Description
The IRF630N is a robust N-Channel Power MOSFET designed for high-voltage switching applications. It is part of the “IRF630” family, offering improved efficiency and faster switching characteristics compared to the original standard IRF630.
Key Specifications
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Transistor Type: N-Channel MOSFET
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Drain-Source Voltage ($V_{DS}$): 200 V
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Continuous Drain Current ($I_D$): 9 A (at $25^{\circ}\text{C}$)
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On-Resistance ($R_{DS(on)}$): $0.3 \ \Omega$ (Max)
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Power Dissipation ($P_D$): 74 W
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Package Type: TO-220
Pinout Configuration
When looking at the front of the TO-220 package (the metal tab is at the top) with the pins pointing down, the pins from left to right are:
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Gate (G)
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Drain (D)
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Source (S)
Comparison: IRF630N vs. IRF640N
Both are 200V MOSFETs in the TO-220 package, but they are sized for different current requirements.
| Feature | IRF630N | IRF640N |
| Max Current ($I_D$) | 9 A | 18 A |
| $R_{DS(on)}$ | $0.3 \ \Omega$ | $0.15 \ \Omega$ |
| Power Dissipation | 74 W | 140 W |
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Selection Insight: The IRF630N is typically chosen for smaller, more cost-sensitive applications where the 18A capacity of the IRF640N is not needed.
Common Applications
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DC-DC Converters: Useful in low-to-medium power switching power supplies.
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Motor Drivers: Suitable for small-to-medium DC motor controllers where the supply voltage is up to 200V.
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Voltage Regulation: Frequently used in high-voltage linear regulators or as an electronic switch for industrial control loops.
Usage Best Practices
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Gate Drive: To ensure the device operates at its rated $0.3 \ \Omega$ resistance, provide a gate voltage ($V_{GS}$) of at least 10V. Driving it directly from a 3.3V or 5V microcontroller without a level shifter or driver IC will cause the MOSFET to operate in the linear region, leading to significant heat buildup.
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Thermal Management: Even at 9A, the device can dissipate significant power. Always mount the device on a heatsink with thermal compound.
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Protection: Because it is designed for 200V, ensure that any inductive load (motors, relays, or transformers) is protected by a flyback diode or a snubber circuit to prevent Back-EMF from exceeding the $V_{DS}$ limit and causing a breakdown.
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