Document:

<PAGE>

                                                                   EXHIBIT 10.87

                                   AGREEMENT

                                by and between

                             MICROSEMI CORPORATION

                                      and

                             Mr. James J. Peterson
<PAGE>

                               TABLE OF CONTENTS

1.  Term..............................................................  1
2.  Terminations by Executive.........................................  1
    a. Termination by Executive for "Good Reason......................  1
    b. Change of Control..............................................  2
    c. Voluntary Termination by Executive.............................  2
3.  Executive's Benefits Following Termination........................  3
    a. Executive's Benefits in Termination by Executive without
       "Good Reason" following Change in Control......................  3
       (i)    Salary..................................................  3
       (ii)   Incentive Compensation..................................  3
       (iii)  Car Allowance...........................................  3
       (iv)   Stock Options...........................................  3
       (v)    Medical Insurance.......................................  3
       (vi)   Retirement Plans; Unvested Company Contribution.........  4
       (vii)  Vacation and Sick Leave.................................  4
       (viii) General.................................................  4
    b. Executive's Benefits in Termination by Executive for
       "Good Reason" or by Company following Change in Control........  4
       (i)    Salary..................................................  4
       (ii)   Incentive Compensation..................................  5
       (iii)  Car Allowance...........................................  5
       (iv)   Stock Options...........................................  5
       (v)    Medical and Life Insurance..............................  5
       (vi)   Retirement Plans; Unvested Company Contribution.........  5
       (vii)  Vacation and Sick Leave.................................  6
       (viii) General.................................................  6
4.  Other Benefits Following Termination..............................  6
5.  Excise Taxes......................................................  7
6.  Indemnification...................................................  7
7.  Obligatory Restrictions on Executive..............................  7
    a. Non-Competition................................................  8
    b. No Solicitation of Employees...................................  8
    c. Consideration..................................................  8
8.  Termination of Certain Benefits Following New Employment..........  9
9.  No Mitigation by Executive Required...............................  9
10. Binding Agreement.................................................  9
11. No Attachment..................................................... 10
12. Assignment and Other Rights....................................... 10
13. Waiver............................................................ 10
14. Notice............................................................ 10
15. Governing Law..................................................... 11
<PAGE>

16. Costs............................................................. 11
17. Severability...................................................... 11
18. Arbitration....................................................... 11
19. Entire Agreement.................................................. 12
20. Withholding....................................................... 12
21. Separate Counsel.................................................. 13

                                      ii
<PAGE>

                                   AGREEMENT

     THIS AGREEMENT dated as of January 12, 2001 is made by and between
James J. Peterson ("Executive") and MICROSEMI CORPORATION, a Delaware
corporation ("Company")

     NOW, THEREFORE, for good and valuable considerations, receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

     1.   Term.  The term of this Agreement shall commence on the date hereof.
     --   ----
The term of this Agreement shall be renewed automatically on a daily basis so
that the outstanding term is always two (2) years after the date on which notice
of non-renewal or termination of this Agreement is given by the Executive to the
Company or by the Company to the Executive.  This Agreement relates to
Executive's employment with the Company, or any subsidiary, successor, assign or
affiliate of the Company, under any written or oral agreement.  For purposes of
the following provisions "Date of Termination" means the effective date of
termination of Executive's employment with any of the entities described above,
after notice and lapse of the notice period as required herein.

     2.   Terminations by Executive.
     --   -------------------------

               a.     Termination by Executive for "Good Reason." Following a
               --     -----------------------------------------
Change in Control, Executive may terminate his active employment under his oral
or written employment agreement with the Company upon five (5) days' written
notice to the Company given within ninety (90) days following the date on which
the Executive becomes aware of any of the following events, each of which shall
be deemed to be good reason for termination by Executive:

               (i)    any reduction in, or limitation upon, the compensation,
               ---
reimbursable expenses or other benefits provided in this Agreement, other than
(A) as generally effected by valid public law or regulation or (B) as results
from change in the amount of the incentive compensation pool if not resulting
from changes in the incentive pool formula or allocations and not resulting from
accounting or operational effects of the acquisition;

               (ii)   any change in assignment of Executive's primary duties to
               ----
a work location more than 50 miles from the Company's principal executive office
at 2830 South Fairview Street, Santa Ana, California 92704, without Executive's
prior written consent;

               (iii)  any failure by the Company to obtain the assumption of
               -----
this Agreement by any successor or assign of the Company;
<PAGE>

               (iv)   any material breach by the Company of any provision of
               ----
this Agreement; or

               (v)    any action taken by the Board or a standing Committee of
               ---
the Board in connection with, or the formation of a special Committee of the
Board for the purpose of, effecting any of the events listed in subparagraphs
(i) through (iv) immediately above;

          b.   Change of Control.   For purposes of this Agreement, "Change in
          --   -----------------
Control" means the occurrence of any of the following events:

               (i)    Any "person" (as such term is used in Sections 13(d) and
               ---
14(d) of the Securities Exchange Act of 1934, as amended) is or becomes the
"beneficial owner" (as defined in Rule 13d-3 under said Act), directly or
indirectly, of securities of the Company representing more than fifty percent
(50%) of the total voting power represented by the Company's then outstanding
voting securities;

               (ii)   Consummation of a merger or consolidation of the Company
               ----
with any other corporation, other than a merger or consolidation which would
result in the voting securities of the Company outstanding immediately prior
thereto continuing to represent (either by remaining outstanding or by being
converted into voting securities of the surviving entity) at least fifty-one
percent (51%) of the total voting power represented by the voting securities of
the Company or such surviving entity outstanding immediately after such merger
or consolidation, or the stockholders of the Company approving a plan of
complete liquidation of the Company or a consummation of the sale or disposition
by the Company of all or substantially all of the Company's assets.

          c.   Voluntary Termination by Executive.  After a Change in Control,
          --   ----------------------------------
without reason or for any reason other than one set forth in Section 2.a above,
Executive may voluntarily terminate his employment with the Company under any
                          ---------
oral or written employment agreement upon a minimum of one (1) month's written
notice to the Company.

     3.   Executive's Benefits Following Termination.
     --   ------------------------------------------

          a.   Executive's Benefits in Termination by Executive without "Good
          --   --------------------------------------------------------------
Reason" following Change in Control.  If Executive terminates his active
-----------------------------------
employment under his oral or

                                       2
<PAGE>

written employment agreement with the Company following a Change in Control
without "Good Reason":

               (i)    Salary. Executive or his estate shall be entitled to
               ---
receive 100% of his latest base salary for a period of n months following the
Date of Termination (where n is equal to the sum of three (3) months plus a
number of months equal to the number of years elapsed from the Hire Date to the
date notice of termination is given; provided, however that n shall be at least
12 and not more than 18).

               (ii)   Incentive Compensation. Executive or his estate will be
               ----
entitled to receive a prorated portion of the incentive compensation for the
partial year ending on the Date of Termination.

               (iii)  Car Allowance.  The car allowance shall continue until the
               -----
expiration of n months after the Date of Termination (where n is equal to the
sum of three (3) months plus a number of months equal to the number of years
elapsed from the Hire Date to the date the Company gives notice of termination;
provided, however that n shall be at least 12 and not more than 18), subject to
termination as described in Section 7.

