View stp3na90 datasheet:

STP3NA90 STP3NA90FI N - CHANNEL ENHANCEMENT MODE FAST POWER MOS TRANSISTOR PRELIMINARY DATA TYPE VDSS RDS(on) ID STP3NA90 900 V < 5.3 ? 3 A STP3NA90FI 900 V < 5.3 ? 1.9 A TYPICAL R = 4.4 ? DS(on) ± 30V GATE TO SOURCE VOLTAGE RATING 100% AVALANCHE TESTED REPETITIVE AVALANCHE DATA AT 100oC 3 3 LOW INTRINSIC CAPACITANCES 2 2 1 1 GATE CHARGE MINIMIZED REDUCED THRESHOLD VOLTAGE SPREAD TO-220 ISOWATT220 APPLICATIONS HIGH CURRENT, HIGH SPEED SWITCHING SWITCH MODE POWER SUPPLIES (SMPS) DC-AC CONVERTERS FOR WELDING EQUIPMENT AND UNINTERRUPTIBLE POWER SUPPLIES AND MOTOR DRIVE INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit STP3NA90 STP3NA90FI VDS Drain-Source Voltage (Vgs = 0) 900 V VDGR Drain-Gate Voltage (Rgs = 20 K?) 900