This part is a kind of semiconductor called AP18T10GH-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. AP18T10GH/J-HF-3 N-channel Enhancement-mode Power MOSFET Simple Drive Requirement Fast Switching Characteristics Low Gate Charge RoHS-compliant, halogen-free G S D BV DSS R DS(ON) ID 100V 160mΩ 9A Description Advanced Power MOSFETs from APEC provide the designer with the best combination of fast switching, low on-resistance and cost-effectiveness. G D S D (tab) TO-252 (H) The AP18T10GH-HF-3 is in the TO-252 package which is widely preferred for commercial and industrial surface mount applications such as medium-power DC/DC converters. The through-hole TO-251 version (AP18T10GJ-HF-3) is available where a small PCB footprint is required. G D S D (tab) TO-251 (J) Absolute Maximum Ratings Symbol VDS VGS ID at TA=25°C ID at TA=100°C IDM PD at TA=25 [ ... ]

AP18T10GH-HF-3 PDF Datasheet Download