What is the main function of this part?

This part is used in electronic circuits for signal control, power management, industrial equipment, consumer electronics, and related applications.

Is the datasheet available for this product?

Yes, you can check the datasheet link on this product page or contact our sales team for technical documents.

Can I request a quotation for bulk quantity?

Yes, you can submit the RFQ form on this page. Our sales team will reply with current stock, price, lead time, and delivery information.

What is the difference between IRFZ44N and IRLZ44N for Arduino?

IRFZ44N = standard (needs 10V). IRLZ44N = logic-level (works at 5V).

Why does IRFZ44NPBF overheat with a small motor?

Insufficient gate drive. Use logic-level FET or gate driver.

How to tell genuine from counterfeit?

Genuine ≤ 20mΩ. Counterfeit 38mΩ+.

IRLZ44NPBF, STP55NF06L, IRF3205PBF.

Yes above 3A. 62°C/W = 434°C rise at 7W.

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Home > Products > Discrete Semiconductor Products > Transistors > Power MOSFETs > N-Channel MOSFETs > IRFZ44NPBF

Infineon Technologies IRFZ44NPBF

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Part No.:: IRFZ44NPBF

Manufacturer:: Infineon Technologies

Category:: N-Channel MOSFETs

Package:: TO-220

Description:: MOSFET N-CH 55V 49A D2PAK

Quantity:: Add To Cart Add To RFQ list

Unit Price:$0

Ext Price:$0

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IRFZ44NPBF Information

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Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: HEXFET®

Package/Case:: TO-220

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 49A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 44mOhm @ 16A, 10V

Vgs(th) (Max) @ Id:: 4V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 63 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 1960 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 94W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:

Supplier Device Package:: D2PAK

IRFZ44NPBF Datasheet, Price, Alternatives & FAQ - ICMASS

IRFZ44NPBF - 55V/49A N-Channel HEXFET MOSFET from Infineon

The IRFZ44NPBF is an N-Channel power MOSFET from Infineon's HEXFET family in a TO-220AB package. 55V drain-source, 49A continuous drain current, 17.5mΩ max R_DS(on) at 10V gate drive. Standard threshold (2V–4V) - needs 10V gate drive.

There is a near-identical part with a one-letter difference: the IRLZ44NPBF. The "L" stands for Logic-Level. If you are driving this from an Arduino or microcontroller pin, you want the IRLZ44NPBF instead. This is the most common MOSFET selection mistake on forums.

What Is IRFZ44NPBF and How Does It Work?

It is a standard N-Channel enhancement-mode MOSFET. Apply 10V between gate and source, and the channel conducts between drain and source. The "N" indicates the newer HEXFET generation. The "PBF" suffix means lead-free (RoHS).

Critical: The gate threshold is 2V–4V, but R_DS(on) is only guaranteed at V_GS=10V. The threshold is where it starts conducting, not where it is fully on. This is extensively documented on Arduino Forum and StackExchange.

What Are the Specifications of IRFZ44NPBF?

Parameter	Value	Notes
V_dss	55 V	For 12V–24V systems
I_d @ 25°C	49 A	-
I_d @ 100°C	35 A	Real-world limit
R_DS(on) @ 10V	17.5 mΩ (max)	Guaranteed at 10V only
V_gs(th)	2.0V – 4.0V	Standard threshold
Q_g	63 nC (typ)	Needs gate driver
P_d	94 W	Heatsink required
T_j max	175°C	-
Avalanche Rated	Yes	EAS 9.4mJ
Package	TO-220AB	Tab = drain

IRFZ44NPBF vs IRLZ44NPBF - The Critical Difference

Parameter	IRFZ44NPBF	IRLZ44NPBF
Gate Type	Standard	Logic-Level
V_gs(th)	2V – 4V	1V – 2V
R_DS(on) @ 10V	17.5mΩ	22mΩ
R_DS(on) @ 5V	Not specified	~25mΩ typ
Direct MCU drive	❌ Needs gate driver	✅ 5V compatible

What Is IRFZ44NPBF Used For?

Motor drive (12V–24V): 55V rating gives margin for inductive spikes. 17.5mΩ means 1.75W at 10A. Needs gate driver.

DC-DC converters: 20–100kHz switching. 63nC Qg allows moderate speed with gate driver.

Battery charger switching: For 12V and 24V chargers. Avalanche rated for inductive transients.

High-current load switching: Relay replacement, disconnect switches for 10–30A loads.

