This part is a kind of semiconductor called W12NK90Z.

Function of this product has STW12NK90Z.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STW12NK90Z N-channel 900V - 0.72Ω - 11A - TO-247 Zener-protected SuperMESH™ Power MOSFET General features Type STW12NK90Z ■ ■ ■ ■ ■ VDSS 900V RDS(on) <0.88Ω ID 11A pW 230W Extremely high dv/dt capability 100% avalanche tested Gate charge minimized Very low intrinsic capacitances Very good manufacturing repeatibility TO-247 Description The SuperMESH™ series is obtained through an extreme optimization of ST’s well established strip-based PowerMESH™ layout. In addition to pushing on-resistance significantly down, special care is taken to ensure a very good dv/dt capability for the most demanding applications. Such series complements ST full range of high voltage MOSFETs including revolutionary MDmesh™ products. Internal schematic diagram Applications ■ Switc [ ... ]

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