               (iv)   Stock Options. The restricted stock granted by the Company
               ----
to Executive under all plans and all stock options and general stock
appreciation rights granted by the Company to Executive will remain in
existence, and continue to vest and remain exercisable for a period ending n
months after the Date of Termination (where n is equal to the sum of three (3)
months plus a number of months equal to the number of years elapsed from the
Hire Date to the date the Company gives notice of termination; provided, however
that n shall be at least 12 and not more than 18), subject in either case to the
latest expiration date specified in the restricted stock or option agreements.

               (v)    Medical and Life Insurance. Payment of premiums for
               ---
medical, dental and vision insurance and life insurance by the Company shall
continue on and subject to the terms of this Agreement for a period ending n
months after the Date of Termination (where n is equal to the sum of three (3)
months plus a number of months equal to the number of years elapsed from the
Hire Date to the date the Company gives notice of termination; provided, however
that n shall be at least 12 and not more than 18), subject to termination under
Section 7.

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               (vi)   Retirement Plans; Unvested Company Contribution. The
               ----                              -------
Executive shall be entitled to receive, not later than the fifteenth (15th) day
                   --------
following the Date of Termination, all benefits payable to him upon or on
account of termination under any of the Company's tax-qualified employee benefit
plans and any other plan, program or arrangement relating to deferred
compensation, retirement or other benefits including, without limitation, any
profit sharing, 401(k), employee stock ownership plan, or any plan established
as a supplement to any of the aforementioned plans. The Company shall not be
required to pay Executive any amount of unvested Company contributions credited
to the Executive's account under any tax-qualified employee benefit plan
maintained by the Company as of the Date of Termination. In the event that this
paragraph should conflict with the provisions of any of the Company's tax-
qualified employee benefit plans and any other plan, program or arrangement
relating to deferred compensation, retirement or other benefits including,
without limitation, any profit sharing, 401(k), employee stock ownership plan,
or any plan established as a supplement to any of the aforementioned plans, then
the provisions of the plan shall govern.

               (vii)  Vacation and Sick Leave. The Company shall also pay
               -----               ----
Executive, not later than the second day following the Date of Termination, a
pro rata amount of his base salary under his employment agreement, in effect on
the Date of Termination, for each day of vacation leave which has accrued as of
                             ----
the Date of Termination, but which is unpaid as of such date, to which Executive
is entitled under the Company's vacation leave policy. The Company shall be
required to pay for sick leave days only to the extent that Executive has taken
sick leave on or prior to the Date of Termination to which Executive is entitled
under the Company's sick leave policy.

               (viii) General. Executive or his estate shall also be entitled
               ------ -------  ---------
to any other amounts then owing or accrued but unpaid to the Executive pursuant
                                           ---
to any plans or arrangements of the Company.

          b.   Executive's Benefits in Termination by Executive for "Good
          --   ----------------------------------------------------------
Reason" or by Company following Change in Control. If Executive terminates his
-------------------------------------------------
active employment under his oral or written employment agreement with the
Company for "Good Reason" following a Change in Control or the Company
terminates his active employment under his oral or written employment agreement
with the Company following a Change in Control:

                                       4
<PAGE>

               (i)    Salary. Executive or his estate shall be entitled to
               ---
payment, to be received not later than the fifteenth (15th) day following the
Date of Termination, of an amount equal to two (2) times his base salary as of
the Date of Termination.

               (ii)   Incentive Compensation. Executive or his estate will be
               ----
entitled to receive, not later than the fifteenth (15th) day following the Date
of Termination, an incentive compensation payment of two (2) times the highest
annual incentive compensation amount paid during any of the preceding three (3)
full plan years.

               (iii)  Car Allowance. The car allowance shall continue for a
               -----
period of two (2) years following the Date of Termination, subject to
termination as described in Section 7.

               (iv)   Stock Options. The restriction or forfeiture period on any
               ----
restricted stock granted by the Company to Executive under all plans and all
stock options and general stock appreciation rights granted by the Company to
Executive shall lapse or accelerate, as the case may be, and become fully vested
and exercisable on the Date of Termination, and shall remain exercisable for a
period of two (2) years following the Date of Termination, subject to the latest
expiration date specified in the restricted stock or option agreements.

               (v)    Medical and Life Insurance. Payment of premiums for
               ---
medical, dental and vision insurance and life insurance by the Company shall
continue on and subject to the terms of this Agreement for a period of two (2)
years following the Date of Termination, subject to termination under Section 7.

               (vi)   Retirement Plans; Unvested Company Contribution. The
               ----
Executive shall be entitled to receive, not later than the fifteenth (15th) day
                   --------
following the Date of Termination, all benefits payable to him upon or on
account of termination under any of the Company's tax-qualified employee benefit
plans and any other plan, program or arrangement relating to deferred
compensation, retirement or other benefits including, without limitation, any
profit sharing, 401(k), employee stock ownership plan, or any plan established
as a supplement to any of the aforementioned plans. The Company shall also pay
Executive, not later than the fifteenth (15th) day following the Date of
Termination, an amount equal to all unvested Company contributions credited to
the Executive's account under any tax-qualified employee benefit plan maintained
by the Company as of the Date of Termination. In the event that this paragraph
should conflict with the provisions of any of the Company's tax-qualified
employee benefit plans and any

                                       5
<PAGE>

other plan, program or arrangement relating to deferred compensation, retirement
or other benefits including, without limitation, any profit sharing, 401(k),
employee stock ownership plan, or any plan established as a supplement to any of
the aforementioned plans, then the provisions of the plan shall govern, provided
that the Company's contribution shall vest pursuant to this Section.

               (vii)  Vacation and Sick Leave. The Company shall also pay
               -----
Executive, not later than the second day following the Date of Termination, a
pro rata amount of his base salary under his employment agreement, in effect on
the Date of Termination, for each day of vacation leave which has accrued as of
                             ----
the Date of Termination, but which is unpaid as of such date, to which Executive
is entitled under the Company's vacation leave policy. The Company shall be
required to pay for sick leave days only to the extent that Executive has taken
sick leave on or prior to the Date of Termination to which Executive is entitled
under the Company's sick leave policy.

               (viii)  General. Executive or his estate shall also be entitled
               ------  -------  ---------
to any other amounts then owing or accrued but unpaid to the Executive pursuant
                                           ---
to any plans or arrangements of the Company.

     4.   Other Benefits Following Termination.  Executive shall also be
     --   ------------------------------------
entitled to the following additional benefits upon or following any such
termination following a Change in Control as described in Section 3:

          a.   During the period following employment or benefits hereunder, to
          --
the extent required by law, Executive shall have the rights under the
Consolidated Omnibus Budget Reconciliation Act ("COBRA"), or any successor
statute.

