Plan, in accordance with Section 4
of the Plan.

          (b)  "Applicable Laws" means the legal requirements relating
to the administration of stock option plans under state corporate and securities
laws and the Code.

          (c)  "Board" means the Board of Directors of the Company.

          (d)  "Code" means the Internal Revenue Code of 1986, as amended.

          (e)  "Committee"  means a Committee appointed by the Board in
accordance with Section 4 of the Plan.

          (f)  "Common Stock" means the Common Stock of the Company.

          (g)  "Company" means Supertex, Inc., a California corporation.

          (h)  "Consultant" means any person, including an advisor,
engaged by the Company or a Parent or Subsidiary to render services and who
is compensated for such services, and any Director, whether compensated for
such services or not, provided that the term "Consultant" shall not include
Directors who are not compensated for their services as such or are paid only
a director's fee by the Company.

          (i)  "Continuous Status as an Employee or Consultant"
means the employment or consulting relationship is not interrupted or
terminated by the Company, any Parent or Subsidiary.  Continuous Status as
an Employee or Consultant shall not be considered interrupted in the case of:
(i) any leave of absence approved by the Board, including sick leave, military
leave, or any other personal leave; provided, however, that for purposes of
Incentive Stock Options, any such leave may not exceed ninety (90) days,
unless reemployment upon the expiration of such leave is guaranteed by
contract (including certain Company policies) or statute; or (ii) transfers
between locations of the Company or between the Company, its Parent, its
Subsidiaries or its successor.

          (j)  "Director" means a member of the Board.

          (k)  "Disability" means total and permanent disability as
defined in Section 22(e)(3) of the Code.

          (l)  "Employee" means any person, including officers and
directors, employed by the Company or any Parent or Subsidiary of the
Company.  Neither service as a Director nor payment of a director's fee by the
Company shall be sufficient to constitute "employment" by the Company.

          (m)  "Exchange Act" means the Securities Exchange Act of 1934,
as amended.

          (n)  "Fair Market Value" means, as of any date, the value of
Common Stock determined as follows:

                         (i)  If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
National Market System of the National Association of Securities Dealers, Inc.
Automated Quotation ("NASDAQ") System, the Fair Market Value of a Share
of Common Stock shall be the closing sales price for such stock (or the closing
bid, if no sales were reported) as quoted on such system or exchange (or the
exchange with the greatest volume of trading in Common Stock) on the last
market trading day prior to the day of determination, as reported in the Wall
Street Journal or such other source as the Administrator deems reliable;

                        (ii)  If the Common Stock is quoted on the
NASDAQ System (but not on the National Market System thereof) or
regularly quoted by a recognized securities dealer but selling prices are not
reported, the Fair Market Value of a Share of Common Stock shall be the
mean between the high bid and high asked prices for the Common Stock or on
the last market trading day prior to the day of determination, as reported in
the Wall Street Journal or such other source as the Administrator deems
reliable;

                       (iii)  In the absence of an established market for the
Common Stock, the Fair Market Value thereof shall be determined in good
faith by the Administrator.

          (o)  "Incentive Stock Option" means an Option intended to
qualify as an incentive stock option within the meaning of Section 422 of the
Code and the regulations promulgated thereunder.

          (p)  "Nonstatutory Stock Option" means an Option not
intended to qualify as an Incentive Stock Option.

          (q)  "Notice of Grant" means a written notice evidencing
certain terms and conditions of an individual Option grant.  The Notice of
Grant is part of the Option Agreement and is attached to it as Exhibit A.

          (r)  "Officer" means a person who is an officer of the
Company within the meaning of Section 16 of the Exchange Act and the rules
and regulations promulgated thereunder.

          (s)  "Option" means a stock option granted pursuant to the
Plan.

          (t)  "Option Agreement" means a written agreement
between the Company and an Optionee evidencing the terms and conditions
of an individual Option grant.  The Option Agreement is subject to the terms
and conditions of the Plan.

          (u)  "Optioned Stock" means the Common Stock subject to
an Option.

          (v)  "Optionee" means an Employee or Consultant who
holds an outstanding Option.

          (w)  "Parent" means a "parent corporation", whether now or
hereafter existing, as defined in Section 424(e) of the Code.

          (x)  "Plan" means this 1991 Stock Option Plan.

          (y)  "Rule 16b-3" means Rule 16b-3 of the Exchange Act or
any successor to Rule 16b-3, as in effect when discretion is being exercised
with respect to the Plan.

          (z)  "Share" means a share of the Common Stock, as
adjusted in accordance with Section 12 of the Plan.

