This part is a kind of semiconductor called BD810.

Function of this product has Silicon PNP Power Transistors.

Manufacturers : Savantic

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Silicon PNP Power Transistors Product Specification BD810 DESCRIPTION ·With TO-220C package ·Complement to type BD809 ·DC current gain : hFE = 30 (Min) @ IC = 2.0 Adc APPLICATIONS ·Designed for use in high power audio amplifiers utilizing complementary or quasi complementary circuits. PINNING PIN 1 2 3 DESCRIPTION Emitter Collector;connected to mounting base Base Absolute maximum ratings (Ta=25 ) SYMBOL PARAMETER VCBO VCEO VEBO IC IB PD Tj Tstg Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Total power dissipation Junction temperature Storage temperature CONDITIONS Open emitter Open base Open collector TC=25 THERMAL CHARACTERISTICS SYMBOL PARAMETER Rth j-c Thermal resistance junction to case VAL [ ... ]

BD810 PDF Datasheet Download