This part is a kind of semiconductor called W7NK90Z.

Function of this product has STW7NK90Z.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STP6NK90Z - STP6NK90ZFP STB6NK90Z - STW7NK90Z N-CHANNEL 900V - 1.56Ω - 5.8A TO-220/FP/D2PAK/TO-247 Zener-Protected SuperMESH™Power MOSFET TYPE STP6NK90Z STP6NK90ZFP STB6NK90Z STW7NK90Z s s s s s s VDSS 900 900 900 900 V V V V RDS(on) <2 <2 <2 <2 Ω Ω Ω Ω ID 5.8 A 5.8 A 5.8 A 5.8 A Pw 140 W 30 W 140 W 140 W 3 1 2 TYPICAL RDS(on) = 1.56 Ω EXTREMELY HIGH dv/dt CAPABILITY 100% AVALANCHE TESTED GATE CHARGE MINIMIZED VERY LOW INTRINSIC CAPACITANCES VERY GOOD MANUFACTURING REPEATIBILITY TO-220 TO-220FP 3 1 1 3 2 D2PAK TO-247 DESCRIPTION The SuperMESH™ series is obtained through an extreme optimization of ST’s well established stripbased PowerMESH™ layout. In addition to pushing on-resistance significantly down, special care is taken to ensure a very good dv/dt capa [ ... ]

W7NK90Z PDF Datasheet Download