This part is a kind of semiconductor called P3NB80FP.

Function of this product has STP3NB80FP.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

m o .c U 4 STP3NB80 t e STP3NB80FP e h S N - CHANNEL 800V - 4.6Ω - 2.6A - TO-220/TO-220FP a t PowerMESH™ MOSFET a .D w w w ® TYPE V DSS R DS(on) ID STP3NB80 STP3NB80FP 800 V 800 V < 6.5 Ω < 6.5 Ω 2.6 A 2.6 A s s s s s TYPICAL RDS(on) = 4.6 Ω EXTREMELY HIGH dv/dt CAPABILITY 100% AVALANCHE TESTED VERY LOW INTRINSIC CAPACITANCES GATE CHARGE MINIMIZED DESCRIPTION Using the latest high voltage MESH OVERLAY™ process, STMicroelectronics has designed an advanced family of power MOSFETs with outstanding performances. The new patent pending strip layout coupled with the Company’s proprietary edge termination structure, gives the lowest RDS(on) per area, exceptional avalanche and dv/dt capabilities and unrivalled gate charge and switching characteristics [ ... ]

P3NB80FP PDF Datasheet Download