This part is a kind of semiconductor called BUX48.

Function of this product has SWITCHMODE II Series NPN Silicon Power Transistors.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BUX48/D SWITCHMODE II Series NPN Silicon Power Transistors The BUX 48/BUX 48A transistors are designed for high–voltage, high–speed, power switching in inductive circuits where fall time is critical. They are particularly suited for line–operated SWITCHMODE applications such as: • Switching Regulators • Inverters • Solenoid and Relay Drivers • Motor Controls • Deflection Circuits Fast Turn–Off Times 60 ns Inductive Fall Time 25_C (Typ) 120 ns Inductive Crossover Time 25_C (Typ) Operating Temperature Range –65 to + 200_C 100_C Performance Specified for: BUX48 BUX48A 15 AMPERES NPN SILICON POWER TRANSISTORS 400 AND 450 VOLTS V(BR)CEO 850 – 1000 VOLTS V(BR)CEX 175 WATTS ÎÎÎÎÎÎÎÎÎÎÎÎÎÎ [ ... ]

BUX48 PDF Datasheet Download