     5.   Excise Taxes.  If all or any portion of the amounts payable to
     --   ------------
Executive or on Executive's behalf under this Agreement or otherwise are subject
to the excise tax imposed by Section 4999 of the Internal Revenue Code of 1986,
as amended (or similar state tax and/or assessment), the Company shall pay to
Executive an amount necessary to place Executive in the same after-tax position
as Executive would have been had no such excise tax been imposed.  The amount
payable pursuant to the preceding sentence shall be grossed-up to the extent
necessary to pay income and excise taxes due on such amount.  The determination
of the amount of any such tax indemnity shall initially be made by the
independent accounting firm then employed by the Company.  If at a later date it
is determined (pursuant to final regulations or published rulings of the IRS,
final judgment of a court of competent jurisdiction or otherwise) that the
amount of excise taxes

                                       6
<PAGE>

payable by Executive is greater than the amount initially so determined, then
the Company (or its successor) shall pay Executive an amount equal to the sum of
(1) such additional excise taxes, (2) any interest, fines and penalties
resulting from such underpayment, plus (3) a gross-up amount necessary to
reimburse Executive for any income, excise or other taxes payable by Executive
with respect to the amounts specified in (1) and (2) above, and the
reimbursement provided by this clause (3).

     6.   Indemnification.  For at least ten (10) years following the Date of
     --   ---------------
Termination for any reason, Executive shall continue to be indemnified under the
Company's Certificate of Incorporation and Bylaws at least to the same extent
indemnification was available prior to the Date of Termination and permitted by
law, and Executive shall be insured under the directors' and officers' liability
insurance, the fiduciary liability insurance and the professional liability
insurance policies that are the same as, or provide coverage at least equivalent
to, those applicable or made available by the Company to the then members of
senior management of the Company.  Independent of such provision, if at any time
Executive is made, or threatened to be made, a party to any legal action or
proceeding, whether civil or criminal, by reason of the fact that Executive is
or was a director or officer of the Company or serves or served any other
corporation fifty percent (50%) or more owned or controlled by the Company in
any capacity at the Company's request, Executive shall be indemnified by the
Company, and the Company shall pay Executive's related expenses when and as
incurred, all to the full extent permitted by law.

     7.   Obligatory Restrictions on Executive.  Executive agrees that during
     --   ------------------------------------
the period of the commencing on the Date of Termination and extending n months
(where n is equal to the sum of three (3) months plus a number of months equal
to the number of years elapsed from the Hire Date to the date notice of
termination is given; provided, however that n shall be at least 12 and not more
than 18), except as provided below or with the Company's written consent, he
will be bound by the following restrictive covenants:

          a.   Non-Competition.  Following any involuntary termination following
          --   ---------------
a Change in Control or a termination by Executive for Good Reason following a
Change in Control, the restrictions in this paragraph, and any similar
restrictions under any employment agreement between the Company and Executive or
otherwise shall be of no force or effect.  In the event of a voluntary
termination (other than for Good Reason) by Executive following a Change in
Control, Executive will not, directly or indirectly, engage for his own account
in, or own, manage, operate,

                                       7
<PAGE>

control, be employed as an employee or consultant, buy, participate in, or be
connected in any manner with the ownership, management, operation or control of
any firm, corporation, association, or other business entity which is in
competition with the business of the Company; provided that Executive may invest
in a business competitive with the Company to an extent not exceeding five
percent (5%) of the total outstanding shares at the time of such investment in
each one or more companies. A business will be considered for this purpose in
competition with the Company if and only if the products of such business
include more than one-third of the Company's products as of immediately prior to
the Change in Control. In the event of a breach or threatened breach by
Executive of the provisions of this paragraph, the Company shall be entitled to
an injunction restraining Executive from violating the provisions of this
paragraph.

          b.   No Solicitation of Employees. Executive will not solicit or, with
          --   ----------------------------
the exception of any persons related to Executive by blood, marriage, or
adoption, not more remote than first cousin, employ any current or future
employee of the Company and will not intentionally disparage the Company, its
management or its products.

          c.   Consideration. Executive's obligations are made partly in
          --   -------------
consideration of the salary and other benefits paid or committed to be paid by
the Company following the Date of Termination.  The restrictive covenants on the
part of Executive set forth in this Section 20 shall survive the termination of
this Agreement, and the existence of any claims or cause of action by Executive
against the Company, whether predicated on this Agreement or otherwise, shall
not constitute a defense in the enforcement of these covenants.

     8.   Termination of Certain Benefits Following New Employment. If Executive
     --   --------------------------------------------------------
accepts a substantial engagement or employment ("New Employment") with any other
corporation, partnership, trust, government or other entity at any time during
the term of benefit continuation referred to above, the Company may elect that
Executive cease to be entitled to car allowance or medical, dental or vision
insurance benefits effective upon the commencement of such other engagement or
employment. However, Executive shall nevertheless continue to be entitled to the
other benefits of this Agreement and shall continue to be bound by the
provisions of this Agreement for any remaining duration of any period then
applicable to Executive. For the purposes of this provision, "employment" or
"engagement" shall exclude (i) service as an officer or director of a personal
investment holding company, (ii) service as a director on the Board of a
corporation or nonprofit organization, (iii) engagement as a bona fide part-time
consultant, or (iv) self-employment

                                       8
<PAGE>

or engagement as an officer or director of an operating corporation or
enterprise (as opposed to a personal investment holding company) founded or
controlled by Executive and which has (and only so long as it continues to have)
revenues of less than $25 million per year.

     9.   No Mitigation by Executive Required.  Company recognizes that because
     --   -----------------------------------
of Executive's special talents, stature and opportunities in the electronics
industry, in the event of termination by the Company or Executive before the end
of the agreed term, the parties acknowledge and agree that the provisions of
this Agreement regarding further payment of base salary, bonuses, and the
exercisability of stock options and lapse of the restrictive or forfeiture
period on restricted stock constitute fair and reasonable provisions for the
consequences of such termination, do not constitute a penalty, and such payments
and benefits shall not be limited or reduced by amounts Executive might earn or
be able to earn from any other employment or ventures during the remainder of
the agreed term of this Agreement.  Executive shall not be required to mitigate
the amount of any payment provided for in this Agreement by seeking other
employment or otherwise.

     10.  Binding Agreement.  This Agreement shall be binding upon and inure
     ---  -----------------
to the benefit of Executive, his heirs, distributees and assigns, and the
Company, its successors and assigns.  Executive may not, without the express
written permission of the Company, assign or pledge any rights or obligations
hereunder to any person, firm or corporation.  Such permission shall not be
unreasonably withheld.  If the Executive should die while any amount would still
be payable to Executive if he had continued to live, all such amounts, unless
otherwise provided herein, shall be paid in accordance with this Agreement to
the Executive's estate.

     11.  No Attachment.  Except as required by law, no right to receive
     ---  -------------
payments under this Agreement shall be subject to anticipation, commutation,
alienation, sale, assignment, encumbrance, charge, pledge or hypothecation or to
execution, attachment, levy or similar process or assignment by operation of
law, and any attempt, voluntary or involuntary, to effect any such action shall
be null, void and of no effect.

