This part is a kind of semiconductor called AP9990GH-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. AP9990GH-HF-3 N-channel Enhancement-mode Power MOSFET Low On-resistance Simple Drive Requirement Fast Switching Characteristics RoHS-compliant, halogen-free G S D BV DSS RDS(ON) ID 60V 6mΩ 100A Description Advanced Power MOSFETs from APEC provide the designer with the best combination of fast switching, low on-resistance and cost-effectiveness. The AP9990GH-HF-3 is in the TO-252 package, which is widely used for commercial and industrial surface-mount applications, and is well suited for low voltage applications such as DC/DC converters. G D S D (tab) TO-252 (H) Absolute Maximum Ratings Symbol VDS VGS ID at TC=25°C ID at Tc=25°C ID at Tc=100°C IDM PD at Tc=25°C PD at TA=25°C TSTG TJ Parameter Drain-Source Voltage Gate-Source Voltage Continuou [ ... ]

AP9990GH-HF-3 PDF Datasheet Download