tip122.pdf datasheet:

TIP120/121/122Medium Power Linear Switching Applications Complementary to TIP125/126/127TO-22011.Base 2.Collector 3.EmitterNPN Epitaxial Darlington TransistorEquivalent CircuitAbsolute Maximum Ratings TC=25C unless otherwise notedCSymbol Parameter Value UnitsVCBO Collector-Base Voltage : TIP120 60 V : TIP121 80 VB : TIP122 100 VVCEO Collector-Emitter Voltage : TIP120 60 V : TIP121 80 V : TIP122 100 VR1 R2VEBO Emitter-Base Voltage 5 VIC Collector Current (DC) 5 AER1 8kR2 0.12kICP Collector Current (Pulse) 8 AIB Base Current (DC) 120 mAPC Collector Dissipation (Ta=25C) 2 W Collector Dissipation (TC=25C) 65 WTJ Junction Temperature 150 CTSTG Storage Temperature - 65 ~ 150 CElectrical Characteristics TC=25C unless otherwise notedSymbol Parameter Test Condition Min. Max. Units VCEO(sus) Collector-E