         (aa)  "Subsidiary" means a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 424(f) of the Code.

     3.   Stock Subject to the Plan.  Subject to the provisions of Section
12 of the Plan, the maximum aggregate number of Shares which may be
optioned and sold under the Plan is 2,825,715 Shares of Common Stock.  The
Shares may be authorized, but unissued, or reacquired Common Stock.


          If an Option expires or becomes unexercisable without having
been exercised in full, the unpurchased Shares which were subject thereto shall
become available for future grant under the Plan (unless the Plan has
terminated).

     4.   Administration of the Plan.

          (a)  Procedure.

                         (i)  Multiple Administrative Bodies.  Different
Committees with respect to different groups of Optionees may administer the
Plan.
                        (ii)  Section 162(m).  To the extent that the
Administrator determines it to be desirable to qualify Options granted
hereunder as "performance-based compensation" within the meaning of Section
162(m) of the Code, the Plan shall be administered by a Committee of two or
more "outside directors" within the meaning of Section 162(m) of the code.

                       (iii)  Rule 16b-3.  To the extent desirable to qualify
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated
hereunder shall be structured to satisfy the requirements for exemption under
Rule 16b-3.

                        (iv)  Other Administration.  Other than as provided
above, the Plan shall be administered by (A) the Board or (B) a Committee, which
committee shall be constituted to satisfy Applicable Laws.

          (b)  Powers of the Administrator.  Subject to the provisions
of the Plan, and in the case of a Committee, subject to the specific duties
delegated by the Board to such Committee, the Administrator shall have the
authority, in its discretion:

                         (i)  to determine the Fair Market Value of the
Common Stock, in accordance with Section 2(m) of the Plan;

                        (ii)  to select the Consultants and Employees to
whom Options may be granted hereunder;

                       (iii)  to determine whether and to what extent
Options are granted hereunder;

                        (iv)  to determine the number of shares of Common
Stock to be covered by each Option granted hereunder;

                         (v)  to approve forms of agreement for use under the
Plan;

                        (vi)  to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any award granted hereunder.  Such
terms and conditions include, but are not limited to, the exercise price, the
time or times when Options may be exercised (which may be based on
performance
criteria), and any restriction or limitation, or any vesting acceleration or
waiver of forfeiture restrictions regarding any Option or the shares of Common
Stock relating thereto, based in each case on such factors as the Administrator,
in its sole discretion, shall determine;

                       (vii)  to determine whether, to what extent and under
what circumstances Common Stock and other amounts payable with respect
to an award under this Plan shall be deferred either automatically or at the
election of the participant (including providing for and determining the amount
(if any) of any deemed earnings on any deferred amount during any deferral
period);

                      (viii)  to reduce the exercise price of any Option to the
then current Fair Market Value if the Fair Market Value of the Common Stock
covered by such Option shall have declined since the date the Option was
granted;

                        (ix)  to construe and interpret the terms of the Plan;

                         (x)  to prescribe, amend and rescind rules and
regulations relating to the Plan;

                        (xi)  to modify or amend each Option (with the
consent of the Optionee);

                       (xii)  to authorize any person to execute on behalf of
the Company any instrument required to effect the grant of an Option
previously granted by the Administrator; and

                      (xiii)  to determine the terms and restrictions
applicable to Options.

                       (xiv)  to make all other determinations deemed
necessary or advisable for administering the Plan.

          (c)  Effect of Administrator's Decision.  The Administrator's
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options.

     5.   Eligibility.  Nonstatutory Stock Options may be granted only
to Employees and Consultants.  Incentive Stock Options may be granted only
to Employees.  If otherwise eligible, an Employee or Consultant who has been
granted an Option may be granted additional Options.

     6.   Limitations.

          (a)  Each Option shall be designated in the Notice of Grant
as either an Incentive Stock Option or a Nonstatutory Stock Option.
However, notwithstanding such designations, to the extent that the aggregate
Fair Market Value:

               (i) of Shares subject to an Optionee's incentive stock
          options granted by the Company, any Parent or Subsidiary,
          which (ii) become exercisable for the first time during any
          calendar year (under all plans of the Company or any Parent or
          Subsidiary)

exceeds $100,000, such excess Options shall be treated as Nonstatutory Stock
Options.  For purposes of this Section 6(a), incentive stock options shall be
taken into account in the order in which they were granted, and the Fair
Market Value of the Shares shall be determined as of the time of grant.

