This part is a kind of semiconductor called TDA2051H.

Function of this product has 40W Hi-Fi AUDIO POWER AMPLIFIER.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

TDA2051 40W Hi-Fi AUDIO POWER AMPLIFIER HIGH OUTPUT POWER (60W/4Ω MUSIC POWER IEC 268.3 RULES) HIGH OPERATING SUPPLY VOLTAGE (±25V) SINGLE OR SPLIT SUPPLY OPERATIONS VERY LOW DISTORTION SHORT CIRCUIT PROTECTION (OUT TO GND) THERMAL SHUTDOWN PENTAWATT V DESCRIPTION The TDA 2051 is a monolithic integrated circuit in Pentawatt package, intended for use as an audio class AB amplifier. Thanks to its high power capability the TDA2051 is able to provide up to 40W typ. into 4 ohm load @ THD = 10%, VS = ±18V, f = 1KHz and up to 33W into 8ohm load @ THD = 10%, VS = ±22V, f = 1KHz. Moreover, the TDA 2051 delivers typically 60W music power into 4 ohm load over 1 sec at VS= 22.5V, f = 1KHz. The very low harmonic and crossover distortion TEST AND APPLICATION CIRCUIT ORDERING NUMBERS: TDA2051V TDA [ ... ]

TDA2051H PDF Datasheet Download