View 2sa928a utc datasheet:

UTC A928A PNP EPITAXIAL SILICON TRANSISTOR AUDIO POWER AMPLIFIER FEATURES *Collector Dissipation Pc=1 Watt *3 Watt Output Application TO-92L 1:EMITTER 2: COLLECTOR 3: BASE ABSOLUTE MAXIMUM RATINGS ( Ta=25°C ,unless otherwise specified ) PARAMETER SYMBOL RATING UNIT Collector-base voltage VCBO -30 V Collector-emitter voltage VCEO -30 V Emitter-base voltage VEBO -5 V Collector dissipation Pc 1 W Collector current Ic -2 A Junction Temperature Tj 150 °C Storage Temperature TSTG -55 ~ +150 °C ELECTRICAL CHARACTERISTICS(Ta=25°C, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Collector-base breakdown voltage BVCBO Ic=-100µA,IE=0 -30 V Collector-emitter breakdown voltage BVCEO Ic=-10mA,IB=0 -30 V Emitter-base breakdown voltage BVEBO IE=-1mA,Ic=0