View std2n50 datasheet:

STD2N50 N - CHANNEL ENHANCEMENT MODE POWER MOS TRANSISTOR TYPE V R I DSS DS(on) D STD2N50 500 V < 5.5 ? 2 A TYPICAL R = 4.5 ? DS(on) AVALANCHE RUGGED TECHNOLOGY 100% AVALANCHE TESTED REPETITIVE AVALANCHE DATA AT 100oC 3 APPLICATION ORIENTED 3 2 CHARACTERIZATION 1 1 THROUGH-HOLE IPAK (TO-251) POWER PACKAGE IN TUBE (SUFFIX ”-1”) SURFACE-MOUNTING DPAK (TO-252) IPAK DPAK POWER PACKAGE IN TAPE & REEL TO-251 TO-252 (SUFFIX ”T4”) (Suffix ”-1”) (Suffix ”T4”) APPLICATIONS HIGH CURRENT, HIGH SPEED SWITCHING SWITCH MODE POWER SUPPLIES (SMPS) INTERNAL SCHEMATIC DIAGRAM CHOPPER REGULATORS, CONVERTERS, MOTOR CONTROL, LIGHTING FOR INDUSTRIAL AND CONSUMER ENVIRONMENT ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VDS Drain-source Voltage (VGS = 0) 500 V