    <SEC-DOCUMENT>0000889331-19-000019-index.html : 20190315
    <SEC-HEADER>0000889331-19-000019.hdr.sgml : 20190315
    <ACCEPTANCE-DATETIME>20190315090559
    ACCESSION NUMBER:		0000889331-19-000019
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20190426
    FILED AS OF DATE:		20190315
    DATE AS OF CHANGE:		20190315
    EFFECTIVENESS DATE:		20190315

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			LITTELFUSE INC /DE
    		CENTRAL INDEX KEY:			0000889331
    		STANDARD INDUSTRIAL CLASSIFICATION:	SWITCHGEAR & SWITCHBOARD APPARATUS [3613]
    		IRS NUMBER:				363795742
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1229

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-20388
    		FILM NUMBER:		19683155

    	BUSINESS ADDRESS:
    		STREET 1:		8755 WEST HIGGINS ROAD
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60631
    		BUSINESS PHONE:		773-628-1000

    	MAIL ADDRESS:
    		STREET 1:		8755 WEST HIGGINS ROAD
    		CITY:			CHICAGO
    		STATE:			IL
    		ZIP:			60631
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>proxystatementdef14a.htm
    <DESCRIPTION>LITTELFUSE 2019 PROXY STATEMENT
    <TEXT>
    Document 1 - file: proxystatementdef14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>image05.jpg
    <TEXT>
    Document 2 - file: image05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>image06.jpg
    <TEXT>
    Document 3 - file: image06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>image07.jpg
    <TEXT>
    Document 4 - file: image07.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>image08.jpg
    <TEXT>
    Document 5 - file: image08.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>image09.jpg
    <TEXT>
    Document 6 - file: image09.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>image10.jpg
    <TEXT>
    Document 7 - file: image10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>image11.jpg
    <TEXT>
    Document 8 - file: image11.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>image13.jpg
    <TEXT>
    Document 9 - file: image13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>image16.jpg
    <TEXT>
    Document 10 - file: image16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>kristinacernigliabw002a01.jpg
    <TEXT>
    Document 11 - file: kristinacernigliabw002a01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>logotaglinepms348.jpg
    <TEXT>
    Document 12 - file: logotaglinepms348.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>proxycardfinal001.jpg
    <TEXT>
    Document 13 - file: proxycardfinal001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>proxycardfinal002.jpg
    <TEXT>
    Document 14 - file: proxycardfinal002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>stafford_sig.jpg
    <TEXT>
    Document 15 - file: stafford_sig.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>