View 2n6520 sam datasheet:

2N6520 PNP EPITAXIAL SILICON TRANSISTOR HIGH VOLTAGE TRANSISTOR TO-92 ABSOLUTE MAXIMUM RATINGS (T =25 ) A Characteristic Symbol Rating Unit Collector-Base Voltage VCBO -350 V Collector-Emitter Voltage VCEO -350 V Emitter-Base Voltage VEBO -5 V Collector Current IC -500 mA Base Current IB -250 mA Collector Dissipation PC 0.625 W Derate above 25 5 mW/ Junction Temperature TJ 50 Storage Temperature TSTG -55 ~ 150 1.Emitter 2. Base 3. Collector ELECTRICAL CHARACTERISTICS (T =25 ) A Characteristic Symbol Test Conditions Min Max Unit -350 Collector-Base Breakdown Voltage BVCBO IC= -100 , IE=0 V Collector-Emitter Breakdown Voltage BVCEO IC= -1mA, IB=0 -350 V Emitter-Base Breakdown Voltage BVEBO IE= -10 , IC=0 -5 V Collector Cut-off Current ICBO VCB= -250V,