This part is a kind of semiconductor called TDA1557Q.
Function of this product has 2 x 22 W BTL stereo car radio power amplifier with speaker protection.
Manufacturers : NXP
Image and pinout :
Some of the text within the PDF file :
INTEGRATED CIRCUITS DATA SHEET TDA1557Q 2 x 22 W BTL stereo car radio power amplifier with speaker protection Product speciﬁcation File under Integrated Circuits, IC01 May 1992 Philips Semiconductors Product speciﬁcation 2 x 22 W BTL stereo car radio power ampliﬁer with speaker protection FEATURES • Requires very few external components • High output power • Low offset voltage at output • Fixed gain • Good ripple rejection • Mute/stand-by switch • Load dump protection • AC and DC short-circuit-safe to ground and VP • Thermally protected • Reverse polarity safe • Capability to handle high energy on outputs (VP = 0) QUICK REFERENCE DATA SYMBOL VP PARAMETER positive supply voltage range operating non-operating load dump IORM Itot Isb Isw ZI TXTAL PO SVRR [ ... ]