This part is a kind of semiconductor called TDA7298.

Function of this product has 28W Hi-Fi AUDIO POWER AMPLIFIER WITH MUTE / STAND-BY.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

TDA7298 28W Hi-Fi AUDIO POWER AMPLIFIER WITH MUTE / STAND-BY SUPPLY VOLTAGE RANGE UP TO ±22V SPLIT SUPPLY OPERATION HIGH OUTPUT POWER (UP TO 28W MUSIC POWER) LOW DISTORTION MUTE/STAND-BY FUNCTION NO SWITCH ON/OFF NOISE AC SHORT CIRCUIT PROTECTION THERMAL SHUTDOWN ESD PROTECTION DESCRIPTION The TDA7298 is a monolithic integrated circuit in Heptawatt package, intended for use as audio class AB amplifier in TV or Hi-Fi field application. Thanks to the wide voltage range and to the high out current capability it’s able to supply the highTEST AND APPLICATION CIRCUIT Heptawatt ORDERING NUMBER: TDA7298 est power into both 4Ω and 8Ω loads even in presence of poor supply regulation. The built in Muting/Stand-by function simplifies the remote operations avoiding also switching onoff noises. [ ... ]

TDA7298 PDF Datasheet Download