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IRFZ44N MOSFET: Datasheet, Application, Equivalent [Video]

Author: Billily Date: 21 Nov 2020  977

irfz44n application


IRFZ44N is a N-channel Power MOSFETs, this blog covers IRFZ44N MOSFET pinout, datasheet, equivalent, features and other information on how to use and where to use this device.





IRFZ44N Pinout

IRFZ44N Circuit

IRFZ44N Applications

IRFZ44N Features

IRFZ44N Advantage

IRFZ44N Package

IRFZ44N Parameters

IRFZ44N Documents

IRFZ44N Product Compliance

IRFZ44N Alternatives

IRFZ44N Equivalents

Where to use IRFZ44N

IRLZ44N and IRFZ44N Difference

How to use IRFZ44N

How to Safely Long Run IRFZ44N in Circuits

IRFZ44N Manufacturer

Component Datasheet


Ordering & Quantity


irfz44n symbol


IRFZ44N Symbol


irfz44n footprint


IRFZ44N Footprint


IRFZ44N Pinout

irfz44n pinout

Pin Number

Pin Name




Current flows out through Source



Controls the biasing of the MOSFET



Current flows in through Drain

IRFZ44N Circuit

  • Switching Time Test Circuit

irfz44n switching time test circuit

  • Unclamped Inductive Test Circuit

irfz44n unclamped Inductive test circuit

  • Gate Charge Test Circuit

irfz44n gate charge test circuit

  • Peak Diode Recovery dv/dt Test Circuit

irfz44n peak diode recovery dv/dt test circuit

IRFZ44N Applications

  • Battery Chargers
  • Battery Management Systems
  • Solar Battery Chargers & Applications
  • Fast Switching Applications
  • Uninterruptible Power Supplies
  • Motor Driver Circuits
  • Solar Uninterruptible Power Supplies

IRFZ44N Features

  • Advanced Process Technology
  • Ultra Low On-Resistance
  • Dynamic dv/dt Rating
  • 175°C Operating Temperature
  • Fast Switching
  • Fully Avalanche Rated
  • Lead-Free

IRFZ44N Advantage

IRFZ44N is a widely used MOSFET transistor designed to use in variety of general purpose applications. The transistor possesses high speed switching capability which makes it ideal to use in applications where high speed switching is a crucial requirement. The transistor is capable to drive load of upto 49A and the max load voltage can be 55V. However the peak pulse current can be upto 160A. The minimum threshold voltage required for this transistor to make it in fully open state is 2V to 4V. This transistor can also be used as an audio amplifier or in audio amplifier stages; it is capable to deliver maximum audio output of 94W.

IRFZ44N Package

  • To-220AB Package Outline

irfz44n package

irfz44n package

irfz44n package

irfz44n package

irfz44n package

irfz44n package

IRFZ44N Parameters


Infineon / IR

Channel Mode




Fall Time

45 ns

Forward Transconductance - Min

19 S


15.65 mm

Id - Continuous Drain Current

49 A


10 mm



Maximum Operating Temperature

+ 175 C

Minimum Operating Temperature

- 55 C

Mounting Style

Through Hole

Number of Channels

1 Channel

Package / Case


Pd - Power Dissipation

94 W

Product Category


Product Type


Rds On - Drain-Source Resistance

17.5 mOhms

Rise Time

60 ns





Transistor Polarity


Transistor Type

1 N-Channel



Typical Turn-Off Delay Time

44 ns

Typical Turn-On Delay Time

12 ns

Unit Weight

0.211644 oz

Vds - Drain-Source Breakdown Voltage

55 V

Vgs - Gate-Source Voltage

- 20 V, + 20 V


4.4 mm

IRFZ44N Documents


End of Life Notification (PDF)


IRFZ44N Symbol & Footprint by SnapEDA

Product Catalogs

Gate Driver Selection Guide 2019 (PDF)

Selection Guide (PDF)

IRFZ44N Product Compliance







IRFZ44N Alternatives

IRF2807, IRFB3207, IRFB4710

IRFZ44N Equivalents

IRFZ46N, STP55N06, 2SK2376, BUK456-60H, STP50N06, 2SK2312, 2SK2376, BUZ 102S, IRF1010A

IRLZ44N and IRFZ44N Difference

The IRLZ44N and IRFZ44N MOSFETs are often confused among each other and used incorrectly. The IRLZ44N is a Logic level Mosfet with a very low gate threshold voltage of 5V, meaning the MOSFET can be fully turned on with just 5V on its gate pin which avoids the need for a driver circuit.



The IRFZ44N on the other hand requires a gate driver circuit if the MOSFET has to be turned on completely using a microcontroller like Arduino. However it does turn on partially with direct 5V form a I/O pin, but the output drain current will be limited.



Where to use IRFZ44N

The IRFZ44N 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 IRLZ44N mosfet.

How to use IRFZ44N

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). IRFZ44N 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.

How to Safely Long Run IRFZ44N in Circuits

To get long term performance with IRFZ44N it is suggested to not use this transistor on its maximum ratings. Using any components on its maximum rating can cause stress on the component and may damage or weak it’s inside circuitry which result in weaker performance. We always suggest use any component atleat 20% below from maximum capacity or specifications. The same rule will be applied for IRFZ44N. The maximum drain current is 49 amperes therefore do not drive load of more than 39 amperes. The maximum load voltage is 55V and for safety do not drive load of more than 44V. The Gate to source voltage should be under ±20V and always store or operate the transistor in temperature above -55 centigrade and below +175 centigrade.

IRFZ44N Manufacturer

Infineon Technologies AG is a world leader in semiconductor solutions that make life easier, safer and greener. Microelectronics from Infineon is the key to a better future. In the 2019 fiscal year (ending 30 September), the company reported sales of around €8 billion with about 41,400 employees worldwide. Infineon is listed on the Frankfurt Stock Exchange (ticker symbol: IFX) and in the USA on the over-the-counter market OTCQX International Premier (ticker symbol: IFNNY).

Component Datasheet

IRFZ44N Datasheet


  • What is irfz44n?

The IRFZ44N is a N-channel MOSFET with a high drain current of 49A and low Rds value of 17.5 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.

  • What are power MOSFETs used for?

Power MOSFETs are widely used in transportation technology, which include a wide range of vehicles. In the automotive industry, power MOSFETs are widely used in automotive electronics. Power MOSFETs (including DMOS, LDMOS and VMOS) are commonly used for a wide range of other applications.

  • How do I use irfz44n?

IRFZ44N 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.

  • How do I turn on a mosfet channel?

N-Channel – For an N-Channel MOSFET, the source is connected to ground. To turn the MOSFET on, we need to raise the voltage on the gate. To turn it off we need to connect the gate to ground. P-Channel – The source is connected to the power rail (Vcc).

  • What to do with irfz44n?

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
IRFZ44NPBF IRFZ44NPBF Company:Infineon Technologies Remark:MOSFET N-CH 55V 49A TO-220AB Package:TO-220AB
In Stock:10612
1+: $1.11000
10+: $0.98900
25+: $0.93920
100+: $0.70430
500+: $0.59702
1000+: $0.48633
2500+: $0.47962
5000+: $0.43602
9000+: $0.41590

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