IRFZ44R N-Channel 60V 50A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ44R is an N-Channel MOSFET manufactured by Vishay Siliconix, rated for 60V drain-to-source voltage and 50A continuous drain current in a Through Hole TO-220AB package. This device is classified as Obsolete, which necessitates identification of equivalent and substitute components for ongoing production and maintenance applications. The IRFZ44R remains in stock with 1540 pieces available as new original inventory. Equivalent parts maintain identical or superior electrical performance within the same package form factor, while substitute parts provide functional alternatives with comparable or enhanced specifications.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	50	A (Tc)
On-State Resistance (Rds On) @ 31A, 10V	28	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	67	nC
Input Capacitance (Ciss) @ 25V	1900	pF
Power Dissipation (Max)	150	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	TO-220AB	Through Hole
FET Technology	N-Channel MOSFET	Metal Oxide

Substitute Part Grouping Explanation

Substitution of the IRFZ44R is determined by the following critical parameters: Drain-to-Source Voltage (Vdss), Continuous Drain Current (Id), On-State Resistance (Rds On), Gate Threshold Voltage (Vgs(th)), and package compatibility. All substitute parts listed maintain a minimum Vdss of 60V and Id rating of 35A or greater, ensuring electrical compatibility in applications designed for the IRFZ44R. Packaging remains TO-220-3 or TO-220AB form factor to support direct mechanical mounting. Gate charge, input capacitance, and power dissipation characteristics are secondary parameters that influence switching performance and thermal management but do not prevent functional substitution when primary ratings are met.

Substitute parts are grouped into two categories: Parametric Equivalents (identical electrical specifications) and Manufacturer Recommended Substitutes (enhanced or alternative specifications within compatible operating ranges).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Vgs(th) (V)	Qg (nC)	Ciss (pF)	Pd Max (W)	Package	Status
IRFZ44R	Vishay Siliconix	60	50	28 @ 31A	4 @ 250µA	67 @ 10V	1900 @ 25V	150	TO-220AB	Obsolete
IRFZ40PBF	Vishay Siliconix	60	50	28 @ 31A	4 @ 250µA	67 @ 10V	1900 @ 25V	150	TO-220AB	Active
IRFZ44PBF	Vishay Siliconix	60	50	28 @ 31A	4 @ 250µA	67 @ 10V	1900 @ 25V	150	TO-220AB	Active
IRFZ44RPBF	Vishay Siliconix	60	50	28 @ 31A	4 @ 250µA	67 @ 10V	1900 @ 25V	150	TO-220AB	Active
FDP55N06	onsemi	60	55	22 @ 27.5A	4 @ 250µA	37 @ 10V	1510 @ 25V	114	TO-220-3	Obsolete
HUF76423P3	onsemi	60	35	30 @ 35A	3 @ 250µA	34 @ 10V	1060 @ 25V	85	TO-220-3	Active
IRFB3806PBF	Infineon Technologies	60	43	15.8 @ 25A	4 @ 50µA	30 @ 10V	1150 @ 50V	71	TO-220AB	Active
IRFZ44EPBF	Infineon Technologies	60	48	23 @ 29A	4 @ 250µA	60 @ 10V	1360 @ 25V	110	TO-220AB	Not For New Designs
IRFZ44NPBF	Infineon Technologies	55	49	17.5 @ 25A	4 @ 250µA	63 @ 10V	1470 @ 25V	94	TO-220AB	Active
IRFZ44VZPBF	Infineon Technologies	60	57	12 @ 34A	4 @ 250µA	65 @ 10V	1690 @ 25V	92	TO-220AB	Not For New Designs
NDP6060	onsemi	60	48	25 @ 24A	4 @ 250µA	70 @ 10V	1800 @ 25V	100	TO-220-3	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement)

IRFZ40PBF, IRFZ44PBF, and IRFZ44RPBF are parametric equivalents to the IRFZ44R, maintaining identical electrical specifications across all critical parameters. These parts are manufactured by Vishay Siliconix and are classified as Active products, ensuring long-term availability and supply chain stability. IRFZ40PBF and IRFZ44RPBF carry ROHS3 compliance certification, while IRFZ44PBF also meets ROHS3 requirements. All three equivalents are packaged in Tube format and support direct pin-for-pin substitution in TO-220AB applications.

Manufacturer Recommended Substitutes (Enhanced Performance)

IRFZ44NPBF (Infineon Technologies, Active status) provides a 60V/49A alternative with improved on-state resistance of 17.5 mOhm at 25A, reducing conduction losses compared to the IRFZ44R. This part operates across the full -55°C to 175°C temperature range and carries ROHS3 compliance. The reduced Vdss rating of 55V remains suitable for 60V-class applications with appropriate design margin.

