mje340t.pdf datasheet:

isc Silicon NPN Power Transistor MJE340TDESCRIPTIONCollectorEmitter Sustaining Voltage-: V = 300 V(Min)CEO(SUS)DC Current Gain-: h = 100(Min) @ I = 50mAFE CLow Collector Saturation Voltage-: V = 1.0V(Max.)@ I = 50mACE(sat) CMinimum Lot-to-Lot variations for robust deviceperformance and reliable operationAPPLICATIONSDesigned for high voltage and general purpose applications.ABSOLUTE MAXIMUM RATINGS(T =25)aSYMBOL PARAMETER VALUE UNITV Collector-Base Voltage 300 VCBOV Collector-Emitter Voltage 300 VCEOV Emitter-Base Voltage 3 VEBOI Collector Current-Continuous 0.5 ACCollector Power DissipationP 20 WCT =25CJunction Temperature 150 TiStorage Temperature Range -65~150 TstgTHERMAL CHARACTERISTICSSYMBOL PARAMETER MAX UNITR Thermal Resistance,Junction to Case 6.25 /Wth j-c1isc Websit