bux18 bux18a bux18b bux18c.pdf datasheet:

isc Silicon NPN Power Transistors BUX18/A/B/CDESCRIPTIONCollector-Emitter Sustaining Voltage-: V = 200V(Min)- BUX18CEO(SUS)= 325V(Min)- BUX18A= 375V(Min)- BUX18B= 425V(Min)- BUX18CHigh Switching SpeedHigh Power DissipationMinimum Lot-to-Lot variations for robust deviceperformance and reliable operationAPPLICATIONSDesigned for use in off-line power supplies and is also wellsuited for use in a wide range of inverter or converter circuitsand pulse-width-modulated regulators.ABSOLUTE MAXIMUM RATINGS(T =25)aSYMBOL PARAMETER VALUE UNITBUX18 250BUX18A 350Collector-Emitter VoltageV VCEVV = -1.5VBEBUX18B 400BUX18C 475BUX18 200BUX18A 275V Collector-Emitter Voltage VCEO(SUS)BUX18B 325BUX18C 375V Emitter-Base Voltage 6 VEBOI Collector Current-Continuous 8 ACCollector PowerP 120 WCDissipation@T =25C