This part is a kind of semiconductor called IRF840.

Function of this product has PowerMOS transistor Avalanche energy rated.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

Philips Semiconductors Product specification PowerMOS transistor Avalanche energy rated FEATURES • Repetitive Avalanche Rated • Fast switching • High thermal cycling performance • Low thermal resistance g IRF840 SYMBOL d QUICK REFERENCE DATA VDSS = 500 V ID = 8.5 A RDS(ON) ≤ 0.85 Ω s GENERAL DESCRIPTION N-channel, enhancement mode field-effect power transistor, 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 IRF840 is supplied in the SOT78 (TO220AB) conventional leaded package. PINNING PIN 1 2 3 tab gate drain source drain DESCRIPTION SOT78 (TO220AB) tab 1 23 LIMITING VALUES Limiting values in accordance with the Absolute [ ... ]

IRF840 PDF Datasheet Download