View 2sc3751 datasheet:

Ordering number : ENN1970B 2SC3751 NPN Triple Diffused Planar Silicon Transistor 2SC3751 800V / 1.5A Switching Regulator Applications Features Package Dimensions • High breakdown voltage and high reliability. unit : mm • Fast switching speed. 2041A • Wide ASO. [2SC3751] • Adoption of MBIT process. 4.5 • Micaless package facilitating mounting. 10.0 2.8 3.2 2.4 1.6 1.2 0.7 0.75 1 2 3 1 : Base 2.55 2.55 2 : Collector 3 : Emitter Specifications 2.55 Absolute Maximum Ratings at Ta=25°C 2.55 SANYO : TO-220ML Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO 1100 V Collector-to-Emitter Voltage VCEO 800 V Emitter-to-Base Voltage VEBO 7 V Collector Current IC 1.5 A Collector Current (Pulse) ICP PW?300µs, Duty Cycle?10% 5 A Base Current IB 0