View 2sa1257 datasheet:

Ordering number:ENN1057C PNP/NPN Epitaxial Planar Silicon Transistors 2SA1257/2SC3143 High-Voltage Switching, AF Power Amp, 100W Output Predriver Applications Features Package Dimensions · Very small-sized package permitting the 2SA1257/ unit:mm 2SC3143-applied sets to be made small and slim. 2018B · High breakdown voltage (VCEO? 160V). [2SA1257/2SC3143] · Small output capacitance. 0.4 0.16 3 0 to 0.1 1 0.95 0.95 2 1.9 2.9 1 : Base 2 : Emitter ( ) : 2SA1257 3 : Collector SANYO : CP Specifications Absolute Maximum Ratings at Ta = 25?C Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO (–)180 V Collector-to-Emitter Voltage VCEO (–)160 V Emitter-to-Base Voltage VEBO (–)5 V Collector Current IC (–)80 mA Collector Current Pulse ICP (–)150 m