This part is a kind of semiconductor called BD909.

Function of this product has NPN PLASTIC POWER TRANSISTOR.

Manufacturers : CDIL

Image and pinout :

Some of the text within the PDF file :

Continental Device India Limited An ISO/TS 16949, ISO 9001 and ISO 14001 Certified Company PLASTIC POWER TRANSISTORS BD 905, 907, 909, 911 NPN BD906, 908, 910, 912 PNP TO-220 Plastic Package Power Linear and Switching Applications ABSOLUTE MAXIMUM RATINGS (Ta=25ºC unless specified otherwise ) DESCRIPTION SYMBOL Collector -Emitter Voltage Collector -Base Voltage Emitter -Base Voltage Emitter and Collector Current Base Current Total Power Dissipation up to Tc=25oC Junction Temperature Temperature Range VCEO VCBO VEBO IE, IC IB Ptot Tj Tstg ELECTRICAL CHARACTERISTICS (Tc=25ºC Unless Otherwise Specified) DESCRIPTION SYMBOL Breakdown (sus) Voltage Collector-Cut off Current VCEO(sus)* IC=50mA, IB=0 ICEO VCE =30V, IB=0 VCE =40V, IB=0 VCE =50V, IB=0 ICBO IE=0,VCB=Rated VCBO, IE=0,VCB [ ... ]

BD909 PDF Datasheet Download