Document:

Form of Non-Qualified Stock Option Letter Agreement

 EXHIBIT 4.5.2 
 ADVANCED POWER TECHNOLOGY, INC. 
 NON-QUALIFIED STOCK OPTION LETTER AGREEMENT 
 TO: <NAME> 
 The Plan Administrator of the
ADVANCED POWER TECHNOLOGY, INC. (the “Company”) 2005 Equity Incentive Plan (the “Plan”) is pleased to inform you that you have been selected to receive a grant of a stock option under the Plan. Subject to the terms and
conditions set forth below and in the Plan, you are hereby granted a stock option under the Plan for the purchase of <SHARES> shares of the Company’s Common Stock at an exercise price of <EXPRICE> per share. A copy of the Plan is
attached and incorporated into this Agreement by reference. 
 1. Term: The term of the option is ten years from the date of
this Agreement and therefore, to the extent not exercised, will automatically terminate on <TERMDATE>, unless sooner terminated. 
 2. Who May Exercise: During your lifetime, only you can exercise the option. The Plan also provides for exercise of the option by the personal representative of your estate or the beneficiary thereof following your death. You
may use the Notice of Exercise of Stock Option in the form attached to this Agreement when you exercise the option. 
 3. Payment for
Shares: The option may be exercised by the delivery of cash, personal check (unless the Plan Administrator decides at the time of exercise not to accept a personal check), bank certified or cashier’s check. At the sole discretion of the
Plan Administrator, all or part of the required payment may be in the form of a promissory note, according to the terms dictated by the Plan Administrator and the Plan. In addition, payment may be made by transferring shares of Company stock
(acquired by the exercise of this Option or previously owned by you) to the Company as payment of the exercise price. 
 4. Transfer of
Option: The option is not transferable except by will or by the applicable laws of descent and distribution. 

 5. Length of Service Criteria - Vesting: The vesting of options shall be in accordance with
the following table: 
  

			
	 Period of Time From
 Date of Grant
	  	 Portion of Total Options
 Which is Exercisable

	 12 months
	  	50%
		
	 24 months
	  	100%

 6. Taxation: The date of grant of this option is <GRANTDATE>. You should
obtain tax advice when exercising your option and before disposing of the shares. The Company makes no representations concerning the tax affect of this option or the subsequent exercise thereof. 
 YOUR PARTICULAR ATTENTION IS DIRECTED TO SECTION 8 OF THE PLAN WHICH DESCRIBES CERTAIN IMPORTANT CONDITIONS RELATING TO FEDERAL AND STATE SECURITIES LAWS
THAT MUST BE SATISFIED BEFORE THE OPTION CAN BE EXERCISED AND BEFORE THE COMPANY CAN ISSUE ANY SHARES TO YOU. 
 Please execute the
Acceptance and Acknowledgment set forth below on the enclosed copy of this Agreement and return it to the undersigned. 
  

			
	Very truly yours,
	Advanced Power Technology, Inc.
		
	By:	 	  

		
	Its	 	President and Chief Executive Officer

 ACCEPTANCE AND ACKNOWLEDGMENT 
 I, a resident of <STATE>,<COUNTRY>, accept the stock option described above and in the 1995 Stock Option Plan and acknowledge receipt of a
copy of this Agreement, including a copy of the Plan. I have reviewed the Plan and am aware of its terms. 
 Dated:
                     
  

	
	  

	 Optionee’s Signature

	
	  

	Printed Name

 By his or her signature below, the spouse of the Optionee, if such Optionee is legally
married as of the date of this Agreement, acknowledges that he or she has read this Agreement and the Plan and is familiar with the terms and provisions thereof, and agrees to be bound by all the terms and conditions of this Agreement and the Plan.

 Dated:                     

  

	
	  

	Spouse’s Signature
	
	  

	Printed Name

 By his or her signature below, the Optionee represents that he or she is not legally married
as of the date of this Agreement. 
 Dated:
                     
  

	
	  

	 Optionee’s SignatureForm of Option Assumption Agreement

 EXHIBIT 4.6 
  

	Dear,	«FirstName» «LastName»: 

   ADDRESS 
 On April 28, 2006 (the “Effective Date”) Microsemi Corporation (“Microsemi”) acquired
Advanced Power Technology, Inc. (“APT”) (the “Acquisition”) and on the Effective Date you held one or more outstanding options to purchase shares of APT Common Stock granted to you under APT’s 1995 Stock Option Plan or
APT’s 2005 Equity Incentive Plan (collectively, the “APT Stock Option Plans”). Pursuant to the Merger Agreement, on the Effective Date, Microsemi assumed all obligations of APT under your outstanding option (or options as
listed below). This Option Assumption Agreement (the “Agreement”) evidences the terms of Microsemi’s assumption of an option (or options) to purchase APT Common Stock granted to you under the APT Stock Option Plans (the “APT
Option”), and documented by a stock option agreement (or stock option agreements) and any amendment(s) entered into by and between you and APT (the “Option Agreement(s)”), including the necessary adjustments for assumption of the APT
Option(s) that are required by the Acquisition. 
 Terms used herein and not defined herein shall have the meaning set forth in the Agreement
and Plan of Merger dated November 2, 2005, by and among Microsemi, APT Acquisition Corp., a wholly owned subsidiary of Microsemi, and APT, as amended by the Amendment No. 1 to Agreement and Plan of Merger dated April 25, 2006 (the
“Merger Agreement”). 
 The table below summarizes your APT Option(s) immediately before the Acquisition and your Assumed APT
Options after the Acquisition: 
  

