View 2sk2078 stw9na80 datasheet:

STW9NA80 STH9NA80FI ? N - CHANNEL 800V - 0.85? - 9.1A - TO-247/ISOWATT218 FAST POWER MOS TRANSISTOR TYPE VDSS RDS(on) ID STW9NA80 800 V < 1.0 ? 9.1 A STH9NA80FI 800 V < 1.0 5.9 A ? TYPICAL R = 0.85 ? DS(on) ± 30V GATE TO SOURCE VOLTAGE RATING 100% AVALANCHE TESTED REPETITIVE AVALANCHE DATA AT 100oC LOW INTRINSIC CAPACITANCES 3 3 GATE CHARGE MINIMIZED 2 2 1 1 REDUCED THRESHOLD VOLTAGE SPREAD TO-247 ISOWATT218 APPLICATIONS HIGH CURRENT, HIGH SPEED SWITCHING SWITCH MODE POWER SUPPLIES (SMPS) DC-AC CONVERTERS FOR WELDING EQUIPMENT AND UNINTERRUPTIBLE INTERNAL SCHEMATIC DIAGRAM POWER SUPPLIES AND MOTOR DRIVE ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit STW9NA80 STH9NA80FI VDS Drain-source Voltage (VGS = 0) 800 V VDGR 800 V Drain- gate Voltage