Description
The IRFP460 is a high-voltage, high-current N-Channel Power MOSFET. Unlike the bipolar junction transistors (BJTs) previously discussed, this is a field-effect device, meaning it is voltage-controlled rather than current-controlled. It is designed specifically for high-power switching applications such as DC-DC converters, motor controllers, and high-voltage power supplies.
Key Specifications
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Transistor Type: N-Channel MOSFET
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Drain-Source Voltage ($V_{DS}$): 500 V
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Drain Current ($I_D$): 20 A (at $25^{\circ}\text{C}$)
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On-Resistance ($R_{DS(on)}$): $0.27 \ \Omega$ (Max)
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Power Dissipation ($P_D$): 280 W
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Package Type: TO-247 (a larger, more robust package than the TO-220)
Pinout Configuration
When looking at the front of the TO-247 package with the metal tab at the top and 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)
MOSFET vs. BJT: Key Differences
Because the IRFP460 is a MOSFET, it behaves very differently from the TIP or BC series transistors:
| Feature | BJT (e.g., TIP41C) | MOSFET (e.g., IRFP460) |
| Control | Current-driven ($I_B$) | Voltage-driven ($V_{GS}$) |
| Input Impedance | Low | Extremely High |
| Efficiency | Generally lower at high power | Higher due to low $R_{DS(on)}$ |
| Switching Speed | Moderate | Very Fast |
Common Applications
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Switch Mode Power Supplies (SMPS): Its high voltage rating makes it ideal for primary-side switching in mains-powered circuits.
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Motor Control: Used in H-bridges or PWM controllers for high-voltage DC motors.
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Induction Heating: Frequently found in high-frequency induction heating circuits due to its fast switching capabilities.
Critical Usage Considerations
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Gate Drive Requirements: Although MOSFETs are “voltage-controlled,” the gate behaves like a small capacitor. To switch the IRFP460 quickly (especially at high frequencies), you must provide a gate driver circuit capable of sourcing/sinking enough current to charge and discharge this gate capacitance rapidly.
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Thermal Management: With a power dissipation rating of 280W, a substantial heatsink is mandatory for high-current applications. Always use thermal compound and insulating hardware if the heatsink must remain electrically isolated.
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ESD Sensitivity: Like all MOSFETs, the IRFP460 is sensitive to Electrostatic Discharge (ESD). Handle with care, and ensure the gate is protected against static buildup.
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Voltage Spikes: Since it operates at up to 500V, any inductive flyback can easily exceed the device’s limits. Use robust snubber circuits and transient voltage suppressors (TVS diodes) to protect the drain-source junction.
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