IRF520N N-Channel MOSFET (100V, 10A)

Description

The IRF520N is a widely used N-Channel Power MOSFET designed for applications that require medium-voltage blocking (100V) and moderate current handling. It is often found in hobbyist projects and cost-sensitive industrial designs.

Key Specifications

• Transistor Type: N-Channel MOSFET

• Drain-Source Voltage ($V_{DS}$): 100 V

• Continuous Drain Current ($I_D$): 9.7 A (typically rounded to 10 A)

• On-Resistance ($R_{DS(on)}$): $0.27 \ \Omega$ (Max)

• Power Dissipation ($P_D$): 60 W

• 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:

1. Gate (G)

2. Drain (D)

3. Source (S)

Comparison: IRF520N vs. IRF530N

While both are 100V MOSFETs, they are tuned for different current requirements.

• Selection Insight: The IRF520N is typically chosen for its affordability and sufficient performance in lower-power switching applications where the higher capacity of the IRF530N or IRF540N is unnecessary.

Common Applications

• Low-Power PWM Motor Control: Frequently used in small-motor speed controllers.

• LED String Switching: Capable of handling moderate-sized LED arrays.

• Solenoid/Relay Drivers: Ideal for switching industrial or automotive small-load coils.

• General Purpose Logic Switching: Used as an electronic switch for various 12V–24V system modules.

Usage Best Practices

• The “Logic-Level” Trap: A common mistake is using the IRF520N directly with a 3.3V or 5V microcontroller pin. While it can turn on, it will have a very high resistance, causing it to overheat and potentially fail. For optimal performance ($0.27 \ \Omega$), always use a 10V gate drive. If you only have 5V available, use a small NPN transistor to boost the gate voltage.

• Heatsinking: Even though the maximum rating is 60W, standard practice is to use a heatsink if the device is dissipating more than a few watts. If the MOSFET feels too hot to touch while operating, it needs a larger heatsink or a more efficient gate drive.

• Inductive Loads: Since this MOSFET is rated for 100V, remember that inductive loads (motors/coils) can create voltage spikes far exceeding 100V when turned off. Always pair this with a flyback diode or an R-C snubber network to protect the device.