<SEC-DOCUMENT>0001571049-18-000219-index.html : 20180404
<SEC-HEADER>0001571049-18-000219.hdr.sgml : 20180404
<ACCEPTANCE-DATETIME>20180404171832
ACCESSION NUMBER:		0001571049-18-000219
CONFORMED SUBMISSION TYPE:	PREM14A
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20180404
FILED AS OF DATE:		20180404
DATE AS OF CHANGE:		20180404

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:		PREM14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-08866
		FILM NUMBER:		18738173

	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>PREM14A
<SEQUENCE>1
<FILENAME>tv489618-prem14a.htm
<DESCRIPTION>PRELIMINARY PROXY STATEMENT
<TEXT>
Document 1 - file: tv489618-prem14a.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>
</SEC-DOCUMENT>