2sc4242.pdf datasheet:

INCHANGE Semiconductorisc Silicon NPN Power Transistor 2SC4242DESCRIPTIONCollector-Emitter Sustaining Voltage-: V = 400V(Min)CEO(SUS)Fast Switching SpeedCollector-Emitter Saturation Voltage-: V = 0.8V(Max.)@ I = 4.0ACE(sat) C100% avalanche testedMinimum Lot-to-Lot variations for robust deviceperformance and reliable operationAPPLICATIONSDesigned for use in high-voltage, high-speed , powerswitching in inductive circuit , they are particularly suitedfor 115 and 220V switchmode applications such as swit-ching regulators, inverters, DC-DC converter.ABSOLUTE MAXIMUM RATINGS(T =25)aSYMBOL PARAMETER VALUE UNITV Collector-Base Voltage 450 VCBOV Collector-Emitter Voltage 400 VCEOV Emitter-Base Voltage 8 VEBOI Collector Current-Continuous 7 ACI Collector Current-Peak 14 ACMI Base Current-Continuous 2 ABCollector