     12.  Assignment and Other Rights.  The Company will require any successor
     ---  ---------------------------
(whether direct or indirect, by operation of law, by purchase, merger,
consolidation or otherwise to all or substantially all of the business and/or
assets of the Company) to expressly assume and agree to perform this Agreement
in the same manner and to the same extent that the Company would be required to
perform it if no such succession had taken place.  Failure of the Company to
obtain such

                                       9
<PAGE>

assumption and agreement prior to the effectiveness of any such succession shall
be a breach of this Agreement and shall entitle Executive to compensation from
the Company in the same amount and on the same terms as the Executive would be
entitled hereunder, except that for purposes of implementing the foregoing, the
date on which any such succession becomes effective shall be the Date of
Termination. As used in this Agreement, "Company" shall mean the Company as
defined above and any successor to its business and/or assets that assumes and
agrees to perform this Agreement by operation of law, or otherwise.

     13.  Waiver.  No term or condition of this Agreement shall be deemed to
     ---  ------
have been waived, nor shall there be any estoppel against the enforcement of any
provision of this Agreement, except by written instrument of the party charged
with such waiver or estoppel.  No such written waiver shall be deemed a
continuing waiver unless specifically stated therein, and each such waiver shall
operate only as to the specific term or condition waived and shall not
constitute a waiver of such term or condition for the future or as to any act
other than that specifically waived.

     14.  Notice.  For the purposes of this Agreement, notices and all other
     ---  ------
communications provided for in this Agreement shall be in writing and shall be
deemed to have been duly given when delivered or mailed by United States
registered mail, return receipt requested, postage prepaid, addressed to the
Executive at his home address appearing in the records of the Company, in the
case of the Executive, and in the case of the Company, to the attention of the
Chairman of the Board at the principal executive offices of the Company, or to
such other address as either party may have furnished to the other in writing in
accordance herewith, except that notice of change of address shall be effective
only upon receipt.  Acceptance by Executive of benefits of participation shall
constitute a certification by Executive of his continued eligibility for
participation.

     15.  Governing Law.  This Agreement shall be governed and construed in
     ---  -------------
accordance with the laws of the State of California.

     16.  Costs.  Each of the parties shall pay its own expenses, including
     ---  -----
attorneys' fees, in the negotiation and preparation of this Agreement.

     17.  Severability.  If, for any reason, any provision of this Agreement is
     ---  ------------
held invalid, such invalidity shall not affect any other provision of this
Agreement not held so invalid, and each such other provision shall to the full
extent consistent with law continue in full force and effect.  If any provision
of this Agreement shall be held invalid in part, such invalidity shall in no way
affect the

                                       10
<PAGE>

rest of such provision not held so invalid, and the rest of such provision,
together with all other provisions of this Agreement, shall to the full extent
consistent with law continue in full force and effect. If this Agreement is held
invalid or cannot be enforced, then to the full extent permitted by law, any
prior agreement between the Company (or any predecessor thereof) and Executive
shall be deemed reinstated as if this Agreement has not been executed.

     18.  Arbitration.
     ---  -----------

          a.   Any disagreement, dispute, controversy or claim arising out of or
          --
in any way related to this Agreement or the subject matter thereof or the
interpretation hereof or any arrangements relating hereto or contemplated herein
or the breach, termination or invalidity hereof shall be settled exclusively and
finally by arbitration.

          b.   The arbitration shall be conducted in accordance with the
          --
Commercial Arbitration Rules (the "Arbitration Rules") of the American
Arbitration Association (the "AAA").  The arbitral tribunal shall consist of one
arbitrator.

          c.   The Company shall pay all of the fees, if any, and expenses of
          --
such arbitration, and shall also pay all Executive's expenses, including
attorneys' fees, incurred in connection with the arbitration regardless of the
final outcome of such arbitration.

          d.   The arbitration shall be conducted in Orange County, California,
          --
or in any other city or county in the United States of America as the parties to
the dispute may designate by mutual written consent.

          e.   Any decision or award of the tribunal shall be final and binding
          --
upon the parties to the arbitration proceeding.  The parties hereto hereby waive
to the extent permitted by law any rights to appeal or to review such award by
any court or tribunal.  The parties hereto agree that the award may be enforced
against the parties to the arbitration proceeding or their assets wherever the
award may be entered in any court having jurisdiction thereof.

          f.   The parties stipulate that discovery may be held in any such
          --
arbitration proceeding as provided in Section 1283.05 of the California Code of
Civil Procedure, as may be amended or revised from time to time.

                                       11
<PAGE>

          g.  During the period until the dispute is finally resolved in
          --
accordance with this Section, the Company will continue to pay the Executive his
full compensation in effect when the notice giving rise to the dispute was given
(including, but not limited to, base salary) and continue the Executive as a
participant in all compensation, employee benefit and insurance plans, programs,
arrangements and perquisites in which the Executive was participating or
entitled when the notice giving rise to the dispute was given, until the dispute
is finally resolved in accordance with this paragraph (c).  Amounts paid under
this paragraph (c) shall be repaid to the Company or be offset against or reduce
any other amounts due the Executive under this Agreement, as appropriate, only
upon the final resolution of the dispute.

     19.  Entire Agreement.  As of the date hereof, all previous agreements
     ---  ----------------
relating to the employment of Executive, however styled, are hereby superseded
to the extent inconsistent herewith, and, excepting Executive's present
participation in Company stock and/or other benefit plans or programs and the
agreements thereunder, which are hereby reaffirmed in all respects by both
parties thereto except as expressly modified by this Agreement, this Agreement
embodies all agreements, contracts, and understandings by and between the
parties hereto. In addition, this Agreement supersedes and amends any subsequent
employment agreement between Executive and the Company except to the extent such
subsequent agreement expressly provides or provides benefits in excess of those
herein provided. Should any other agreement, plan or arrangement between Company
and Executive or other officers or employees of the Company provide for greater
benefits upon a change in control, the terms of such other agreement, plan or
arrangement shall apply to Executive on a "most favored" basis. This Agreement
may not be changed orally, but only by an agreement in writing signed by the
party against whom enforcement of any waiver, change, modification, extension,
or discharge is sought.

     20.  Withholding.  All payments or benefits under this Agreement are
     ---  -----------
subject to, and the net payment to Executive will be reduced by, any applicable
payroll tax withholding requirements, and will be payable net of appropriate
amounts properly credited to the payment of income taxes of the Executive.  The
determination of the amount of any such withholding shall be made or confirmed
by the independent accounting firm then employed by the Company.

     21.  Separate Counsel.  The Company has been represented by Yocca Patch &
     ---  ----------------
Yocca, LLP in the negotiation and execution of this Agreement.  The Executive
has been invited and given

                                       12
<PAGE>

opportunity to engage counsel to review or negotiate this Agreement, and
Executive has either done so or chosen not to engage counsel.

     IN WITNESS WHEREOF, the parties have executed this Employment Agreement as
of the day and year first above written.

