This part is a kind of semiconductor called BDX54C.

Function of this product has Plastic Medium-Power Complementary Silicon Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BDX53B/D Plastic Medium-Power Complementary Silicon Transistors . . . designed for general–purpose amplifier and low–speed switching applications. • High DC Current Gain hFE = 2500 (Typ) @ IC = 4.0 Adc • Collector Emitter Sustaining Voltage @ 100 mAdc VCEO(sus) = 80 Vdc (Min) BDX53B, 54B VCEO(sus) = 100 Vdc (Min) BDX53C, 54C • Low Collector–Emitter Saturation Voltage VCE(sat) = 2.0 Vdc (Max) @ IC = 3.0 Adc VCE(sat) = 4.0 Vdc (Max) @ IC = 5.0 Adc • Monolithic Construction with Built–In Base–Emitter Shunt Resistors • TO–220AB Compact Package MAXIMUM RATINGS BDX53B BDX53C BDX54B BDX54C DARLINGTON 8 AMPERE COMPLEMENTARY SILICON POWER TRANSISTORS 80 – 100 VOLTS 65 WATTS NPN PNP ÎÎÎ [ ... ]

BDX54C PDF Datasheet Download