View 2n3055 utc datasheet:

UTC 2N3055 SILICON NPN TRANSISTOR SILICON NPN TRANSISTORS The UTC 2N3055 is a silicon NPN transistor in TO-3 metal case. It is intended for power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers. TO-3 ABSOLUTE MAXIMUM RATINGS ( Ta=25°C ,unless otherwise specified ) PARAMETERS SYMBOL VALUE UNITS Collector-Base Voltage VCBO 100 V Collector-Emitter Voltage VCEO 60 V Emitter-Base Voltage VEBO 7 V Collector-Emitter Voltage VCEV 70 V Collector Current Ic 15 A Collector Peak Current(1) ICM 15 A Base Current IB 7 A Base Peak Current(1) IBM 15 A Total Dissipation at Ta=25°C Ptot 115 W Storage Temperature TSTG -65 to 200 °C Max. Operating Junction Temperature Tj 200 °C ELECTRICAL CHARACTERISTICS(Ta=25°C, unless otherwise specified) PAR