This part is a kind of semiconductor called W9NB90.

Function of this product has STW9NB90.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

® STW9NB90 N-CHANNEL 900V - 0.85Ω - 9.7A - TO-247 PowerMESH™ MOSFET TYPE V DSS RDS(on) ID S TW 9NB9 0 900 V <1Ω 9.7 A s TYPICAL RDS(on) = 0.85 Ω s EXTREMELY HIGH dv/dt CAPABILITY s ± 30V GATE TO SOURCE VOLTAGE RATING s 100% AVALANCHE TESTED s VERY LOW INTRINSIC CAPACITANCES s 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. APPLICATIONS s HIGH CURRENT, HIGH SPEED SWITCHING s SWITCH MODE POWER S [ ... ]

W9NB90 PDF Datasheet Download