View stp7nk40z datasheet:

STP7NK40Z - STP7NK40ZFP STD7NK40Z - STD7NK40Z-1 N-CHANNEL 400V-0.85?-5.4A TO-220/TO-220FP/DPAK/IPAK Zener-Protected SuperMESH™Power MOSFET TYPE VDSS RDS(on) ID Pw STP7NK40Z 400 V < 1 ? 5.4 A 70 W STP7NK40ZFP 400 V < 1 ? 5.4 A 25 W STD7NK40Z 400 V < 1 ? 5.4 A 70 W STD7NK40Z-1 400 V < 1 ? 5.4 A 70 W 3 TYPICAL RDS(on) = 0.85 ? 2 1 EXTREMELY HIGH dv/dt CAPABILITY TO-220 TO-220FP 100% AVALANCHE TESTED GATE CHARGE MINIMIZED VERY LOW INTRINSIC CAPACITANCES 3 VERY GOOD MANUFACTURING 3 2 1 REPEATIBILITY 1 IPAK DPAK DESCRIPTION The SuperMESH™ series is obtained through an extreme optimization of ST’s well established strip- INTERNAL SCHEMATIC DIAGRAM based PowerMESH™ layout. In addition to pushing on-resistance significantly down, special care is tak- en to ens