Document:

Specimen certificate for shares of common stock

 EXHIBIT 4.1 
  
 [FRONT] 
  

					
	 	 	Incorporated Under the Laws of the State of Delaware	  	 
	 	 	Microsemi Corporation	  	 
	 	 	Common Stock	  	CUSIP 595137 10 0

  
 This Certifies that
                     is the owner of
                     fully paid and non-assessable shares of common stock of Microsemi Corporation, transfer of which will be registered on
the books of the Corporation maintained for that purpose upon presentation of this certificate, property endorsed. 
  
 This certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. 
  
 WITNESS the seal of the Corporation and the signatures of its duly authorized officers. 
  
 Dated: 
  

	
	
	

	 Secretary

  

	
	
	

	 President and Chief Executive Officer

 [BACK] 
  
 THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO REQUESTS, A STATEMENT OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING,
OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF COMMON STOCK OR SERIES THEREOF AND THE QUALIFICATIONS, LIMITATIONS OR RESTRICTIONS OF SUCH PREFERENCES AND/OR RIGHTS. 
  
 This certificate also evidences and entitles the holder hereof to certain Rights as set forth in the Rights Agreement between Microsemi
Corporation, a Delaware corporation (the “Company”) and Mellon Investor Services LLC (the “Rights Agent), dated as of December 22, 2000 (the “Rights Agreement”), the terms of which are hereby incorporated herein by
reference and a copy of which is on file at the principal offices of the Company. Under certain circumstances, as set forth in the Rights Agreement, such Rights will be evidenced by separate certificates and will no longer be evidenced by this
certificate. The Company will mail to the holder of this certificate a copy of the Rights Agreement, as in effect on the date of mailing, without charge promptly after receipt of a written request therefore. Under certain circumstances set forth in
the Rights Agreement, Rights issued to, or held by any Person who is, was or becomes an Acquiring Person or any Affiliate or Associates thereof (as such terms are defined in the Rights Agreement), whether currently held by or on behalf of such
Person or by any subsequent holder, may become null and void. 
  
 The following
abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations: 
  

					
	 TEN COM
	 	-	  	as tenants in common
	 TEN ENT
	 	-	  	as tenants by the entireties
	 JT TEN
	 	-	  	as join tenants with right of survivorship and not as tenants in common

  

							
	 UNIF GIFT MIN ACT-                                 
                             

	 	Custodian	 	  

	 	 	 (Cust)
	 	 	 	 (Minor)

	 	 	 Under: Uniform Gifts to Minors
	 	 

  

			
	Act.	 	  

	 	 	 (State)

  
 Additional abbreviations may also be
used though not in the above list. 
  
 For Value Received,
            , hereby sell, assign and transfer unto 
  
 Please insert social security or other identifying number of assignee
                     
  
 Name, Address, Zip Code of Assignee 
  
                      Shares of Common Stock represented by the
within Certificate, and do hereby irrevocably constitute and appoint                      Attorney to transfer the said stock on the books of
the within named Corporation with full power of substitution in the premises. 
  
 Dated                      
  

			
		
	 	 	  

	 	 	Notice: The signature to this agreement must correspond with the name as written upon the face of the certificate in every particular way, without alteration or enlargement or any
change whatever.
		
	 	 	 Signature(s) Guaranteed:

	 	 	The signature(s) should be guaranteed by an eligible guarantor institution (banks, stockbrokers, savings and loan associations and credit unions with membership in an approved signature
guarantee medallion program pursuant to S.E.C. Rule 17Ad-15.

  
 Keep this certificate in a safe place.
If it is lost, stolen, mutilated or destroyed, the corporation will require a bond of indemnity as a condition to the issuance of a replacement certificate.Amendment No. 1 to Rights Agreement

 EXHIBIT 4.2.1 
  
 AMENDMENT NO. ONE 
 TO RIGHTS AGREEMENT 
  
 THIS AMENDMENT NO. ONE TO RIGHTS
AGREEMENT dated as of December 16, 2005 (the “Amendment”) with respect to the Rights Agreement dated as of December 22, 2000 (herein, including all amendments, referred to as the “Agreement”) between Microsemi
Corporation, a Delaware corporation (the “Company”), and Mellon Investor Services, LLC, a New Jersey limited liability company (the “Rights Agent”). 
  
 W I T N E S S E T H 
  
 WHEREAS, the Board of Directors deems it appropriate under the Agreement and in the exercise of its authority under the Agreement to approve an amendment
of the Agreement prior to the Distribution Date; 
  
 NOW,
THEREFORE, FOR GOOD AND VALUABLE CONSIDERATIONS, the receipt and sufficiency of which are hereby acknowledged, the Agreement is hereby amended as follows: 
  
 1. Section 3(a), the third sentence is amended and restated in its entirety as follows: “In the event that an adjustment in the number of Rights
per share of Common Stock has been made pursuant to Section 11(p) hereof, at the time of distribution of the Rights Certificates, the Company shall make the necessary and appropriate adjustments, in accordance with Section 14(a) hereof,
such that all fractional shares are separately and independently valid, and after aggregating all fractional Rights to be received by such holder, each holder of fractional Rights shall receive from Parent an amount pursuant to Section 14(a)
hereof.” 
  
