This part is a kind of semiconductor called 40N25.

Function of this product has FQA40N25.

Manufacturers : Fairchild Semiconductor

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FQA40N25 N-Channel QFET® MOSFET April 2014 FQA40N25 N-Channel QFET® MOSFET 250 V, 40 A, 70 mΩ Description This N-Channel enhancement mode power MOSFET is produced using Fairchild Semiconductor’s proprietary planar stripe and DMOS technology. This advanced MOSFET technology has been especially tailored to reduce on-state resistance, and to provide superior switching performance and high avalanche energy strength. These devices are suitable for switched mode power supplies, active power factor correction (PFC), and electronic lamp ballasts. Features • 40 A, 250 V, RDS(on) = 70 mΩ (Max.) @ VGS = 10 V, ID = 20 A • Low Gate Charge ( Typ. 85nC) • Low Crss ( Typ. 70pF) • 100% Avalanche Tested D G G D S TO-3PN S Absolute Maximum Ratings T  +
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40N25 PDF Datasheet Download