The IRFZ44 is a N-channel MOSFET with a high drain current of 55A and low Rds value of 16.5 mΩ. It also has a low threshold voltage of 4V at which the MOSFET will start conducting. Hence it is commonly used with microcontrollers to drive with 5V. However a driver circuit is needed if the MOSFET has to be switched in completely.
IRFZ44N Pinout Configuration
| Pin Number | Pin Name | Description |
| 1 | Gate | Controls the biasing of the MOSFET |
| 2 | Drain | Current flows in through Drain |
| 3 | Source | Current flows out through Source |
Features and Specifications
- Small signal N-Channel MOSFET
- Continuous Drain Current (ID) is 55A at 25°C
- Pulsed Drain Current (ID-peak) is 220A
- Minimum Gate threshold voltage (VGS-th) is 2V
- Maximum Gate threshold voltage (VGS-th) is 4V
- Gate-Source Voltage is (VGS) is ±20V (max)
- Maximum Drain-Source Voltage (VDS) is 60V
- Rise time and fall time is about 97ns and 57ns respectively.
- It is commonly used with Arduino, due to its low threshold current.
- Available in To-220 package
Note: Complete Technical Details can be found in the IRFZ44 datasheet given at the end of this page.
Where to use IRFZ44 MOSFET
The IRFZ44 is known for its high drain current and fast switching speed. Adding to that it also has a low Rds value which will help in increasing the efficiency of switching circuits. The MOSFET will start turning on with a small gate voltage of 4V, but the drain current will be maximum only when a gate voltage of 10V is applied. If the mosfet has to be driven directly from a microcontroller like Arduino then try the logic level version IRLZ44 mosfet.
How to use IRFZ44 MOSFET
Unlike transistors MOSFET’s are voltage controlled devices. Meaning, they can be turned on or turned off by supplying the required Gate threshold voltage (VGS). IRFZ44 is an N-channel MOSFET, so the Drain and Source pins will be left open when there is no voltage applied to the gate pin. When a gate voltage is applied these pins gets closed.
If it is required to be switched with Arduino, then a simple drive circuit using a transistor will work to provide the required gate voltage to trigger the MOSFET to open fully. For other switching and amplifying applications, a dedicated MOFET Driver IC is required.
IRFZ44 with 5V gate (Arduino)
If the MOSFET gate pin is directly connected to an I/O pin of a microcontroller like Arduino, PIC, etc. Then it will not open completely and the maximum drain current will depend on the voltage applied to the gate pin. The below graph shows how much drain current is permitted for gate threshold voltage from 4V to 10V.
As you can see the MOSFET opens completely only when the gate voltage is around 10V. If it is somewhere around 5V then the drain current is limited to 20A and so on.
Applications
- Switching high power devices
- Control speed of motors
- LED dimmers or flashers
- High Speed switching applications
- Converters or Inverter circuits
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