This part is a kind of semiconductor called TDA7370B.

Function of this product has QUAD POWER AMPLIFIER FOR CAR RADIO.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

TDA7370B QUAD POWER AMPLIFIER FOR CAR RADIO MINIMUM EXTERNAL COMPONENT COUNT HIGH CURRENT CAPABILITY NO BOOTSTRAP CAPACITORS NO BOUCHEROT CELLS CLIP DETECTOR OUTPUT HIGH OUTPUT POWER HIGH APPLICATION FLEXIBILITY FIXED GAIN VERY LOW STAND-BY CURRENT (1µA typ) NO SWITCH ON/OFF NOISE PROTECTIONS: OUTPUT AC/DC SHORT CIRCUIT TO GND AND TO VS VERY INDUCTIVE LOADS OVERRATING CHIP TEMPERATURE LOAD DUMP VOLTAGE FORTUITOUS OPEN GND REVERSE BATTERY ESD BLOCK DIAGRAM MULTIWATT15V ORDERING NUMBER: TDA7370B DESCRIPTION The TDA7370B is a new technology class AB quad channels Audio Power Amplifier in Multiwatt package designed for car radio applications. Thanks to the fully complementary PNP/NPN output configuration the high power performances of the TDA7370B are obtained without bootstrap capacitors. [ ... ]

TDA7370B PDF Datasheet Download