IRLZ44N NChannel LogicLevel Power MOSFET
= High-Current 55V MOSFET for Switching Applications =
The IRLZ44N is a popular Nchannel Power MOSFET designed for highcurrent switching applications. Its logic-level gate drive allows direct control from microcontrollers like Arduino, making it a favorite for DIY and professional projects .
LogicLevel Compatible Directly driven by 3.3V or 5V logic circuits
High Current Capability - Handles up to 47A continuous current
Maximum Drain-Source Voltage (Vdss) is 55V
Keep gatesource voltage (Vgs) between 20V and +20V for safe operation
Use a gate resistor and pulldown to prevent accidental turnon
= Technical Specifications =
| Parameter | Value |
|---|
| Drain-Source Voltage (Vdss) | 55V |
| Continuous Drain Current (Id) | 47A |
| On-Resistance (RDS(on)) | 0.022Ω |
| Gate Threshold Voltage | 2V |
| Input Capacitance (Ciss) | 1700pF |
| Package | TO-220 |
| Technology | N-Channel MOSFET |
= Key Features =
LogicLevel Gate Drive Turns on fully with 5V or 3.3V logic signals, ideal for microcontrollers
Low OnResistance 22mΩ ensures high efficiency with minimal heat generation
Avalanche Rated Builtin robustness against voltage spikes, enhancing reliability
Fast Switching Suitable for highfrequency PWM applications like motor control
== Applications ==
- DC-DC converters and power supplies
- DC motor speed control (robotics, drones)
- Solidstate relays and highpower switching
- LED and lighting PWM dimming
- Battery management and load switching
A Powerhouse MOSFET A top choice for highpower, logic-controlled circuits
Versatile and Robust - Excellent balance of current, voltage, and easy driving capabilities
√ Widely available in the TO-220 package for easy breadboard and heatsink mounting
√ Directly compatible with 5V Arduino and 3.3V ESP boards
√ Multiple manufacturers offer this part (Infineon, UMW, ISC)
= Connection Guide =
Pinout (TO-220 package, face up):
- Pin 1 (Gate): Control signal (logic-level voltage)
- Pin 2 (Drain): Main current path (connect to load)
- Pin 3 (Source): Current return path and common ground
In a typical high-side switch, the load connects between the positive supply and the Drain.
For microcontrollers, a 100Ω to 330Ω gate resistor is recommended to reduce ringing.
The TO-220 metal tab is internally connected to the Drain (pin 2). Ensure proper insulation if mounting to a grounded heatsink.
= Troubleshooting =
MOSFET not switching on:
- Check Gate voltage is above 2V (ensure at least 4.5V for full conduction)
- Verify Gate is not left floating (use a 10kΩ pull-down resistor)
- Ensure Source and Microcontroller ground are common
Excessive heating:
- Reduce switching frequency
- Ensure Gate voltage is high enough (5V or 10V) to achieve the 22mΩ on-resistance
- Check for insufficient heatsinking
