This part is a kind of semiconductor called BD244.

Function of this product has Medium Power Linear and Switching Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BD244/A/B/C BD244/A/B/C Medium Power Linear and Switching Applications • Complement to BD243, BD243A, BD243B and BD243C respectively 1 TO-220 2.Collector 3.Emitter 1.Base PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Parameter Collector-Base Voltage : BD244 : BD244A : BD244B : BD244C VCEO Collector-Emitter Voltage : BD244 : BD244A : BD244B : BD244C Emitter-Base Voltage Collector Current (DC) *Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature - 45 - 60 - 80 - 100 - 45 - 60 - 80 - 100 -5 -6 - 10 -2 65 150 - 65 ~ 150 V V V V V V V V V A A A W °C °C Value Units VEBO IC ICP IB PC TJ TSTG Electrical Characteristics TC=25°C unless otherwise noted Symbol VCEO(sus) Para [ ... ]

BD244 PDF Datasheet Download