          (b)  Neither the Plan nor any Option agreement shall confer
upon an Optionee any right with respect to continuing the Optionee's
employment or consulting relationship with the Company, nor shall they
interfere in any way with the Optionee's right or the Company's right to
terminate such employment or consulting relationship at any time, with or
without cause.

          (c)  The following limitations shall apply to grants of Options:

                        (i) No Optionee shall be granted, in any fiscal year
    of the Company, Options to purchase more than 125,000 Shares.

                       (ii) The foregoing limitation shall be adjusted
    proportionately in connection with any change in the Company's
    capitalization as described in Section 12.

                      (iii) If an Option is cancelled in the same fiscal
    year of the Company in which it was granted (other than in connection
    with a transaction described in Section 12), the cancelled Option will
    be counted against the limit set forth in subsection (i) above.  For
    this purpose, if the exercise price of an Option is reduced, the
    transaction will be treated as a cancellation of the Option and the
    grant of a new Option.

     7.   Term of Plan.  Subject to Section 19 of the Plan, the Plan shall
become effective upon the earlier to occur of its adoption by the Board or its
approval by the shareholders of the Company as described in Section 19 of the
Plan.  It shall continue in effect for a term of ten (10) years unless
terminated earlier under Section 14 of the Plan.

     8.   Term of Option.  The term of each Option shall be stated in the
Notice of Grant; provided, however, that in the case of an Incentive Stock
Option, the term shall be ten (10) years from the date of grant or such shorter
term as may be provided in the Notice of Grant.  However, in the case of an
Option granted to an Optionee who, at the time the Option is granted, owns
stock representing more than ten percent (10%) of the voting power of all
classes of stock of the Company or any Parent or Subsidiary, the term of the
Option shall be five (5) years from the date of grant or such shorter term as
may be provided in the Notice of Grant.

     9.   Option Exercise Price and Consideration.

          (a)  Exercise Price.  The per share exercise price for the
Shares to be issued pursuant to exercise of an Option shall be determined by
the Administrator, subject to the following:

                         (i)  In the case of an Incentive Stock Option

                              (A)  granted to an Employee who, at the time
of the grant of such Incentive Stock Option, owns stock representing more
than ten percent (10%) of the voting power of all classes of stock of the
Company or any Parent or Subsidiary, the per Share exercise price shall be no
less than 110% of the Fair Market Value per Share on the date of grant.

                              (B)  granted to any Employee, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share
on the date of grant.

                        (ii)  In the case of a Nonstatutory Stock Option
granted to any person, the per Share exercise price shall be no less than 50%
of the Fair Market Value per Share on the date of grant.  In the case of
Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share
on the date of grant.

          (b)  Waiting Period and Exercise Dates.  At the time an
Option is granted, the Administrator will determine the terms and conditions
to be satisfied before Shares may be purchased, including the dates on which
Shares subject to the Option may first be purchased.  The Administrator may
specify that an Option may not be exercised until the completion of the service
period specified at the time of grant.  At the time an Option is granted, the
Administrator shall fix the period within which the Option may be exercised.

          (c)  Form of Consideration.  The Administrator shall
determine the acceptable form of consideration for exercising an Option,
including the method of payment.  In the case of an Incentive Stock Option,
the Administrator shall determine the acceptable form of consideration at the
time of grant.  Such consideration may consist entirely of:

                         (i)  cash,

                        (ii)  check, or

                       (iii)  other Shares which (a) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for
more than six months on the date of surrender, or were not acquired directly
or indirectly from the Company and (b) have a Fair Market Value on the date
of surrender equal to the aggregate exercise price of the Shares as to which
said Option shall be exercised.

     10.  Exercise of Option.

          (a)  Procedure for Exercise; Rights as a Shareholder.  Any
Option granted hereunder shall be exercisable according to the terms of the
Plan and at such times and under such conditions as determined by the
Administrator.

               An Option may not be exercised for a fraction of a
Share.
               An Option shall be deemed exercised when the
Company receives: (i) written notice of exercise (in accordance with the
Option Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised.  Full
payment may consist of any consideration and method of payment authorized
by the Administrator and permitted by the Option Agreement and the Plan.
Shares issued upon exercise of an Option shall be issued in the name of the
Optionee or, if requested by the Optionee, in the name of the Optionee and his
or her spouse.  Until the stock certificate evidencing such Shares is issued (as
evidenced by the appropriate entry on the books of the Company or of a duly
authorized transfer agent of the Company), no right to vote or receive
dividends or any other rights as a shareholder shall exist with respect to the
Optioned Stock, notwithstanding the exercise of the Option.  The Company
shall issue (or cause to be issued) such stock certificate promptly after the
Option is exercised.  No adjustment will be made for a dividend or other right
for which the record date is prior to the date the stock certificate is issued,
except as provided in Section 13 of the Plan.

