View 2sc4457 datasheet:

Ordering number:EN3328 NPN Triple Diffused Planar Silicon Transistor 2SC4457 500V/4A Switching Regulator Applications Features Package Dimensions · High breakdown voltage, high reliability. unit:mm · Fast switching speed. 2039D · Wide ASO. [2SC4457] · Adoption of MBIT process. 16.0 5.6 3.4 · Micaless package facilitating mounting. 3.1 2.8 2.0 2.0 1.0 0.6 1 : Base 1 2 3 2 : Collector 3 : Emitter 5.45 5.45 SANYO : TO-3PML Specifications Absolute Maximum Ratings at Ta = 25?C Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO 800 V Collector-to-Emitter Voltage VCEO 500 V Emitter-to-Base Voltage VEBO 7 V Collector Current IC 4 A Collector Current (Pulse) ICP PW? 300µ s, duty cycle? 10% 8 A Base Current IB 1.5 A Collector Dissipation PC