                                      COMPANY:
                                      MICROSEMI CORPORATION

                                      By: /S/  JAMES J. PETERSON
                                          ----------------------
                                          James J. Peterson
                                          President and CEO

                                      EXECUTIVE:

                                          /S/  JAMES J. PETERSON
                                          ----------------------
                                          James J. Peterson

                                       13<PAGE>

                                                                   EXHIBIT 10.88

                                   AGREEMENT

                                 by and between

                             MICROSEMI CORPORATION

                                      and

                              Mr. David R. Sonksen

<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<C>  <S>                                                                   <C>
<CAPTION>
1.   Term.................................................................  1
2.   Terminations by Executive............................................  1
     a.  Termination by Executive for "Good Reason........................  1
     b.  Change of Control................................................  2
     c.  Voluntary Termination by Executive...............................  2
3.   Executive's Benefits Following Termination...........................  3
     a.  Executive's Benefits in Termination by Executive without "Good
         Reason" following Change in Control..............................  3
         (i)      Salary..................................................  3
         (ii)     Incentive Compensation..................................  3
         (iii)    Car Allowance...........................................  3
         (iv)     Stock Options...........................................  3
         (v)      Medical Insurance.......................................  3
         (vi)     Retirement Plans; Unvested Company Contribution.........  4
         (vii)    Vacation and Sick Leave.................................  4
         (viii)   General.................................................  4
     b.  Executive's Benefits in Termination by Executive for "Good
         Reason" or by Company following Change in Control................  4
         (i)      Salary..................................................  4
         (ii)     Incentive Compensation..................................  5
         (iii)    Car Allowance...........................................  5
         (iv)     Stock Options...........................................  5
         (v)      Medical and Life Insurance..............................  5
         (vi)     Retirement Plans; Unvested Company Contribution.........  5
         (vii)    Vacation and Sick Leave.................................  6
         (viii)   General.................................................  6
4.   Other Benefits Following Termination.................................  6
5.   Excise Taxes.........................................................  7
6.   Indemnification......................................................  7
7.   Obligatory Restrictions on Executive.................................  7
     a.  Non-Competition..................................................  8
     b.  No Solicitation of Employees.....................................  8
     c.  Consideration....................................................  8
8.   Termination of Certain Benefits Following New Employment.............  9
9.   No Mitigation by Executive Required..................................  9
10.  Binding Agreement....................................................  9
11.  No Attachment........................................................ 10
12.  Assignment and Other Rights.......................................... 10
13.  Waiver............................................................... 10
14.  Notice............................................................... 10
15.  Governing Law........................................................ 11
</TABLE>
<PAGE>

<TABLE>
<C>  <S>                                                                   <C>
16.  Costs................................................................ 11
17.  Severability......................................................... 11
18.  Arbitration.......................................................... 11
19.  Entire Agreement..................................................... 12
20.  Withholding.......................................................... 12
21.  Separate Counsel..................................................... 13
</TABLE>

                                      ii
<PAGE>

                                   AGREEMENT

     THIS AGREEMENT dated as of January 12, 2001 is made by and between
David R. Sonksen ("Executive") and MICROSEMI CORPORATION, a Delaware
corporation ("Company")

     NOW, THEREFORE, for good and valuable considerations, receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

     1.  Term.  The term of this Agreement shall commence on the date hereof.
     --  ----
The term of this Agreement shall be renewed automatically on a daily basis so
that the outstanding term is always two (2) years after the date on which notice
of non-renewal or termination of this Agreement is given by the Executive to the
Company or by the Company to the Executive.  This Agreement relates to
Executive's employment with the Company, or any subsidiary, successor, assign or
affiliate of the Company, under any written or oral agreement.  For purposes of
the following provisions "Date of Termination" means the effective date of
termination of Executive's employment with any of the entities described above,
after notice and lapse of the notice period as required herein.

     2.  Terminations by Executive.
     --  -------------------------

          a.  Termination by Executive for "Good Reason."  Following a Change in
          --  -----------------------------------------
Control, Executive may terminate his active employment under his oral or written
employment agreement with the Company upon five (5) days' written notice to the
Company given within ninety (90) days following the date on which the Executive
becomes aware of any of the following events, each of which shall be deemed to
be good reason for termination by Executive:

          (i)   any reduction in, or limitation upon, the compensation,
          ---
reimbursable expenses or other benefits provided in this Agreement, other than
(A) as generally effected by valid public law or regulation or (B) as results
from change in the amount of the incentive compensation pool if not resulting
from changes in the incentive pool formula or allocations and not resulting from
accounting or operational effects of the acquisition;

          (ii)  any change in assignment of Executive's primary duties to a work
          ----
location more than 50 miles from the Company's principal executive office at
2830 South Fairview Street, Santa Ana, California  92704, without Executive's
prior written consent;

          (iii) any failure by the Company to obtain the assumption of this
          -----
Agreement by any successor or assign of the Company;

<PAGE>

               (iv)  any material breach by the Company of any provision of this
               ----
Agreement; or

               (v)   any action taken by the Board or a standing Committee of
               ---
the Board in connection with, or the formation of a special Committee of the
Board for the purpose of, effecting any of the events listed in subparagraphs
(i) through (iv) immediately above;

         b.  Change of Control.  For purposes of this Agreement, "Change in
         --  -----------------
Control" means the occurrence of any of the following events:

               (i)   Any "person" (as such term is used in Sections 13(d) and
               ---
14(d) of the Securities Exchange Act of 1934, as amended) is or becomes the
"beneficial owner" (as defined in Rule 13d-3 under said Act), directly or
indirectly, of securities of the Company representing more than fifty percent
(50%) of the total voting power represented by the Company's then outstanding
voting securities;

               (ii)  Consummation of a merger or consolidation of the Company
               ----
with any other corporation, other than a merger or consolidation which would
result in the voting securities of the Company outstanding immediately prior
thereto continuing to represent (either by remaining outstanding or by being
converted into voting securities of the surviving entity) at least fifty-one
percent (51%) of the total voting power represented by the voting securities of
the Company or such surviving entity outstanding immediately after such merger
or consolidation, or the stockholders of the Company approving a plan of
complete liquidation of the Company or a consummation of the sale or disposition
by the Company of all or substantially all of the Company's assets.

         c.  Voluntary Termination by Executive.  After a Change in Control,
         --  ----------------------------------
without reason or for any reason other than one set forth in Section 2.a above,
Executive may voluntarily terminate his employment with the Company under any
                          ---------
oral or written employment agreement upon a minimum of one (1) month's written
notice to the Company.

     3.  Executive's Benefits Following Termination.
     --  ------------------------------------------

         a.  Executive's Benefits in Termination by Executive without "Good
         --  --------------------------------------------------------------
Reason" following Change in Control.  If Executive terminates his active
-----------------------------------
employment under his oral or written employment agreement with the Company
following a Change in Control without "Good Reason":

                                       2
<PAGE>

          (i)    Salary.  Executive or his estate shall be entitled to receive
          ---
100% of his latest base salary for a period of n months following the Date of
Termination (where n is equal to the sum of three (3) months plus a number of
months equal to the number of years elapsed from the Hire Date to the date
notice of termination is given; provided, however that n shall be at least 12
and not more than 18).

          (ii)   Incentive Compensation.  Executive or his estate will be
          ----
entitled to receive a prorated portion of the incentive compensation for the
partial year ending on the Date of Termination.

          (iii)  Car Allowance.  The car allowance shall continue until the
          -----
expiration of n months after the Date of Termination (where n is equal to the
sum of three (3) months plus a number of months equal to the number of years
elapsed from the Hire Date to the date the Company gives notice of termination;
provided, however that n shall be at least 12 and not more than 18), subject to
termination as described in Section 7.

