This part is a kind of semiconductor called AP3988P-HF.

Function of this product has N-CHANNEL ENHANCEMENT MODE POWER MOSFET.

Manufacturers : Advanced Power Electronics

Image and pinout :

Some of the text within the PDF file :

AP3988P-HF Halogen-Free Product Advanced Power Electronics Corp. ▼ 100% Avalanche Test ▼ Fast Switching Characteristic ▼ Simple Drive Requirement ▼ RoHS Compliant & Halogen-Free G N-CHANNEL ENHANCEMENT MODE POWER MOSFET D BVDSS RDS(ON) ID 600V 0.75Ω 10A S Description AP3988 series are specially designed as main switching devices for universal 90~265VAC off-line AC/DC converter applications. It provide high blocking voltage to overcome voltage surge and sag in the toughest power system with the best combination of fast switching design and cost-effectiveness. The TO-220 package is widely preferred for commercial-industrial applications. The device is suited for switch mode power supplies, DC-AC converters and high current high speed switching circuits. G D S TO-220(P) Abso [ ... ]

AP3988P-HF PDF Datasheet Download