View 2n3055a1 datasheet:

Order this document MOTOROLA by 2N3055A/D SEMICONDUCTOR TECHNICAL DATA NPN Complementary Silicon 2N3055A High-Power Transistors * MJ15015 . . . PowerBase complementary transistors designed for high power audio, stepping motor and other linear applications. These devices can also be used in power switching circuits such as relay or solenoid drivers, dc–to–dc converters, inverters, or MJ2955A for inductive loads requiring higher safe operating area than the 2N3055 and MJ2955. PNP • Current–Gain — Bandwidth–Product @ IC = 1.0 Adc MJ15016* fT = 0.8 MHz (Min) – NPN IIIIIIIIIIIIIIIIIIIIIII = 2.2 MHz (Min) – PNP *Motorola Preferred Device • Safe Operating Area — Rated to 60 V and 120 V, Respectively IIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIII IIII III IIIII IIII 15 AMPERE IIIII