What Are the Alternatives to IRFZ44NPBF?

Part	V_ds	I_d	R_DS(on)	Gate Type	Notes
IRFZ44NPBF	55V	49A	17.5mΩ	Standard	Reference
IRLZ44NPBF	55V	47A	22mΩ	Logic	Use for MCU drive
IRF3205PBF	55V	110A	8mΩ	Standard	Higher current
STP55NF06L	60V	55A	14mΩ	Logic-Level	Upgrade

How to Verify Genuine IRFZ44NPBF?

R_DS(on) test: Apply 10V to gate, 10A through drain-source. Should be ≤ 20mΩ. Counterfeits measured at 38mΩ+.

V_gs(th) test: 2.0V–4.0V at 250µA. Below 2.0V suggests IRLZ44N mislabeled.

Frequently Asked Questions About IRFZ44NPBF

Q1: "IRFZ44N vs IRLZ44N for use with Arduino" - what is the difference?

A: This is the most asked question on the Arduino Forum. IRFZ44NPBF (no "L") needs 10V gate drive. IRLZ44NPBF (with "L") is logic-level, works at 5V. If driving from Arduino 5V GPIO, use IRLZ44NPBF.

Q2: "Can IRFZ44NPBF be used with Arduino PWM?"

A: No. It needs 10V gate drive. At 5V, R_DS(on) is several times higher, causing overheating. Use IRLZ44NPBF for Arduino PWM.

Q3: "Single MOSFET can't handle Lego Medium Motor" - why does it overheat?

A: A StackExchange user reported this exact problem. Root cause: insufficient gate drive left MOSFET partially on. Even 1–2A through a partially-on MOSFET generates enough heat to fail. Fix: use IRLZ44N (logic-level) or add gate driver. Always add a flyback diode across the motor.

Q4: How to tell genuine IRFZ44NPBF from counterfeit?

A: Chinese analysis found counterfeits with R_DS(on) over 38mΩ instead of 17.5mΩ (>2×). They also have thicker die and higher thermal resistance. Test: 10V gate, 10A drain-source. Genuine ≤ 20mΩ.

Q5: Can Chinese alternatives replace original Infineon IRFZ44NPBF?

A: Testing found domestic alternatives have higher R_DS(on), thicker die, and higher thermal resistance. For reliability, use original Infineon from authorized channels.

Q6: What are the direct replacements?

A: IRLZ44NPBF (logic-level), IRFZ44N (same specs), STP55NF06L (60V/55A/14mΩ upgrade), IRF3205PBF (110A/8mΩ upgrade).

Q7: Does IRFZ44NPBF need a heatsink?

A: Yes above 3A. At 20A through 17.5mΩ = 7W. Without heatsink (62°C/W) = 434°C rise - destructive. Clip-on heatsink minimum.

Q8: Is IRFZ44NPBF suitable for 24V or 48V systems?

A: 55V gives 2.3× over 24V - good. For 48V, use IRF540NPBF (100V).

Q9: Is IRFZ44NPBF avalanche rated?

A: Yes, EAS 9.4mJ at 25A. Safe for inductive switching.

Q10: What is the max switching frequency?

A: 20–100kHz with gate driver. Limited by 63nC Qg and 1470pF Ciss.

Pricing & Availability

Quantity	Price per unit (USD)
1+	$0.75
50+	$0.38
500+	$0.22
1000+	$0.18
5000+	$0.13

Stock: 84,740 units at LCSC. Ships within 3-5 business days.

Image
Part Number	IRFZ44NPBF
Manufacturer	Infineon Technologies
Series	HEXFET®
Package/Case	TO-220
Packaging	Tube
Product Status	Discontinued at Digi-Key
FET Type	N-Channel
Technology	MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss)	55 V
Current - Continuous Drain (Id) @ 25°C	49A (Tc)
Drive Voltage (Max Rds On, Min Rds On)	10V
Rds On (Max) @ Id, Vgs	44mOhm @ 16A, 10V
Vgs(th) (Max) @ Id	4V @ 250µA
Gate Charge (Qg) (Max) @ Vgs	63 nC @ 10 V
Vgs (Max)	±20V
Input Capacitance (Ciss) (Max) @ Vds	1960 pF @ 25 V
FET Feature	-
Power Dissipation (Max)	94W (Tc)
Operating Temperature	-55°C ~ 175°C (TJ)
Grade	-
Qualification	-
Mounting Type
Supplier Device Package	D2PAK

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