IRFZ44N – N-Channel Power MOSFET (55V, 49A)

Description

Great pick! The IRFZ44N is a powerful N-channel MOSFET — widely used in power electronics, especially in switching power supplies, motor control, and DC-DC converters. It’s known for its high current capacity and low RDS(on).

IRFZ44N – N-Channel Power MOSFET

(TO-220 Package, 55V, 49A)

General Description

The IRFZ44N is an N-channel enhancement-mode power MOSFET designed for high-speed switching applications. It has a very low on-resistance (RDS(on)), high current handling (up to 49A), and is capable of operating at voltages up to 55V. It’s typically used in low-voltage, high-current applications such as power supplies, inverters, H-bridges, and PWM motor drivers.

Key Specifications

Package – TO-220 Pinout

       _______
      |       |
Gate | 1     | Drain (Tab)
Source | 2   |
      | 3     |
      ---------

Key Features

• High-speed switching
• Low gate drive requirements
• Low on-resistance (RDS(on))
• High current capability
• Easily driven by 5V/10V logic (good for Arduino/PWM)
• Rugged TO-220 package

Typical Applications

• Motor drivers (PWM or H-Bridge)
• DC-DC converters (buck/boost)
• Power switching circuits
• Inverters and UPS systems
• Battery management
• Load switches and protection circuits

Example Use Case:

If you’re using it as a low-side switch, here’s how you’d wire it:

• Drain → Negative terminal of the load
• Source → GND
• Gate → Microcontroller / driver pin (with 10Ω resistor)
• Add a pull-down resistor (10kΩ) from Gate to GND to prevent floating gate.

Advantages

• High power handling
• Works well with microcontroller logic (at 10V gate drive)
• Readily available and inexpensive

Cautions

• Needs sufficient gate voltage (preferably 10V for full saturation)
• Gate must be protected from overvoltage (±20V max)
• May require heatsink if switching high current continuously

Quick Comparison

If you’re working with Arduino or 3.3V/5V logic, IRLZ44N might be a better drop-in.

Would you like:

• A MOSFET switching circuit diagram?
• Help with gate driver selection?
• A comparison with IRF540N or IRLZ44N?

Let me know how you’re planning to use the IRFZ44N, and I can give you tailored design tips!