													
	 APT OPTION
	 	 ASSUMED APT OPTION

	 Grant Date
	 	 Option Plan
	 	 Option Type
	 	 Exercise Price
 per share
	 	 Options
 outstanding
	 	 No. of Shares of
 Microsemi Stock
	 	 Exercise Price
 per Share

	«GrantDate»	 	«OptionPlan»-	 	«Option Type »	 	$«APT Price»	 	«Options outstanding»	 	«Microsemi Shares»	 	$«Microsemi Price»

 The post-Acquisition adjustments are based on the Implied Exchange Ratio of 0.5082 (as determined
in accordance with the terms of the Merger Agreement, which is based on the Exchange Ratio and increased by an amount that accounts for the value of the Cash Component in terms of Microsemi Common Stock) and are intended to: (i) assure that the
total spread of your assumed APT Option(s) ( i.e. , the difference between the aggregate fair market value and the aggregate exercise price) does not exceed the total spread that existed immediately prior to the Acquisition; (ii) to
preserve, on a per share basis, the ratio of exercise price to fair market value that existed immediately prior to the Acquisition and (iii) to the extent applicable and allowable by law, to retain incentive stock option (“ISO”)
status under federal tax laws. The number of shares of Microsemi Common Stock subject to your assumed APT Option(s) was determined by multiplying the Implied Exchange Ratio by the number of shares remaining subject to your APT Option(s) on the
Closing Date and rounding the resulting product down to the next whole number of shares of Microsemi Common Stock. The exercise price per share of your assumed APT Option(s) was determined by dividing the exercise price per share of your APT
Option(s) by the Implied Exchange Ratio and rounding the resulting quotient up to the next whole cent. 
 All references in the Option
Agreement(s) and the APT Stock Option Plans relating to your status as an employee of APT will now be deemed to refer to your status as an employee of Microsemi or any present or future Microsemi subsidiary. 
 The expiration date of your assumed APT Option(s) remain the same as set forth in the Option Agreement(s), but the number of shares subject to each
vesting installment and the exercise price per share have been adjusted to reflect the effect of the Acquisition. All other provisions which govern either the exercise or the termination of your assumed APT Option(s) remain the same as set forth in
the Option Agreement(s), and the provisions of the Option Agreement(s) (except as expressly modified by this Agreement and the Acquisition) will govern and control your rights under this Agreement to purchase shares of Microsemi Common Stock. Upon
termination of your employment with Microsemi you will have the limited post-termination exercise period specified in your Option Agreement(s) for your assumed APT Option(s) to the extent vested and outstanding at the time of termination after which
time your assumed APT Option(s) will expire and NOT be exercisable for Microsemi Common Stock. 

 Nothing in this Agreement or the Option Agreement(s) interferes in any way with your right and
Microsemi’s right, which rights are expressly reserved, to terminate your employment at any time for any reason. Future options, if any, you may receive from Microsemi will be governed by the terms of the Microsemi stock option plan under which
such options are granted, and such terms may be different from the terms of your assumed APT Option(s), including, but not limited to, the time period in which you have to exercise vested options after your termination of employment. 
 Please sign and date this Option Assumption Agreement and, at your earliest opportunity, return it to Microsemi Corporation at the following address: 
 Microsemi Corp. – Power Products Group 
 Attn: Accounting Department, attention: Brent Balderston 
 Address 405 SW Columbia Street, Bend, Oregon 97702 
 Telephone: 541-382-8028 
 Fax: 541-389-1241 
 (SIGNATURE PAGE FOLLOWS) 

 SIGNATURE 
 Until your fully executed Acknowledgment (attached to this Agreement) is received by Microsemi Corporation’s Stock Administration Department your Microsemi account will not be activated. If you have any questions
regarding this Agreement or your assumed APT Option(s), please contact Dave Sonksen, Chief Financial Officer at (949) 221-7100, or Brent Balderston, Microsemi Corp. – Power Products Group, Controller at (541) 382-8028. 
  

			
	Microsemi Corporation
		
	By:	 	 /s/ James J. Peterson

	Name:	 	James J. Peterson
	Title:	 	President & Chief Executive Officer
	Address 2381 Morse Ave., Irvine, California 92614
	Telephone: 949-221-7100
	Fax: 949-756-2087
	Email: jpeterson@microsemi.com

 (ACKNOWLEDGMENT PAGE FOLLOWS) 

 ACKNOWLEDGMENT 
 The undersigned acknowledges receipt of the foregoing Option Assumption Agreement and understands and agrees that all rights and liabilities with respect to the assumed APT Option(s) listed on the table above are
hereby assumed by Microsemi and are as set forth in the Option Agreement(s) for such assumed APT Option(s), the APT Stock Option Plans and this Option Assumption Agreement and agree to the terms as set forth in such Stock Option Assumption
Agreement. 
  

	Dated:	                , 2006 

 OPTIONEE: 
  

			
	By:	 	  

	Name:	 	  

	Address	 	  

	Telephone:	 	  

	Fax:	 	  

	Email:

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