This part is a kind of semiconductor called D3N40.

Function of this product has AOD3N40.

Manufacturers : Alpha & Omega Semiconductors

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Some of the text within the PDF file :

AOD3N40 400V,2.6A N-Channel MOSFET General Description Product Summary The AOD3N40 has been fabricated using an advanced high voltage MOSFET process that is designed to deliver high levels of performance and robustness in popular ACDC applications. By providing low RDS(on), Ciss and Crss along with guaranteed avalanche capability this device can be adopted quickly into new and existing offline power supply designs. VDS ID (at VGS=10V) RDS(ON) (at VGS=10V) 100% UIS Tested! 100% Rg Tested! 500V@150℃ 2.6A < 3.1Ω Top View TO252 DPAK Bottom View D D S G G S D G S AOD3N40 Absolute Maximum Ratings TA=25°C unless otherwise noted Parameter Symbol Drain-Source Voltage VDS Gate-Source Voltage Continuous Drain TC=25°C CurrentB TC=100°C Pulsed Drain Current C Pulsed Drain [ ... ]

D3N40 PDF Datasheet Download