This part is a kind of semiconductor called IRF640.

Function of this product has N-channel TrenchMOS transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

Philips Semiconductors Product specification N-channel TrenchMOS™ transistor IRF640, IRF640S FEATURES • ’Trench’ technology • Low on-state resistance • Fast switching • Low thermal resistance SYMBOL d QUICK REFERENCE DATA VDSS = 200 V ID = 16 A g RDS(ON) ≤ 180 mΩ s GENERAL DESCRIPTION N-channel, enhancement mode field-effect power transistor using Trench technology, intended for use in off-line switched mode power supplies, T.V. and computer monitor power supplies, d.c. to d.c. converters, motor control circuits and general purpose switching applications. The IRF640 is supplied in the SOT78 (TO220AB) conventional leaded package. The IRF640S is supplied in the SOT404 (D2PAK) surface mounting package. PINNING PIN 1 2 3 tab gate drain1 source drain DESCRIPTION SOT7 [ ... ]

IRF640 PDF Datasheet Download