View 2sc3446 datasheet:

Ordering number:EN1544B NPN Triple Diffused Planar Silicon Transistor 2SC3446 500V/3A Switching Regulator Applications Features Package Dimensions · High breakdown voltage and high reliability. unit:mm · Fast switching speed (tf : 0.1µ s typ). 2010C · Wide ASO. [2SC3446] · Adoption of MBIT process. 1 : Base JEDEC : TO-220AB 2 : Collector EIAJ : SC-46 3 : Emitter 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 3 A Collector Current (Pulse) ICP PW? 300µ s, Duty Cycle? 10% 6 A Base Current IB 1 A Collector Dissipation PC Tc=25?C 40 W Junction Temperature Tj 150 ?C Storage Temperature Tst