This part is a kind of semiconductor called BDX54C.

Function of this product has Hammer Drivers/ Audio Amplifiers Applications Power Liner and Switching Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BDX54/A/B/C BDX54/A/B/C Hammer Drivers, Audio Amplifiers Applications Power Liner and Switching Applications • Power Darlington TR • Complement to BDX53, BDX53A, BDX53B and BDX53C respectively 1 TO-220 2.Collector 3.Emitter PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Collector-Base Voltage Parameter : BDX54 : BDX54A : BDX54B : BDX54C 1.Base Value - 45 - 60 - 80 - 100 - 45 - 60 - 80 - 100 -5 -8 - 12 - 0.2 60 150 - 65 ~ 150 Units V V V V V V V V V A A A W °C °C VCEO Collector-Emitter Voltage : BDX54 : BDX54A : BDX54B : BDX54C Emitter-Base Voltage Collector Current (DC) *Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature VEBO IC ICP IB PC TJ TSTG Electrical [ ... ]

BDX54C PDF Datasheet Download