          (iv)  Stock Options.  The restricted stock granted by the Company to
          ----
Executive under all plans and all stock options and general stock appreciation
rights granted by the Company to Executive will remain in existence, and
continue to vest and remain exercisable for a period ending n months after the
Date of Termination (where n is equal to the sum of three (3) months plus a
number of months equal to the number of years elapsed from the Hire Date to the
date the Company gives notice of termination; provided, however that n shall be
at least 12 and not more than 18), subject in either case to the latest
expiration date specified in the restricted stock or option agreements.

          (v)   Medical and Life Insurance.  Payment of premiums for medical,
          ---
dental and vision insurance and life insurance by the Company shall continue on
and subject to the terms of this Agreement for a period ending n months after
the Date of Termination (where n is equal to the sum of three (3) months plus a
number of months equal to the number of years elapsed from the Hire Date to the
date the Company gives notice of termination; provided, however that n shall be
at least 12 and not more than 18), subject to termination under Section 7.

          (vi)  Retirement Plans; Unvested Company Contribution.  The Executive
          ----                             -------
shall be entitled to receive, not later than the fifteenth (15th) day following
         --------
the Date of Termination, all benefits payable to him upon or on account of
termination under any of the Company's tax-qualified employee benefit plans and
any other plan, program or arrangement

                                       3
<PAGE>

relating to deferred compensation, retirement or other benefits including,
without limitation, any profit sharing, 401(k), employee stock ownership plan,
or any plan established as a supplement to any of the aforementioned plans. The
Company shall not be required to pay Executive any amount of unvested Company
contributions credited to the Executive's account under any tax-qualified
employee benefit plan maintained by the Company as of the Date of Termination.
In the event that this paragraph should conflict with the provisions of any of
the Company's tax-qualified employee benefit plans and any other plan, program
or arrangement relating to deferred compensation, retirement or other benefits
including, without limitation, any profit sharing, 401(k), employee stock
ownership plan, or any plan established as a supplement to any of the
aforementioned plans, then the provisions of the plan shall govern.

          (vii)  Vacation and Sick Leave.  The Company shall also pay Executive,
          -----               ----
not later than the second day following the Date of Termination, a pro rata
amount of his base salary under his employment agreement, in effect on the Date
of Termination, for each day of vacation leave which has accrued as of the Date
                    ----
of Termination, but which is unpaid as of such date, to which Executive is
entitled under the Company's vacation leave policy.  The Company shall be
required to pay for sick leave days only to the extent that Executive has taken
sick leave on or prior to the Date of Termination to which Executive is entitled
under the Company's sick leave policy.

          (viii) General.  Executive or his estate shall also be entitled to
          ------ -------   ---------
any other amounts then owing or accrued but unpaid to the Executive pursuant to
                                        ---
any plans or arrangements of the Company.

      b.  Executive's Benefits in Termination by Executive for "Good Reason" or
      --  ---------------------------------------------------------------------
by Company following Change in Control.  If Executive terminates his active
--------------------------------------
employment under his oral or written employment agreement with the Company for
"Good Reason" following a Change in Control or the Company terminates his active
employment under his oral or written employment agreement with the Company
following a Change in Control:

          (i)  Salary.  Executive or his estate shall be entitled to payment, to
          ---
be received not later than the fifteenth (15th) day following the Date of
Termination, of an amount equal to two (2) times his base salary as of the Date
of Termination.

          (ii)  Incentive Compensation.  Executive or his estate will be
          ----
entitled to receive, not later than the fifteenth (15th) day following the Date
of Termination, an

                                       4
<PAGE>

incentive compensation payment of two (2) times the highest annual incentive
compensation amount paid during any of the preceding three (3) full plan years.

          (iii)  Car Allowance.  The car allowance shall continue for a period
          -----
of two (2) years following the Date of Termination, subject to termination as
described in Section 7.

          (iv)   Stock Options.  The restriction or forfeiture period on any
          ----
restricted stock granted by the Company to Executive under all plans and all
stock options and general stock appreciation rights granted by the Company to
Executive shall lapse or accelerate, as the case may be, and become fully vested
and exercisable on the Date of Termination, and shall remain exercisable for a
period of two (2) years following the Date of Termination, subject to the latest
expiration date specified in the restricted stock or option agreements.

          (v)    Medical and Life Insurance.  Payment of premiums for medical,
          ---
dental and vision insurance and life insurance by the Company shall continue on
and subject to the terms of this Agreement for a period of two (2) years
following the Date of Termination, subject to termination under Section 7.

          (vi)   Retirement Plans; Unvested Company Contribution.  The Executive
          ----
shall be entitled to receive, not later than the fifteenth (15th) day following
         --------
the Date of Termination, all benefits payable to him upon or on account of
termination under any of the Company's tax-qualified employee benefit plans and
any other plan, program or arrangement relating to deferred compensation,
retirement or other benefits including, without limitation, any profit sharing,
401(k), employee stock ownership plan, or any plan established as a supplement
to any of the aforementioned plans.  The Company shall also pay Executive, not
later than the fifteenth (15th) day following the Date of Termination, an amount
equal to all unvested Company contributions credited to the Executive's account
under any tax-qualified employee benefit plan maintained by the Company as of
the Date of Termination.  In the event that this paragraph should conflict with
the provisions of any of the Company's tax-qualified employee benefit plans and
any other plan, program or arrangement relating to deferred compensation,
retirement or other benefits including, without limitation, any profit sharing,
401(k), employee stock ownership plan, or any plan established as a supplement
to any of the aforementioned plans, then the provisions of the plan shall
govern, provided that the Company's contribution shall vest pursuant to this
Section.

          (vii)  Vacation and Sick Leave.  The Company shall also pay Executive,
          -----
not later than the second day following the Date of Termination, a pro rata
amount of his

                                       5
<PAGE>

base salary under his employment agreement, in effect on the Date of
Termination, for each day of vacation leave which has accrued as of the Date of
                 ----
Termination, but which is unpaid as of such date, to which Executive is entitled
under the Company's vacation leave policy. The Company shall be required to pay
for sick leave days only to the extent that Executive has taken sick leave on or
prior to the Date of Termination to which Executive is entitled under the
Company's sick leave policy.

          (viii)  General.  Executive or his estate shall also be entitled to
          ------  -------   ---------
any other amounts then owing or accrued but unpaid to the Executive pursuant to
                                        ---
any plans or arrangements of the Company.

     4.  Other Benefits Following Termination.  Executive shall also be entitled
     --  ------------------------------------
to the following additional benefits upon or following any such termination
following a Change in Control as described in Section 3:

          a.  During the period following employment or benefits hereunder, to
          --
the extent required by law, Executive shall have the rights under the
Consolidated Omnibus Budget Reconciliation Act ("COBRA"), or any successor
statute.

