View bu508af datasheet:

BU508AF TV Horizontal Output Applications TO-3PF 1 1.Base 2.Collector 3.Emitter NPN Triple Diffused Planar Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol Parameter Value Units VCES Collector-Emitter Voltage 1500 V VCEO Collector-Emitter Voltage 700 V VEBO Emitter-Base Voltage 5 V IC Collector Current (DC) 5 A ICP *Collector Current (Pulse) 15 A PC Collector Dissipation (TC=25°C) 60 W TJ Junction Temperature 150 °C TSTG Storage Temperature - 65 ~ 150 °C Electrical Characteristics TC=25°C unless otherwise noted Symbol Parameter Test Condition Min. Typ. Max. Units VCEO(sus) * Collector-Emitter Sustaining Voltage IC = 100mA, IB = 0 700 V BVEBO Emitter-Base Breakdown Voltage IE = 10mA, IC = 0 5 V ICES Collector Cut-off Current VC