This part is a kind of semiconductor called BDT63B.

Function of this product has Silicon Darlington Power Transistor.

Manufacturers : Comset Semiconductors

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTORS BDT63-A-B-C SILICON DARLINGTON POWER TRANSISTORS NPN epitaxial-base transistors in a monolithic Dalrington circuit and housed in a TO-220 envelope. They are intended for output stages in audio equipment, general amplifiers, and analogue switching application. PNP complements are BDT62-A-B-C Compliance to RoHS. ABSOLUTE MAXIMUM RATINGS Symbol Ratings BDT63 BDT63A BDT63B BDT63C BDT63 BDT63A BDT63B BDT63C BDT63 BDT63A Value 60 80 100 120 60 80 100 120 Unit VCBO Collector-Base Voltage www.DataSheet.net/ V VCEO Collector-Emitter Voltage V VEBO Emitter-Base Voltage BDT63B BDT63C BDT63 BDT63A 5 V IC Collector Current BDT63B BDT63C BDT63 BDT63A 10 A ICM Collector Peak Current BDT63B BDT63C 15 A 26/09/2012 COMSET SEMICONDUCTORS 1|5 Datasheet pdf - http: [ ... ]

BDT63B PDF Datasheet Download