This part is a kind of semiconductor called TDA7850.

Function of this product has 4 x 50W MOSFET Quad Bridge Power Amplifier Plus HSD.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

TDA7850 4 x 50W MOSFET Quad bridge power amplifier plus HSD Features ■ Superior output power capability: 4 x 50W/4Ω Max. 4 x 30W/4Ω @ 14.4V, 1KHz, 10% 4 x 80W/2Ω Max. 4 x 55W/2Ω @ 14.4V, 1KHz, 10% MOSFET Output power stage Excellent 2Ω driving capability HI-FI class distortion Low output noise ST-BY Function Mute function Automute at min. supply voltage detection Low external component count: – Internally fixed gain (26dB) – No external compensation – No bootstrap capacitors On board 0.35A high side driver Flexiwatt25 (Horizontal) Flexiwatt25 (Vertical) ■ ■ ■ ■ ■ ■ ■ ■ ■ Protections: ■ ■ ■ ■ ■ ■ ■ ■ Output short circuit to GND, to Vs, across the load Very inductive loads Overrating chip temperature with soft thermal l [ ... ]

TDA7850 PDF Datasheet Download