This part is a kind of semiconductor called BDX54C.

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

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

BDX53B, BDX53C (NPN), BDX54B, BDX54C (PNP) Plastic Medium-Power Complementary Silicon Transistors These devices are designed for general−purpose amplifier and low−speed switching applications. Features • 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 • These Devices are Pb−Free and are RoHS Compliant* ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎMAXIMUM RATINGS ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎRating Symbol Value Unit Î [ ... ]

BDX54C PDF Datasheet Download