IRFZ44VZPBF (Infineon Technologies, Not For New Designs) delivers enhanced current handling at 57A with superior on-state resistance of 12 mOhm at 34A. This part maintains 60V Vdss rating and full temperature range operation but is designated Not For New Designs, limiting its suitability for new product development.

IRFB3806PBF (Infineon Technologies, Active status) offers the lowest on-state resistance at 15.8 mOhm at 25A with 43A continuous current rating. This part is suitable for applications where conduction loss minimization is critical, though the reduced current rating of 43A may limit applicability in high-current designs.

NDP6060 (onsemi, Active status) provides 60V/48A performance with 25 mOhm on-state resistance and 100W power dissipation. This part is actively manufactured and carries ROHS3 compliance, supporting long-term design continuity.

Substitutes with Reduced Current Rating

HUF76423P3 (onsemi, Active status, UltraFET™ series) operates at 60V/35A with 30 mOhm on-state resistance. This part is suitable only for applications where the 35A continuous current rating meets design requirements. The reduced power dissipation of 85W indicates lower thermal performance compared to the IRFZ44R.

Obsolete Alternatives

FDP55N06 (onsemi, Obsolete status) is not recommended for new designs due to discontinued product status, despite offering 60V/55A performance with 22 mOhm on-state resistance.

Frequently Asked Questions (FAQ)

Q: Can IRFZ40PBF directly replace IRFZ44R in existing designs?

A: Yes. IRFZ40PBF is a parametric equivalent with identical Vdss (60V), Id (50A), Rds On (28 mOhm), and all other critical electrical specifications. The TO-220AB package supports direct pin-for-pin substitution. IRFZ40PBF is Active status with ROHS3 compliance, providing improved supply chain availability compared to the Obsolete IRFZ44R.

Q: What is the difference between IRFZ44PBF and IRFZ44RPBF?

A: Both parts are parametric equivalents to IRFZ44R with identical electrical specifications. The primary difference is packaging format: IRFZ44PBF and IRFZ44RPBF are supplied in Tube packaging. Both maintain Active product status and ROHS3 compliance. Selection between these parts depends on procurement and inventory management requirements.

Q: Is IRFZ44NPBF suitable as a substitute despite the 55V Vdss rating?

A: IRFZ44NPBF operates at 55V Vdss compared to the IRFZ44R's 60V rating. This part is suitable for applications where the design voltage margin accommodates the reduced Vdss specification. The improved on-state resistance of 17.5 mOhm at 25A provides superior conduction performance. IRFZ44NPBF is Active status with full -55°C to 175°C temperature range and ROHS3 compliance, supporting long-term production use.

Q: Why is IRFZ44VZPBF marked as Not For New Designs?

A: IRFZ44VZPBF carries a Not For New Designs designation, indicating that Infineon Technologies does not recommend this part for new product development. While the part offers enhanced current handling (57A) and superior on-state resistance (12 mOhm), the product status restricts its use to legacy system maintenance and repair applications only.

Q: Can HUF76423P3 replace IRFZ44R in high-current applications?

A: HUF76423P3 is rated for 35A continuous drain current, which is below the IRFZ44R's 50A rating. This part is suitable only for applications where the design current requirement does not exceed 35A. The 60V Vdss rating and TO-220-3 package provide mechanical compatibility, but the reduced current capacity limits applicability in designs requiring the full 50A performance of the IRFZ44R.

Q: What compliance certifications should I verify for substitute parts?

A: All recommended substitute parts carry ROHS3 compliance certification and REACH Unaffected status, meeting current environmental and regulatory requirements. Verify that the selected substitute part's compliance status aligns with your application's regulatory requirements before final design approval.

Q: Are there package compatibility considerations when substituting TO-220AB with TO-220-3?

A: TO-220AB and TO-220-3 packages are mechanically compatible in standard TO-220 mounting applications. Both packages feature three leads (Gate, Drain, Source) with identical pin assignments. Thermal performance may vary due to differences in lead frame design and power dissipation ratings. Verify thermal management requirements for your specific application when transitioning between package variants.

Q: Which substitute part offers the best on-state resistance performance?

A: IRFZ44VZPBF provides the lowest on-state resistance at 12 mOhm at 34A, followed by IRFB3806PBF at 15.8 mOhm at 25A. However, IRFZ44VZPBF is designated Not For New Designs, limiting its use to maintenance applications. For new designs, IRFB3806PBF offers the best on-state resistance performance among Active-status parts, though its 43A current rating is lower than the IRFZ44R's 50A specification.

Q: What is the minimum Vdss rating acceptable for IRFZ44R substitution?

A: The IRFZ44R operates at 60V Vdss. Substitute parts with 60V Vdss provide direct voltage compatibility. IRFZ44NPBF operates at 55V Vdss and is suitable for applications where the design voltage margin accommodates the reduced specification. Parts rated below 55V Vdss are not recommended as substitutes for the IRFZ44R.

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