               Exercising an Option in any manner shall decrease the
number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

          (b)  Termination of Employment or Consulting Relationship.
In the event an Optionee's Continuous Status as an Employee or Consultant
terminates (other than upon the Optionee's death or Disability), the Optionee
may exercise his or her Option, but only within such period of time as is
determined by the Administrator, and only to the extent that the Optionee was
entitled to exercise it at the date of termination (but in no event later than
the expiration of the term of such Option as set forth in the Notice of Grant).
In the case of an Incentive Stock Option, the Administrator shall determine
such
period of time (in no event to exceed ninety (90) days from the date of
termination) when the Option is granted.  If, at the date of termination, the
Optionee is not entitled to exercise his or her entire Option, the Shares
covered by the unexercisable portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified herein, the Option shall terminate, and the Shares covered by
such Option shall revert to the Plan.

          (c)  Disability of Optionee.  In the event an Optionee's
Continuous Status as an Employee or Consultant terminates as a result of the
Optionee's Disability, the Optionee may exercise his or her Option, but only
within twelve (12) months from the date of such termination, and only to the
extent that the Optionee was entitled to exercise it at the date of such
termination (but in no event later than the expiration of the term of such
Option as set forth in the Notice of Grant).  If, at the date of termination,
the Optionee is not entitled to exercise his or her entire Option, the Shares
covered by the unexercisable portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified herein, the Option shall terminate, and the Shares covered
by such Option shall revert to the Plan.

          (d)  Death of Optionee.  In the event of the death of an
Optionee, the Option may be exercised, at any time within twelve (12) months
following the date of death (but in no event later than the expiration of the
term of such Option as set forth in the Notice of Grant), by the Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance, but only to the extent the Optionee was entitled to exercise the
Option at the date of death.  If, at the time of death, the Optionee was not
entitled to exercise his or her entire Option, the Shares covered by the
unexercisable portion of the Option shall revert to the Plan.  If, after death,
the Optionee's estate or a person who acquired the right to exercise the Option
by bequest or inheritance does not exercise the Option within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.

     11.  Non-Transferability of Options.  Options may not be sold,
pledged, assigned, hypothecated, transferred or disposed of in any manner
other than by will or by the laws of descent and distribution or pursuant to a
qualified domestic relations order as defined by the Code or Title I of the
Employee Retirement Income Security Act, or the rules thereunder.  The
designation of a beneficiary by an Optionee does not constitute a transfer.  An
Option may be exercised, during the lifetime of the Optionee, only by the
Optionee or a transferee permitted by this Section 11.

     12.  Adjustments Upon Changes in Capitalization, Dissolution,
          Merger, Asset Sale or Change of Control.

          (a)  Changes in Capitalization.  Subject to any required
action by the shareholders of the Company, the number of shares of Common
Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as
to which no Options have yet been granted or which have been returned to the
Plan upon cancellation or expiration of an Option, as well as the price per
share of Common Stock covered by each such outstanding Option, shall be
proportionately adjusted for any increase or decrease in the number of issued
shares of Common Stock resulting from a stock split, reverse stock split, stock
dividend, combination or reclassification of the Common Stock, or any other
increase or decrease in the number of issued shares of Common Stock effected
without receipt of consideration by the Company; provided, however, that
conversion of any convertible securities of the Company shall not be deemed
to have been "effected without receipt of consideration."  Such adjustment
shall be made by the Board, whose determination in that respect shall be final,
binding and conclusive.  Except as expressly provided herein, no issuance by
the Company of shares of stock of any class, or securities convertible into
shares of stock of any class, shall affect, and no adjustment by reason thereof
shall be made with respect to, the number or price of shares of Common Stock
subject to an Option.

          (b)  Dissolution or Liquidation.  In the event of the proposed
dissolution or liquidation of the Company, to the extent that an Option has not
been previously exercised, it will terminate immediately prior to the
consummation of such proposed action.  The Board may, in the exercise of its
sole discretion in such instances, declare that any Option shall terminate as of
a date fixed by the Board and give each Optionee the right to exercise his
Option as to all or any part of the Optioned Stock, including Shares as to
which the Option would not otherwise be exercisable.

