This part is a kind of semiconductor called STR451.

Function of this product has Replacement.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

CONCEPT PUBLISHING STR451 REPLACEMENT Exemplu de înlocuire al CI STR 451 (care nu mai este livrat de cãtre furnizori, sau dacã se gãseºte are un preþ mult prea ridicat) cu CI STR 50103. Corespondenþa dintre terminale: Configuraþia pinilor STR 451 1 - Intrare 2 - Ieºire 3 - Masã 4 - Trigger STR 451 1 2 3 4 STR 50103 1 2 3 4 1 2 4 STR 50103 3 1 2 3 4 REPAIR DATA BASE TEHNICA AV-TV & automatizãri [ ... ]

STR451 PDF Datasheet Download