This part is a kind of semiconductor called TA8271H.

Function of this product has Max Power 41W BTL x 4-Ch Audio Power IC.

Manufacturers : Toshiba

Image and pinout :

Some of the text within the PDF file :

TA8271H TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8271H Max Power 41 W BTL × 4 ch Audio Power IC The TA8271H is 4 ch BTL audio power amplifier for car audio application. This IC can generate more high power: POUTMAX = 41 W as it is included the pure complementary PNP and NPN transistor output stage. It is designed low distortion ratio for 4 ch BTL audio power amplifier, built-in stand-by function and muting function. Additionally, the AUX amplifier and various kind of protector for car audio use is built-in. Features · High power: POUTMAX (1) = 41 W (typ.) (VCC = 14.4 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUTMAX (2) = 37 W (typ.) (VCC = 13.7 V, f = 1 kHz, JEITA max, RL = 4 Ω) : POUT (1) = 24 W (typ.) (VCC = 14.4 V, f = 1 kHz, THD = 10%, RL = 4 Ω) : POUT (2) = [ ... ]

TA8271H PDF Datasheet Download