View 2n3772 datasheet:

UTC 2N3772 SILICON NPN TRANSISTOR SILICON NPN TRANSISTORS The UTC 2N3772 is a power-base power transistor in TO-3 metal case. It is designed for linear amplifiers, series pass regulators, and inductive switching applications. 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 80 V Collector Current Ic 30 A Collector Peak Current(1) ICM 30 A Base Current IB 5 A Base Peak Current(1) IBM 15 A Total Dissipation at Ta=25°C Ptot 150 W Storage Temperature TSTG -65 ~ +200 °C Max. Operating Junction Temperature Tj 200 °C ELECTRICAL CHARACTERISTICS(Ta=25°C, unless otherwise specified) PARAMETER SYMBOL