This part is a kind of semiconductor called TDA1521A.

Function of this product has 2 x 6 W hi-fi audio power amplifier.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

INTEGRATED CIRCUITS DATA SHEET TDA1521A 2 x 6 W hi-fi audio power amplifier Product specification File under Integrated Circuits, IC01 July 1994 Philips Semiconductors Product specification 2 x 6 W hi-fi audio power amplifier GENERAL DESCRIPTION TDA1521A The TDA1521A is a dual hi-fi audio power amplifier encapsulated in a 9-lead plastic power package. The device is especially designed for mains fed applications (e.g. stereo tv sound and stereo radio). Features • Requires very few external components • Input muted during power-on and off (no switch-on or switch-off clicks) • Low offset voltage between output and ground • Excellent gain balance between channels • Hi-fi according to IEC 268 and DIN 45500 • Short-circuit-proof • Thermally protected. QUICK REFERENCE DAT [ ... ]

TDA1521A PDF Datasheet Download