          (c)  Merger or Asset Sale.  Subject to the provisions of
paragraph (d) hereof, in the event of a merger of the Company with or into
another corporation, or the sale of substantially all of the assets of the
Company, each outstanding Option shall be assumed or an equivalent option
or right shall be substituted by the successor corporation or a Parent or
Subsidiary of the successor corporation.  In the event that the successor
corporation does not agree to assume the Option or to substitute an equivalent
option, the Administrator shall, in lieu of such assumption or substitution,
provide for the Optionee to have the right to exercise the Option to the extent
the Option would have been exercisable 180 days after the effective date of the
merger or sale of assets.  If the Administrator makes an Option exercisable in
lieu of assumption or substitution in the event of a merger or sale of assets as
provided in the previous sentence, the Administrator shall notify the Optionee
that the Option shall be exercisable for a period of fifteen (15) days from the
date of such notice, and the Option will terminate upon the expiration of such
period.  For the purposes of this paragraph, the Option shall be considered
assumed if, following the merger or sale of assets, the option confers the right
to purchase, for each Share of Optioned Stock subject to the Option
immediately prior to the merger or sale of assets, the consideration (whether
stock, cash, or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the effective date
of the transaction (and if holders were offered a choice of consideration, the
type of consideration chosen by the holders of a majority of the outstanding
Shares); provided, however, that if such consideration received in the merger
or sale of assets was not solely common stock of the successor corporation or
its Parent, the Administrator may, with the consent of the successor
corporation and the participant, provide for the consideration to be received
upon the exercise of the Option, for each Share of Optioned Stock subject to
the Option, to be solely common stock of the successor corporation or its
Parent equal in Fair Market Value to the per share consideration received by
holders of Common Stock in the merger or sale of assets.

     13.  Date of Grant.  The date of grant of an Option shall be, for all
purposes, the date on which the Administrator makes the determination
granting such Option, or such other later date as is determined by the
Administrator.  Notice of the determination shall be provided to each Optionee
within a reasonable time after the date of such grant.

     14.  Amendment and Termination of the Plan.

          (a)  Amendment and Termination.  The Board may at any
time amend, alter, suspend or terminate the Plan.

          (b)  Shareholder Approval.  The Company shall obtain
shareholder approval of any Plan amendment to the extent necessary and
desirable to comply with Rule 16b-3 or with Section 422 of the Code (or any
successor rule or statute or other applicable law, rule or regulation, including
the requirements of any exchange or quotation system on which the Common
Stock is listed or quoted).  Such shareholder approval, if required, shall be
obtained in such a manner and to such a degree as is required by the applicable
law, rule or regulation.

          (c)  Effect of Amendment or Termination.  No amendment,
alteration, suspension or termination of the Plan shall impair the rights of any
Optionee, unless mutually agreed otherwise between the Optionee and the
Administrator, which agreement must be in writing and signed by the Optionee
and the Company.

     15.  Conditions Upon Issuance of Shares.

          (a)  Legal Compliance.  Shares shall not be issued pursuant
to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares shall comply with all relevant provisions
of law, including, without limitation, the Securities Act of 1933, as amended,
the Exchange Act, the rules and regulations promulgated thereunder, and the
requirements of any stock exchange or quotation system upon which the
Shares may then be listed or quoted, and shall be further subject to the
approval of counsel for the Company with respect to such compliance.

          (b)  Investment Representations.  As a condition to the
exercise of an Option, the Company may require the person exercising such
Option to represent and warrant at the time of any such exercise that the
Shares are being purchased only for investment and without any present
intention to sell or distribute such Shares if, in the opinion of counsel for
the Company, such a representation is required by any of the aforementioned
relevant provisions of law.

     16.  Liability of Company.

          (a)  Inability to Obtain Authority.  The inability of the
Company to obtain authority from any regulatory body having jurisdiction,
which authority is deemed by the Company's counsel to be necessary to the
lawful issuance and sale of any Shares hereunder, shall relieve the Company of
any liability in respect of the failure to issue or sell such Shares as to which
such requisite authority shall not have been obtained.

          (b)  Grants Exceeding Allotted Shares.  If the Optioned
Stock covered by an Option exceeds, as of the date of grant, the number of
Shares which may be issued under the Plan without additional shareholder
approval, such Option shall be void with respect to such excess Optioned
Stock, unless shareholder approval of an amendment sufficiently increasing the
number of Shares subject to the Plan is timely obtained in accordance with
Section 14(b) of the Plan.

     17.  Reservation of Shares.  The Company, during the term of this
Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

     18.  Shareholder Approval.  Continuance of the Plan shall be subject
to approval by the shareholders of the Company within twelve (12) months
before or after the date the Plan is adopted.  Such shareholder approval shall
be obtained in the manner and to the degree required under applicable federal
and state law.

