View 2n7228 datasheet:

DTO-254G2N7228 500 Volt 0.415SJX2N7228*JV2N7228*TMPOWER MOS IV*QUALIFIED TO MIL-S-19500/592 31/7/92JEDEC REGISTERED N - CHANNEL HIGH VOLTAGE POWER MOSFETSMAXIMUM RATINGS All Ratings: TC = 25C unless otherwise specified.Symbol Parameter 2N7228 UNITVDSS Drain-Source Voltage500VoltsVGS Gate-Source Voltage20Continuous Drain Current @ TC = 25C12IDContinuous Drain Current @ TC = 100C 8AmpsIDM Pulsed Drain Current 148IAR Avalanche Current 112Total Power Dissipation @ TC = 25C150WattsPD Total Power Dissipation @ TC = 100C60Linear Derating Factor1.2 W/KEASSingle Pulse Avalanche Energy750mJEAR Repetitive Avalanche Energy15TJ,TSTG Operating and Storage Junction Temperature Range-55 to 150CTLMax. Lead Temp. for Soldering Conditions: 0.063" from Case for 10 Sec.300STATIC ELECTRICAL CHARACTE

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