This part is a kind of semiconductor called AP9990GP-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. AP9990GP-HF-3 N-channel Enhancement-mode Power MOSFET Simple Drive Requirement Low On-resistance Fast Switching Performance 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 AP9990GP-HF-3 is in the TO-220 package, which is widely used for commercial and industrial applications, and is well-suited for low voltage applications such as DC/DC converters and motor drives. The TO-220 through-hole package is often used where a small PCB footprint or an attached heatsink is required. G D TO-220 (P) S Absolute Maximum Ratings Symbol VDS VGS ID at TC=25°C ID at TC=100°C ID at TC=25°C [ ... ]

AP9990GP-HF-3 PDF Datasheet Download