This post explains for the semiconductor Power MOSFET.
The Part Number is IRC630. The Package is TO-220 Type
The function of this semiconductor is HEXFET Power MOSFET.
Manufacturers : International Rectifier
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Third Generation HEXFETs from international Rectifier provide the desinger with the best combination of fast switching, reggedized device design, low on-resistance and cost-effeciveness. The HEXSense device provides an accurate fraction of the drain current through the additional two leads to be used of control or protection of the device.
1. Dynamic dv/dt Rating 2. Repetitive Avalanche Rated 3. Current Sense 4. Fast Switching 5. Ease of Paralleling 6. Simple Drive Requirements