This part is a kind of semiconductor called AP9990GMT-HF-3.

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. AP9990GMT-HF-3 N-channel Enhancement-mode Power MOSFET Simple Drive Requirement SO-8 Compatible with Heatsink Low On-resistance RoHS-compliant, halogen-free G S D BV DSS R DS(ON) ID D 60V 5mΩ 84A Description Advanced Power MOSFETs from APEC provide the designer with the best combination of fast switching, ruggedized device design, low on-resistance and cost-effectiveness. The PMPAK®5x6 package is specially designed for DC-DC converter applications, with a foot print that is compatible with the popular SO-8 and offers a backside heat sink and lower package profile. S S D D D S G PMPAK®5x6 Absolute Maximum Ratings Symbol VDS VGS ID at TC=25°C ID at TA=25°C ID at TA=70°C IDM PD at TC=25°C PD at TA=25°C EAS TSTG TJ Parameter Drain-Source Vo [ ... ]

AP9990GMT-HF-3 PDF Datasheet Download