This part is a kind of semiconductor called AP4028GEMT-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 :
Advanced Power Electronics Corp. AP4028GEMT-HF Halogen-Free Product N-CHANNEL ENHANCEMENT MODE POWER MOSFET ▼ Simple Drive Requirement ▼ SO-8 Compatible with Heatsink D ▼ Low On-resistance ▼ RoHS Compliant & Halogen-Free G Description S AP4028 series are from Advanced Power innovated design and silicon process technology to achieve the lowest possible onresistance and fast switching performance. It provides the designer with an extreme efficient device for use in a wide range of power applications. The PMPAK ® 5x6 package is special for DC-DC converters application and the foot print is compatible with SO-8 with backside heat sink and lower profile. BVDSS RDS(ON) ID 30V 9mΩ 41.6A D D D D S S S G PMPAK® 5x6 Absolute Maximum Ratings@Tj=25o.C(unless otherwise specified [ ... ]