     19.  Information to Optionees.  The Company shall provide each
Optionee, while such Optionee has one or more Options outstanding, with
copies of all annual reports and other information which are provided to all
shareholders of the Company. The Company shall not be required to provide
such information if the issuance of Options under the Plan is limited to key
employees whose duties in connection with the Company assure their access
to equivalent information.

<PAGE>

                            SUPERTEX, INC.

                       STOCK OPTION AGREEMENT



     1.   Grant of Option.  The Plan Administrator of Supertex, Inc., a
California corporation (the "Company"), hereby grants to the Optionee (the
"Optionee") named in the Notice of Grant (part of, and attached as Exhibit A
to, this Option Agreement), an option (the "Option") to purchase a number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the 1991 Stock Option Plan (the "Plan") adopted by the
Company, which is incorporated herein by reference.  Subject to Section 15(c)
of the Plan, in the event of a conflict between the terms and conditions of the
Plan and the terms and conditions of this Option Agreement, the terms and
conditions of the Plan shall prevail.  Unless otherwise defined herein, the
terms defined in the Plan shall have the same defined meanings in this Option
Agreement.

          If designated in the Notice of Grant as an Incentive Stock
Option, this Option is intended to qualify as an Incentive Stock Option under
Section 422 of the Code.

     2.   Exercise of Option.

          (a)  Right to Exercise.  This Option is exercisable during its
term in accordance with the Vesting Schedule set out in the Notice of Grant
and the applicable provisions of the Plan and this Option Agreement.  In the
event of Optionee's death, Disability or other termination of Optionee's
employment or consulting relationship, the exercisability of the Option is
governed by the applicable provisions of the Plan and this Option Agreement.

          (b)  Method of Exercise.  This Option is exercisable by
delivery of an exercise notice, in the form attached as Exhibit B (the "Exercise
Notice"), which shall state the election to exercise the Option, the number of
Shares in respect of which the Option is being exercised (the "Exercised
Shares"), and such other representations and agreements as to the holder's
investment intent with respect to the Exercised Shares as may be required by
the Company pursuant to the provisions of the Plan.  The Exercise Notice shall
be signed by the Optionee and, if the Optionee is married, by the Optionee's
spouse, and shall be delivered in person or by certified mail to the Secretary
of the Company.  The Exercise Notice shall be accompanied by payment of the
aggregate Exercise Price as to all Exercised Shares.  This Option shall be
deemed to be exercised upon receipt by the Company of such fully executed
Exercise Notice accompanied by such aggregate Exercise Price.

          No Shares shall be issued pursuant to the exercise of this
Option unless such issuance and exercise complies with all relevant provisions
of law and the requirements of any stock exchange upon which the Shares are
then listed.  Assuming such compliance, for income tax purposes the Exercised
Shares shall be considered transferred to the Optionee on the date the Option
is exercised with respect to such Exercised Shares.

     3.   Method of Payment.  Payment of the aggregate Exercise Price
shall be by any of the following, or a combination thereof, at the election of
the Optionee:

          (a)  cash;

          (b)  check; or

          (c)  other Shares which (a) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than
six months on the date of surrender, or were not acquired directly or indirectly
from the Company and (b) have a Fair Market Value on the date of surrender
equal to the aggregate exercise price of the Shares as to which said Option
shall be exercised.

     4.   Non-Transferability of Option.  This Option may not be
transferred in any manner otherwise than by will or by the laws of descent or
distribution or pursuant to a qualified domestic relations order and may be
exercised during the lifetime of Optionee only by the Optionee.  The terms of
the Plan and this Option Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

     5.   Term of Option.  This Option may be exercised only within the
term set out in the Notice of Grant, and may be exercised during such term
only in accordance with the Plan and the terms of this Option Agreement.

     6.   Tax Consequences.  Some of the federal and California tax
consequences relating to this Option, as of the date of this Option, are set
forth below.  THIS SUMMARY IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND
REGULATIONS ARE SUBJECT TO CHANGE.  THE OPTIONEE SHOULD CONSULT A TAX
ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

          (a)  Exercising the Option.

                         (i)  Nonqualified Stock Option ("NSO").  If this
Option does not qualify as an ISO, the Optionee may incur regular federal
income tax and California income tax liability upon exercise.  The Optionee
will be treated as having received compensation income (taxable at ordinary
income tax rates) equal to the excess, if any, of the fair market value of the
Exercised Shares on the date of exercise over their aggregate Exercise Price.
If the Optionee is an employee, the Company will be required to withhold from
his or her compensation or collect from Optionee and pay to the applicable
taxing authorities an amount equal to a percentage of this compensation
income at the time of exercise.