     5.  Excise Taxes.  If all or any portion of the amounts payable to
     --  ------------
Executive or on Executive's behalf under this Agreement or otherwise are subject
to the excise tax imposed by Section 4999 of the Internal Revenue Code of 1986,
as amended (or similar state tax and/or assessment), the Company shall pay to
Executive an amount necessary to place Executive in the same after-tax position
as Executive would have been had no such excise tax been imposed.  The amount
payable pursuant to the preceding sentence shall be grossed-up to the extent
necessary to pay income and excise taxes due on such amount.  The determination
of the amount of any such tax indemnity shall initially be made by the
independent accounting firm then employed by the Company.  If at a later date it
is determined (pursuant to final regulations or published rulings of the IRS,
final judgment of a court of competent jurisdiction or otherwise) that the
amount of excise taxes payable by Executive is greater than the amount initially
so determined, then the Company (or its successor) shall pay Executive an amount
equal to the sum of (1) such additional excise taxes, (2) any interest, fines
and penalties resulting from such underpayment, plus (3) a gross-up amount
necessary to reimburse Executive for any income, excise or other taxes payable
by Executive with respect to the amounts specified in (1) and (2) above, and the
reimbursement provided by this clause (3).

                                       6
<PAGE>

     6.  Indemnification.  For at least ten (10) years following the Date of
     --  ---------------
Termination for any reason, Executive shall continue to be indemnified under the
Company's Certificate of Incorporation and Bylaws at least to the same extent
indemnification was available prior to the Date of Termination and permitted by
law, and Executive shall be insured under the directors' and officers' liability
insurance, the fiduciary liability insurance and the professional liability
insurance policies that are the same as, or provide coverage at least equivalent
to, those applicable or made available by the Company to the then members of
senior management of the Company.  Independent of such provision, if at any time
Executive is made, or threatened to be made, a party to any legal action or
proceeding, whether civil or criminal, by reason of the fact that Executive is
or was a director or officer of the Company or serves or served any other
corporation fifty percent (50%) or more owned or controlled by the Company in
any capacity at the Company's request, Executive shall be indemnified by the
Company, and the Company shall pay Executive's related expenses when and as
incurred, all to the full extent permitted by law.

     7.  Obligatory Restrictions on Executive.  Executive agrees that during the
     --  ------------------------------------
period of the commencing on the Date of Termination and extending n months
(where n is equal to the sum of three (3) months plus a number of months equal
to the number of years elapsed from the Hire Date to the date notice of
termination is given; provided, however that n shall be at least 12 and not more
than 18), except as provided below or with the Company's written consent, he
will be bound by the following restrictive covenants:

          a.  Non-Competition.  Following any involuntary termination following
          --  ---------------
a Change in Control or a termination by Executive for Good Reason following a
Change in Control, the restrictions in this paragraph, and any similar
restrictions under any employment agreement between the Company and Executive or
otherwise shall be of no force or effect.  In the event of a voluntary
termination (other than for Good Reason) by Executive following a Change in
Control, Executive will not, directly or indirectly, engage for his own account
in, or own, manage, operate, control, be employed as an employee or consultant,
buy, participate in, or be connected in any manner with the ownership,
management, operation or control of any firm, corporation, association, or other
business entity which is in competition with the business of the Company;
provided that Executive may invest in a business competitive with the Company to
an extent not exceeding five percent (5%) of the total outstanding shares at the
time of such investment in each one or more companies.  A business will be
considered for this purpose in competition with the Company if and only if the
products of such business include more than one-third of the Company's products
as of immediately prior to the Change in Control.  In the event of a breach or
threatened breach by

                                       7
<PAGE>

Executive of the provisions of this paragraph, the Company shall be entitled to
an injunction restraining Executive from violating the provisions of this
paragraph.

          b.  No Solicitation of Employees.  Executive will not solicit or, with
          --  ----------------------------
the exception of any persons related to Executive by blood, marriage, or
adoption, not more remote than first cousin, employ any current or future
employee of the Company and will not intentionally disparage the Company, its
management or its products.

          c.  Consideration.  Executive's obligations are made partly in
          --  -------------
consideration of the salary and other benefits paid or committed to be paid by
the Company following the Date of Termination.  The restrictive covenants on the
part of Executive set forth in this Section 20 shall survive the termination of
this Agreement, and the existence of any claims or cause of action by Executive
against the Company, whether predicated on this Agreement or otherwise, shall
not constitute a defense in the enforcement of these covenants.

     8.  Termination of Certain Benefits Following New Employment.  If Executive
     --  --------------------------------------------------------
accepts a substantial engagement or employment ("New Employment") with any other
corporation, partnership, trust, government or other entity at any time during
the term of benefit continuation referred to above, the Company may elect that
Executive cease to be entitled to car allowance or medical, dental or vision
insurance benefits effective upon the commencement of such other engagement or
employment.  However, Executive shall nevertheless continue to be entitled to
the other benefits of this Agreement and shall continue to be bound by the
provisions of this Agreement for any remaining duration of any period then
applicable to Executive.  For the purposes of this provision, "employment" or
"engagement" shall exclude (i) service as an officer or director of a personal
investment holding company, (ii) service as a director on the Board of a
corporation or nonprofit organization, (iii) engagement as a bona fide part-time
consultant, or (iv) self-employment or engagement as an officer or director of
an operating corporation or enterprise (as opposed to a personal investment
holding company) founded or controlled by Executive and which has (and only so
long as it continues to have) revenues of less than $25 million per year.

     9.  No Mitigation by Executive Required.  Company recognizes that because
     --  -----------------------------------
of Executive's special talents, stature and opportunities in the electronics
industry, in the event of termination by the Company or Executive before the end
of the agreed term, the parties acknowledge and agree that the provisions of
this Agreement regarding further payment of base salary, bonuses, and the
exercisability of stock options and lapse of the restrictive or forfeiture
period on restricted stock constitute fair and reasonable provisions for the
consequences of such termination, do not

                                       8
<PAGE>

constitute a penalty, and such payments and benefits shall not be limited or
reduced by amounts Executive might earn or be able to earn from any other
employment or ventures during the remainder of the agreed term of this
Agreement. Executive shall not be required to mitigate the amount of any payment
provided for in this Agreement by seeking other employment or otherwise.

     10.  Binding Agreement.  This Agreement shall be binding upon and inure to
     ---  -----------------
the benefit of Executive, his heirs, distributees and assigns, and the Company,
its successors and assigns. Executive may not, without the express written
permission of the Company, assign or pledge any rights or obligations hereunder
to any person, firm or corporation. Such permission shall not be unreasonably
withheld. If the Executive should die while any amount would still be payable to
Executive if he had continued to live, all such amounts, unless otherwise
provided herein, shall be paid in accordance with this Agreement to the
Executive's estate.

     11.  No Attachment.  Except as required by law, no right to receive
     ---  -------------
payments under this Agreement shall be subject to anticipation, commutation,
alienation, sale, assignment, encumbrance, charge, pledge or hypothecation or to
execution, attachment, levy or similar process or assignment by operation of
law, and any attempt, voluntary or involuntary, to effect any such action shall
be null, void and of no effect.

