This part is a kind of semiconductor called BD243C.

Function of this product has Complementary Silicon Plastic Power Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BD243B/D Complementary Silicon Plastic Power Transistors . . . designed for use in general purpose amplifier and switching applications. • Collector – Emitter Saturation Voltage VCE(sat) = 1.5 Vdc (Max) @ IC = 6.0 Adc • Collector Emitter Sustaining Voltage VCEO(sus) = 80 Vdc (Min) BD243B, BD244B VCEO(sus) = 100 Vdc (Min) BD243C, BD244C • High Current Gain Bandwidth Product fT = 3.0 MHz (Min) @ IC = 500 mAdc • Compact TO–220 AB Package MAXIMUM RATINGS BD243B BD243C* PNP BD244B BD244C* *Motorola Preferred Device NPN ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎÎ ÎÎÎ ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ [ ... ]

BD243C PDF Datasheet Download