View 2sd1723 datasheet:

Ordering number:2021A PNP/NPN Epitaxial Planar Silicon Transistors 2SB1166/2SD1723 50V/8A Switching Applications Applications Package Dimensions · Relay drivers, high-speed inverters, converters. unit:mm 2043A Features [2SB1166/2SD1723] · Low collector-to-emitter saturation voltage. · High fT. · Excellent linearity of hFE. · Fast switchint time. B : Base C : Collector E : Emitter ( ) : 2SB1166 SANYO : TO-126LP Specifications Absolute Maximum Ratings at Ta = 25?C Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO (–)60 V Collector-to-Emitter Voltage VCEO (–)50 V Emitter-to-Base Voltage VEBO (–)6 V Collector Current IC (–)8 A Collector Current (Pulse) ICP (–)12 A Collector Dissipation PC 1.2 W Tc=25?C 20 W ?C Junction Temperature Tj 150