View std4na40 datasheet:

STD4NA40 N - CHANNEL ENHANCEMENT MODE FAST POWER MOS TRANSISTOR TYPE V R I DSS DS(on) D STD4NA40 400 V < 2 ? 3.3 A TYPICAL R = 1.7 ? 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 SPEED SWITCHING UNINTERRUPTIBLE POWER SUPPLY (UPS) INTERNAL SCHEMATIC DIAGRAM MOTOR CONTROL, AUDIO AMPLIFIERS INDUSTRIAL ACTUATORS DC-DC & DC-AC CONVERTERS FOR TELECOM, INDUSTRIAL AND CONSUMER ENVIRONMENT PARTICULARLY SUITABLE FOR ELECTRONIC FLUORESCENT LAMP BALLASTS A