                        (ii)  Incentive Stock Option ("ISO").  If this Option
qualifies as an ISO, the Optionee will have no regular federal income tax or
California income tax liability upon its exercise, although the excess, if any,
of the fair market value of the Exercised Shares on the date of exercise over
their aggregate Exercise Price will be treated as an adjustment to the
alternative minimum tax for federal tax purposes and may subject the Optionee
to
alternative minimum tax in the year of exercise.

          (b)  Disposition of Shares.

                         (i)  NSO.  If the Optionee holds NSO Shares for at
least one year, any gain realized on disposition of the Shares will be treated
as long-term capital gain for federal income tax purposes.

                        (ii)  ISO.  If the Optionee holds ISO Shares for at
least one year after exercise and two years after the grant date, any gain
realized on disposition of the Shares will be treated as long-term capital gain
for federal income tax purposes.  If the Optionee disposes of ISO Shares
within one year after exercise or two years after the grant date, any gain
realized on such disposition will be treated as compensation income (taxable
at ordinary income rates) to the extent of the excess, if any, of the lesser of
(A) the difference between the fair market value of the Shares acquired on the
date of exercise and the aggregate Exercise Price, or (B) the difference
between the sale price of such Shares and the aggregate Exercise Price.

          (c)  Notice of Disqualifying Disposition of ISO Shares.  If
the Optionee sells or otherwise disposes of any of the Shares acquired pursuant
to an ISO on or before the later of (i) two years after the grant date, or
(ii) one year after the exercise date, the Optionee shall immediately notify the
Company in writing of such disposition.  The Optionee agrees that he or she
may
be subject to income tax withholding by the Company on the compensation
income recognized from such early disposition of ISO Shares by payment in
cash or out of the current earnings paid to the Optionee.

<PAGE>
                                                                    FORM

                              EXHIBIT A

                    NOTICE OF STOCK OPTION GRANT

[Optionee's Name and Address]

     You have been granted an option to purchase Common Stock of
Supertex, Inc. (the "Company") under the 1991 Stock Option Plan (the "Plan")
as follows:

     Grant Number

     Date of Grant

     Vesting Commencement Date

     Exercise Price per Share                $

     Total Number of Shares Granted

     Total Exercise Price                    $

     Type of Option:            [Incentive Stock Option]
                                [Nonstatutory Stock Option]

     Expiration Date:                        _______________________


     Vesting Schedule:

     This Option may be exercised, in whole or in part, in accordance with
the following schedule:

                          Shares on

                          Shares on

                          Shares on

                          Shares on

                          Shares on

     Termination Period:

     This Option may be exercised for thirty (30) days after termination of
employment or consulting relationship, or such longer period as may be
applicable upon death or Disability of Optionee as provided in the Plan, but in
no event later than the Term/Expiration Date as provided above.

     Disqualifying Disposition:

     If the Optionee sells or otherwise disposes of any of the Shares
acquired pursuant to an ISO on or before the later of (i) two years after the
grant date, or (ii) one year after the exercise date, the Optionee shall
immediately notify the Company in writing of such disposition.  The Optionee
agrees that he or she may be subject to income tax withholding by the
Company on the compensation income recognized from such early disposition
of ISO Shares by payment in cash or out of the current earnings paid to the
Optionee.

     By your signature and the signature of the Company's representative
below, you and the Company agree that this Option is granted under and
governed by the terms and conditions of the Plan and this Option Agreement.
Optionee has reviewed the Plan and this Option Agreement in their entirety,
has had an opportunity to obtain the advice of counsel prior to executing this
Option Agreement and fully understands all provisions of the Plan and Option
Agreement.  Optionee hereby agrees to accept as binding, conclusive and final
all decisions or interpretations of the Administrator upon any questions
relating to the Plan and Option Agreement.

OPTIONEE:                          SUPERTEX, INC.


_____________________________     By:_______________________________
Signature

_____________________________     Title:_____________________________
Print Name


                          CONSENT OF SPOUSE

     The undersigned spouse of Optionee has read and hereby approves the
terms and conditions of the Plan and this Option Agreement.  In consideration
of the Company's granting his or her spouse the right to purchase Shares as set
forth in the Plan and this Option Agreement, the undersigned hereby agrees to
be irrevocably bound by the terms and conditions of the Plan and this Option
Agreement and further agrees that any community property interest shall be
similarly bound.  The undersigned hereby appoints the undersigned's spouse as
attorney-in-fact for the undersigned with respect to any amendment or exercise
of rights under the Plan or this Option Agreement.



