STMicroelectronics, Inc. Single Bipolar Transistors BUX48

The BUX48 is an NPN silicon transistor designed for switching applications in switch mode power supplies and flyback converters. It is mounted in a TO-3 metal case and rated for a collector-emitter voltage of 400 V (VCEO), a continuous collector current of 15 A, and a total power dissipation of 175 W at Tc = 25 °C. The maximum junction temperature is 200 °C. Thermal resistance from junction to case is 1 °C/W. Pulsed collector peak current reaches 55 A, and base current is rated up to 4 A. Switching times are specified for 10 A collector current: turn-on time is 1 µs, storage time is 3 µs, and fall time is 0.8 µs. Emitter-base voltage is rated at 7 V.