This part is a kind of semiconductor called W5NB90.

Function of this product has STW5NB90.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® STW5NB90 N - CHANNEL 900V - 2.3Ω - 5.6A - TO-247 PowerMESH™ MOSFET TYPE ST W5NB90 s s s s s V DSS 900 V R DS(on) < 2.5 Ω ID 5.6 A TYPICAL RDS(on) = 2.3 Ω EXTREMELY HIGH dv/dt CAPABILITY 100% AVALANCHE TESTED VERY LOW INTRINSIC CAPACITANCES GATE CHARGE MINIMIZED 3 2 1 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. APPLICATIONS SWITCH MODE POWER SUPPLIES (SMPS) s DC-AC CONVERTERS FOR WELDING EQUIPME [ ... ]

W5NB90 PDF Datasheet Download