View 2n3055ag datasheet:

2N3055A (NPN),MJ15015 (NPN),MJ15016 (PNP)MJ15015 and MJ15016 are Preferred DevicesComplementary SiliconHigh-Power Transistorshttp://onsemi.comThese PowerBaset complementary transistors are designed forhigh power audio, stepping motor and other linear applications. These15 AMPEREdevices can also be used in power switching circuits such as relay orsolenoid drivers, dc-to-dc converters, inverters, or for inductive loads COMPLEMENTARY SILICONrequiring higher safe operating area than the 2N3055.POWER TRANSISTORSFeatures 60, 120 VOLTS - 115, 180 WATTS Current-Gain - Bandwidth-Product @ IC = 1.0 AdcfT = 0.8 MHz (Min) - NPN= 2.2 MHz (Min) - PNP Safe Operating Area - Rated to 60 V and 120 V, Respectively Pb-Free Packages are Available*MAXIMUM RATINGS (Note 1)Rating Symbol Value UnitCollector-Emitter Voltage VCEO VdcTO-204AA (TO-3)2N3055A

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