This part is a kind of semiconductor called P5NK80Z.

Function of this product has STP5NK80Z.

Manufacturers : STMicroelectronics

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Some of the text within the PDF file :

STP5NK80Z STP5NK80ZFP N-channel 800V - 1.9Ω - 4.3A - TO-220/TO-220FP Zener-protected SuperMESH™ Power MOSFET General features Type VDSS (@Tjmax) 800 V 800 V RDS(on) < 2.4 Ω < 2.4 Ω ID 4.3 A 4.3 A 3 1 2 STP5NK80Z STP5NK80ZFP ■ ■ ■ ■ 100% avalanche tested Gate charge minimized Very low intrinsic capacitances Very good manufacturing repeatibility TO-220 TO-220FP 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™ pro [ ... ]

P5NK80Z PDF Datasheet Download