     12.  Assignment and Other Rights.  The Company will require any successor
     ---  ---------------------------
(whether direct or indirect, by operation of law, by purchase, merger,
consolidation or otherwise to all or substantially all of the business and/or
assets of the Company) to expressly assume and agree to perform this Agreement
in the same manner and to the same extent that the Company would be required to
perform it if no such succession had taken place.  Failure of the Company to
obtain such assumption and agreement prior to the effectiveness of any such
succession shall be a breach of this Agreement and shall entitle Executive to
compensation from the Company in the same amount and on the same terms as the
Executive would be entitled hereunder, except that for purposes of implementing
the foregoing, the date on which any such succession becomes effective shall be
the Date of Termination.  As used in this Agreement, "Company" shall mean the
Company as defined above and any successor to its business and/or assets that
assumes and agrees to perform this Agreement by operation of law, or otherwise.

     13.  Waiver.  No term or condition of this Agreement shall be deemed to
     ---  ------
have been waived, nor shall there be any estoppel against the enforcement of any
provision of this Agreement, except by written instrument of the party charged
with such waiver or estoppel.  No such written waiver shall be deemed a
continuing waiver unless specifically stated therein, and each such waiver

                                       9
<PAGE>

shall operate only as to the specific term or condition waived and shall not
constitute a waiver of such term or condition for the future or as to any act
other than that specifically waived.

     14.  Notice.  For the purposes of this Agreement, notices and all other
     ---  ------
communications provided for in this Agreement shall be in writing and shall be
deemed to have been duly given when delivered or mailed by United States
registered mail, return receipt requested, postage prepaid, addressed to the
Executive at his home address appearing in the records of the Company, in the
case of the Executive, and in the case of the Company, to the attention of the
Chairman of the Board at the principal executive offices of the Company, or to
such other address as either party may have furnished to the other in writing in
accordance herewith, except that notice of change of address shall be effective
only upon receipt.  Acceptance by Executive of benefits of participation shall
constitute a certification by Executive of his continued eligibility for
participation.

     15.  Governing Law.  This Agreement shall be governed and construed in
     ---  -------------
accordance with the laws of the State of California.

     16.  Costs.  Each of the parties shall pay its own expenses, including
     ---  -----
attorneys' fees, in the negotiation and preparation of this Agreement.

     17.  Severability.  If, for any reason, any provision of this Agreement is
     ---  ------------
held invalid, such invalidity shall not affect any other provision of this
Agreement not held so invalid, and each such other provision shall to the full
extent consistent with law continue in full force and effect.  If any provision
of this Agreement shall be held invalid in part, such invalidity shall in no way
affect the rest of such provision not held so invalid, and the rest of such
provision, together with all other provisions of this Agreement, shall to the
full extent consistent with law continue in full force and effect.  If this
Agreement is held invalid or cannot be enforced, then to the full extent
permitted by law, any prior agreement between the Company (or any predecessor
thereof) and Executive shall be deemed reinstated as if this Agreement has not
been executed.

                                       10
<PAGE>

     18.  Arbitration.
     ---  -----------

          a.  Any disagreement, dispute, controversy or claim arising out of or
          --
in any way related to this Agreement or the subject matter thereof or the
interpretation hereof or any arrangements relating hereto or contemplated herein
or the breach, termination or invalidity hereof shall be settled exclusively and
finally by arbitration.

          b.  The arbitration shall be conducted in accordance with the
          --
Commercial Arbitration Rules (the "Arbitration Rules") of the American
Arbitration Association (the "AAA").  The arbitral tribunal shall consist of one
arbitrator.

          c.  The Company shall pay all of the fees, if any, and expenses of
          --
such arbitration, and shall also pay all Executive's expenses, including
attorneys' fees, incurred in connection with the arbitration regardless of the
final outcome of such arbitration.

          d.  The arbitration shall be conducted in Orange County, California,
          --
or in any other city or county in the United States of America as the parties to
the dispute may designate by mutual written consent.

          e.  Any decision or award of the tribunal shall be final and binding
          --
upon the parties to the arbitration proceeding.  The parties hereto hereby waive
to the extent permitted by law any rights to appeal or to review such award by
any court or tribunal.  The parties hereto agree that the award may be enforced
against the parties to the arbitration proceeding or their assets wherever the
award may be entered in any court having jurisdiction thereof.

          f.  The parties stipulate that discovery may be held in any such
          --
arbitration proceeding as provided in Section 1283.05 of the California Code of
Civil Procedure, as may be amended or revised from time to time.

          g.  During the period until the dispute is finally resolved in
          --
accordance with this Section, the Company will continue to pay the Executive his
full compensation in effect when the notice giving rise to the dispute was given
(including, but not limited to, base salary) and continue the Executive as a
participant in all compensation, employee benefit and insurance plans, programs,
arrangements and perquisites in which the Executive was participating or
entitled when the notice giving rise to the dispute was given, until the dispute
is finally resolved in accordance with this paragraph (c).  Amounts paid under
this paragraph (c) shall be repaid to the Company or be offset

                                       11
<PAGE>

against or reduce any other amounts due the Executive under this Agreement, as
appropriate, only upon the final resolution of the dispute.

     19.  Entire Agreement.  As of the date hereof, all previous agreements
     ---  ----------------
relating to the employment of Executive, however styled, are hereby superseded
to the extent inconsistent herewith, and, excepting Executive's present
participation in Company stock and/or other benefit plans or programs and the
agreements thereunder, which are hereby reaffirmed in all respects by both
parties thereto except as expressly modified by this Agreement, this Agreement
embodies all agreements, contracts, and understandings by and between the
parties hereto.  In addition, this Agreement supersedes and amends any
subsequent employment agreement between Executive and the Company except to the
extent such subsequent agreement expressly provides or provides benefits in
excess of those herein provided.  Should any other agreement, plan or
arrangement between Company and Executive or other officers or employees of the
Company provide for greater benefits upon a change in control, the terms of such
other agreement, plan or arrangement shall apply to Executive on a "most
favored" basis.  This Agreement may not be changed orally, but only by an
agreement in writing signed by the party against whom enforcement of any waiver,
change, modification, extension, or discharge is sought.

     20.  Withholding.   All payments or benefits under this Agreement are
          -----------
subject to, and the net payment to Executive will be reduced by, any applicable
payroll tax withholding requirements, and will be payable net of appropriate
amounts properly credited to the payment of income taxes of the Executive.  The
determination of the amount of any such withholding shall be made or confirmed
by the independent accounting firm then employed by the Company.

     21.  Separate Counsel.  The Company has been represented by Yocca Patch &
     ---  ----------------
Yocca, LLP in the negotiation and execution of this Agreement.  The Executive
has been invited and given opportunity to engage counsel to review or negotiate
this Agreement, and Executive has either done so or chosen not to engage
counsel.

     IN WITNESS WHEREOF, the parties have executed this Employment Agreement as
of the day and year first above written.

                              COMPANY:
                              MICROSEMI CORPORATION

                              By:   /S/  DAVID R. SONKSEN
                                    ---------------------
                                    David R. Sonksen
                                    Executive Vice President and CFO

                                       12
<PAGE>

                              EXECUTIVE:

                                    /S/  DAVID R. SONKSEN
                                    ---------------------
                                    David R. Sonksen

                                       13

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