                                        __________________
                                        Spouse of Optionee

<PAGE>
                              EXHIBIT B

                           EXERCISE NOTICE


SUPERTEX, INC.
1235 Bordeaux Drive
Sunnyvale, CA 94089


Attention:  Secretary

     1.   Exercise of Option.  Effective as of today, ___________, 199_,
the undersigned ("Purchaser") hereby elects to purchase _________ shares
(the "Shares") of the Common Stock of Supertex, Inc. (the "Company") under
and pursuant to the 1991 Stock Option Plan (the "Plan") and the Stock Option
Agreement dated ___________ (the "Option Agreement").  The purchase
price for the Shares shall be $______________, as required by the Option
Agreement.

     2.   Delivery of Payment.  Purchaser herewith delivers to the Company
the full purchase price for the Shares.

     3.   Representations of Optionee.  Optionee acknowledges that
Optionee has received, read and understood the Plan and the Option
Agreement and agrees to abide by and be bound by their terms and conditions.

     4.   Rights as Shareholder.  Subject to the terms and conditions of
this Agreement, Optionee shall have all of the rights of a shareholder of the
Company with respect to the Shares from and after the date that Optionee
delivers full payment of the Exercise Price until such time as Optionee disposes
of the Shares.

     5.   Tax Consultation.  Optionee understands that Optionee may
suffer adverse tax consequences as a result of Optionee's purchase or
disposition of the Shares.  Optionee represents that Optionee has consulted
with any tax consultants Optionee deems advisable in connection with the
purchase or disposition of the Shares and that Optionee is not relying on the
Company for any tax advice.

     6.   Disqualifying Disposition.  If the Optionee sells or otherwise
disposes of any of the Shares acquired pursuant to an ISO on or before the
later of (i) two years after the grant date, or (ii) one year after the exercise
date, the Optionee shall immediately notify the Company in writing of such
disposition.  The Optionee agrees that he or she may be subject to income tax
withholding by the Company on the compensation income recognized from
such early disposition of ISO Shares by payment in cash or out of the current
earnings paid to the Optionee.

     7.   Entire Agreement; Governing Law.  The Plan and Option
Agreement are incorporated herein by reference.  This Agreement, the Plan
and the Option Agreement constitute the entire agreement of the parties and
supersede in their entirety all prior undertakings and agreements of the
Company and Optionee with respect to the subject matter hereof, and such
agreement is governed by California law except for that body of law pertaining
to conflict of laws.


Submitted by:                      Accepted by:

OPTIONEE:                          SUPERTEX, INC.



___________________________            By:__________________________
Signature

___________________________            Its:__________________________
Print Name


Address:                           Address:

___________________________        1235 Bordeaux Drive
                                   Sunnyvale, CA 94089
___________________________


                                                    EXHIBIT 5.1

                                                    September 21, 1999

SUPERTEX, INC.
1235 Bordeaux Drive
Sunnyvale, CA 94088-3607

       Re: Registration Statement on Form S-8

Ladies and Gentlemen:

       We have examined the Registration Statement on Form S-8 to be filed by
you with the Securities and Exchange Commission on or about September 21,
1999 (the "Registration Statement"), in connection with the registration under
the Securities Act of 1933, as amended, of 900,000 shares of your Common
Stock (the "Shares") reserved for issuance under the 1991 Stock Option Plan,
(the "Plan").  As your legal counsel, we have examined the proceedings taken
and proposed to be taken in connection with the issuance, sale and payment of
consideration for the Shares to be issued under the Plan.

       It is our opinion that, when issued and sold in the manner referred to in
the Plan and pursuant to the agreements which accompany the Plan, the Shares
will be legally and validly issued, fully paid and non-assessable.

       We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments thereto.

                                   Very truly yours,

                                   WILSON,SONSINI, GOODRICH & ROSATI
                                   ProfessionalCorporation

                                   By: Thomas C. DeFilipps
                                       Thomas C.DeFilipps

                                                            EXHIBIT 23.1

                 CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in this registration
statement on Form S-8 (File No. 33-43691) of our report dated April 23, 1999,
relating to the consolidated financial statements and financial statement
schedule of Supertex, Inc., which appears in Supertex, Inc.'s Annual Report
on Form 10-K for the year ended March 31, 1999.


                                             PricewaterhouseCoopers LLP



San Jose, California
September 29, 1999



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