 2. Section 11(h), in the first sentence,
the reference to “(calculated to the nearest one-millionth)” is amended and restated as “(calculated to the nearest one ten-millionth of a share of Preferred Stock)”. 
  
 3. Section 11(h), in the first sentence, the reference to “price” is amended and restated as
“prior”, and in Section 11(p), in the first sentence, the reference to “price” is amended and restated as “prior”. 
  
 4. Section 11(i), in the third sentence, the reference to “(calculated to the nearest one-ten-thousandth)” is amended and restated as
“(calculated to the nearest one ten-thousandth of a Right)”. 
  
 5. Section 14(a), the first sentence is amended and restated in its entirety as follows: “The Company shall issue fractional Rights as contemplated in Section 11(p), and such fractions of Rights as are issued pursuant thereto
shall entitle the holder, in proportion to such holder’s fractional Rights, to exercise and to have all the benefits, powers and privileges of Rights under this agreement. Except as contemplated in Section 11(p), the Company shall not
issue fractional Rights. Except for fractional Rights issued as contemplated in Section 11(p), each holder of Rights who would otherwise be entitled to a fraction of a Right (after aggregating all fractional Rights to be received by such
holder) shall receive from Company an amount of 

  

 1 

 
cash without interest (rounded to the nearest whole cent) equal to the product of (i) such fraction, multiplied by (ii) the current market value of
a whole Right.” 
  
 6. Section 23(a), in the first
sentence, “10%” is amended and restated as “20%”. 
  
 7. Section 23(a), after the final sentence of the section, insert “The redemption of the Rights by the Board of Directors of the Company may be made effective at such time and on such date (the “Redemption Date”), on
such basis and with such conditions as the Board of Directors of the Company, in its sole discretion, may establish.” 
  
 8. Section 24(b), after the final sentence of the section, insert “Any failure to give, or any defect in, any notice of redemption shall not
affect the validity of such redemption.” 
  
 9.
Section 26 of the Agreement, the respective addresses for notice for the Company and the Rights Agent are amended and restated as follows: 
  
 MICROSEMI CORPORATION 
 2381 Morse Avenue 
 Irvine, California 92614 
 Attention: David R. Sonksen, Executive Vice President, Chief Financial Officer 
  
 MELLON INVESTOR SERVICES, LLC 
 400 South Hope Street 
 4th Floor 
 Los Angeles, CA 90071 
 Attention: Relationship Manager 
  
 With a copy to: 
 MELLON INVESTOR SERVICES, LLC 
 Newport Office Center VII 
 Jersey City, New Jersey 07310 
 Attention: General Counsel 
  
 10.
Section 26, after the last sentence in Section 26, insert “The Rights Agent or the Company may, from time to time, change its address pursuant to this Section 26 upon delivery of written notice to the other party, in accordance
with this Section 26.” 
  
 11. Exhibit A to the
Agreement is amended as set forth in the Certificate of Amendment of Certificate of Designation of Rights, Preferences and Privileges of Series A Junior Participating Preferred Stock of Microsemi Corporation, attached hereto. 
  
 12. Except as expressly provided in this Amendment, and except for the
additional terms and provisions set forth in this Amendment, the Agreement shall continue in full force and effect in accordance with its terms, and this Amendment shall be governed by such terms. This Amendment and the Agreement, as amended,
supersede any other agreement or understanding concerning the subject matter hereof. 
  
 13. Capitalized terms used herein and not defined herein shall have their defined meanings as set forth in the Agreement. 
  

 2 

 14. This Amendment may be executed in one or more counterparts, each of which shall be deemed an original
and all of which together shall constitute one instrument. 
  
 15.
The undersigned officers of the Company each hereby certifies, as indicated by each officer’s signature below, to the Rights Agent that the Amendment is in compliance with the terms of Section 27 of the Agreement. 
  
 IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. One to
Rights Agreement to be duly executed all as of the day and year first above written. 
  

			
	MICROSEMI CORPORATION
		
	 By:
	 	 /s/    James J. Peterson        

	 	 	 James J. Peterson,
 President and Chief Executive Officer

	
	 Attest:
  

[Seal]

		
	 By:
	 	 /s/    David R. Sonksen       

	 	 	 David R. Sonksen, Executive Vice President,
 Chief Financial Officer, Secretary and Treasurer

  
  

			
	MELLON INVESTOR SERVICES, LLC
		
	 By:
	 	

	 	 	 Name:
 Title:

		
	 By:
	 	

	 	 	 Name:
 Title:

  
  
  

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