<SEC-DOCUMENT>0001144204-18-021362-index.html : 20180419
<SEC-HEADER>0001144204-18-021362.hdr.sgml : 20180419
<ACCEPTANCE-DATETIME>20180419162514
ACCESSION NUMBER:		0001144204-18-021362
CONFORMED SUBMISSION TYPE:	DEFM14A
PUBLIC DOCUMENT COUNT:		7
FILED AS OF DATE:		20180419
DATE AS OF CHANGE:		20180419
EFFECTIVENESS DATE:		20180419

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MICROSEMI CORP
		CENTRAL INDEX KEY:			0000310568
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952110371
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1002

	FILING VALUES:
		FORM TYPE:		DEFM14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08866
		FILM NUMBER:		18764043

	BUSINESS ADDRESS:	
		STREET 1:		ONE ENTERPRISE
		CITY:			ALISO VIEJO
		STATE:			CA
		ZIP:			92656
		BUSINESS PHONE:		949-380-6100

	MAIL ADDRESS:	
		STREET 1:		ONE ENTERPRISE
		CITY:			ALISO VIEJO
		STATE:			CA
		ZIP:			92656

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MICROSEMICONDUCTOR CORP
		DATE OF NAME CHANGE:	19830323
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFM14A
<SEQUENCE>1
<FILENAME>tv490472-defm14a.htm
<DESCRIPTION>DEFINITIVE PROXY STATEMENT
<TEXT>
Document 1 - file: tv490472-defm14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>footer_qatalyst.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: footer_qatalyst.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>lg_dfking-astco.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: lg_dfking-astco.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>lg_microsemi.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: lg_microsemi.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>lg_qatalyst2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: lg_qatalyst2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>tv490472_pc-pg01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: tv490472_pc-pg01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>tv490472_pc-pg02.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: tv490472_pc-pg02.jpg

</DOCUMENT>
</SEC-DOCUMENT>