<SEC-DOCUMENT>0001193125-18-180110-index.html : 20180531
<SEC-HEADER>0001193125-18-180110.hdr.sgml : 20180531
<ACCEPTANCE-DATETIME>20180531144902
ACCESSION NUMBER:		0001193125-18-180110
CONFORMED SUBMISSION TYPE:	SD
PUBLIC DOCUMENT COUNT:		2
<RULE>
<RULE-NAME>13p-1
<ITEM>
<ITEM-NUMBER>1.01
<ITEM-PERIOD>20171231
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<ITEM>
<ITEM-NUMBER>1.02
<ITEM-PERIOD>20171231
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FILED AS OF DATE:		20180531
DATE AS OF CHANGE:		20180531

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEMTECH CORP
		CENTRAL INDEX KEY:			0000088941
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952119684
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0129

	FILING VALUES:
		FORM TYPE:		SD
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-06395
		FILM NUMBER:		18871138

	BUSINESS ADDRESS:	
		STREET 1:		200 FLYNN ROAD
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012-8790
		BUSINESS PHONE:		8054982111

	MAIL ADDRESS:	
		STREET 1:		200 FLYNN ROAD
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012-8790
</SEC-HEADER>
<DOCUMENT>
<TYPE>SD
<SEQUENCE>1
<FILENAME>d592389dsd.htm
<DESCRIPTION>SD
<TEXT>
Document 1 - file: d592389dsd.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.01
<SEQUENCE>2
<FILENAME>d592389dex101.htm
<DESCRIPTION>EX-1.01
<TEXT>
Document 2 - file: d592389dex101.htm

</DOCUMENT>
</SEC-DOCUMENT>