View 2sc4601 datasheet:

Ordering number:EN3147 NPN Triple Diffused Planar Silicon Transistor 2SC4601 Switching Regulator Applications Features Package Dimensions · Surface mount type device making the following unit:mm possible. 2069C -Reduction in the number of manufacturing pro- [2SC4601] cesses for 2SC4601-applied equipment. 10.2 4.5 1.3 -High density surface mount applications. -Small size of 2SC4601-applied equipment. · High breakdown voltage, high reliability. · Fast switching speed. · Wide ASO. · Adoption of MBIT process. 1 2 3 0 to 0.3 0.8 1.2 0.4 2.55 2.55 1 : Base 2 : Collector 3 : Emitter 2.55 2.55 SANYO : SMP-FD Specifications Absolute Maximum Ratings at Ta = 25?C Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO 1100 V Collector-to-Emitter