IRFZ44VPBF N-Channel 60V 55A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ44VPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 60V drain-to-source voltage and 55A continuous drain current in the TO-220AB package. This device belongs to the HEXFET® series and is classified as "Not For New Designs," indicating it has been superseded in Infineon's product portfolio. Due to this obsolescence status, equivalent and substitute parts from active product lines are necessary for ongoing production support and new design alternatives. The IRFZ44VPBF remains available with 20,534 pieces in current inventory.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	55	A
On-State Resistance (Rds On) @ 31A, 10V	16.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	67	nC
Power Dissipation (Max)	115	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220AB	-
Mounting Type	Through Hole	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the IRFZ44VPBF is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must be ≥60V
Continuous Drain Current (Id): Must be ≥55A at 25°C
Gate Threshold Voltage (Vgs(th)): Must be ≤4V @ specified test current
Package Type: TO-220AB or TO-220-3 (mechanically compatible)
Mounting Type: Through Hole
Operating Temperature Range: Must support -55°C to 175°C minimum

Secondary Compatibility Parameters:

On-State Resistance (Rds On): Lower values indicate improved performance
Gate Charge (Qg): Lower values reduce switching losses
Power Dissipation: Higher ratings provide thermal margin
RoHS Compliance: ROHS3 Compliant required

Substitute parts are grouped into three categories based on current rating and performance characteristics:

Category A - Direct Equivalents (55A nominal): Parts with 50-60A continuous drain current, matching the original 55A specification within acceptable tolerance.

Category B - Higher Performance (60-75A): Parts with increased current ratings providing enhanced thermal and electrical margin while maintaining 60V Vdss rating.

Category C - High Current Alternatives (100A): Parts with significantly higher current ratings for applications requiring additional design margin, though with different electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Pd Max (W)	Package	Status
IRFZ44VPBF	Infineon	60	55	16.5 @ 31A	67 @ 10V	115	TO-220AB	Not For New Designs
IRF1010EZPBF	Infineon	60	75	8.5 @ 51A	86 @ 10V	140	TO-220AB	Active
IRFB3806PBF	Infineon	60	43	15.8 @ 25A	30 @ 10V	71	TO-220AB	Active
FDP55N06	onsemi	60	55	22 @ 27.5A	37 @ 10V	114	TO-220-3	Obsolete
HUF75332P3	onsemi	55	60	19 @ 60A	85 @ 20V	145	TO-220-3	Active
IRFZ44PBF	Vishay Siliconix	60	50	28 @ 31A	67 @ 10V	150	TO-220AB	Active
IRFZ44RPBF	Vishay Siliconix	60	50	28 @ 31A	67 @ 10V	150	TO-220AB	Active
PSMN3R0-60PS,127	Nexperia USA Inc.	60	100	3 @ 25A	130 @ 10V	306	TO-220AB	Obsolete
PSMN4R6-60PS,127	Nexperia USA Inc.	60	100	4.6 @ 25A	70.8 @ 10V	211	TO-220AB	Obsolete
STP45NF06	STMicroelectronics	60	38	28 @ 19A	58 @ 10V	80	TO-220	Active
STP55NF06	STMicroelectronics	60	50	18 @ 27.5A	60 @ 10V	110	TO-220	Active

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

The IRF1010EZPBF from Infineon Technologies is the preferred substitute for new designs. It maintains the same 60V Vdss rating and TO-220AB package as the IRFZ44VPBF while offering higher continuous drain current (75A), lower on-state resistance (8.5 mOhm), and increased power dissipation capability (140W). This part carries Active product status and full ROHS3 compliance.

The STP55NF06 from STMicroelectronics provides an alternative from a different manufacturer with equivalent 60V/50A specifications. It features improved on-state resistance (18 mOhm) compared to the original part and maintains Active product status with ROHS3 compliance. The TO-220 package is mechanically compatible with TO-220AB applications.

Secondary Substitutes (Active Status):

The IRFZ44PBF and IRFZ44RPBF from Vishay Siliconix are functionally equivalent alternatives with 50A continuous drain current and TO-220AB packaging. Both maintain Active product status and ROHS3 compliance. These parts are suitable for applications where the 55A specification can tolerate a 50A rating.

The HUF75332P3 from onsemi offers higher current capability (60A) with Active product status. Note that this part has a 55V Vdss rating, which is 5V lower than the original specification. This substitution is valid only for applications where the reduced voltage margin is acceptable.

Obsolete Alternatives (Not Recommended for New Designs):

The FDP55N06 (onsemi), PSMN3R0-60PS,127, and PSMN4R6-60PS,127 (Nexperia) are classified as Obsolete. While these parts may be available in inventory, they should not be selected for new designs due to their discontinued status.

Not Recommended:

The IRFB3806PBF has a continuous drain current rating of 43A, which falls below the 55A requirement of the original part and does not meet the substitution criteria.

The STP45NF06 has a continuous drain current rating of 38A, which is insufficient for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the IRF1010EZPBF directly replace the IRFZ44VPBF in existing designs?

A: Yes. The IRF1010EZPBF maintains the same 60V Vdss rating, TO-220AB package, and through-hole mounting type. The higher current rating (75A vs. 55A) and lower on-state resistance provide improved performance without requiring circuit modifications. All electrical parameters are compatible with the original specification.

Q: What is the difference between TO-220AB and TO-220-3 packages?

A: Both are through-hole packages with three leads (Gate, Drain, Source) and are mechanically compatible for PCB mounting. TO-220AB and TO-220-3 designations refer to the same physical package form factor. Parts specified as either package type can be used interchangeably in applications designed for through-hole TO-220 mounting.

Q: Why is the HUF75332P3 listed as a substitute if it has 55V instead of 60V Vdss?

A: The HUF75332P3 is included because it meets the continuous drain current requirement (60A exceeds 55A) and maintains the same package type. However, the 55V Vdss rating is 5V lower than the original 60V specification. This part is suitable only for applications where the circuit operates below 55V or where the reduced voltage margin is acceptable. For applications requiring the full 60V rating, this part should not be selected.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active and obsolete substitute parts listed in this reference carry ROHS3 Compliant status, matching the environmental compliance of the original IRFZ44VPBF.

Q: What does "Not For New Designs" status mean for the IRFZ44VPBF?

A: This designation indicates that Infineon Technologies has discontinued this part for new product development. While existing inventory remains available (20,534 pieces), the manufacturer recommends using alternative parts for new designs. The IRF1010EZPBF is the recommended replacement from Infineon's active product line.

Q: How do I choose between multiple substitute options?

A: Selection depends on your specific application requirements. For direct replacement with improved performance, choose IRF1010EZPBF (Infineon, Active). For equivalent specifications from an alternative manufacturer, choose STP55NF06 (STMicroelectronics, Active). For applications with lower current requirements, IRFZ44PBF or IRFZ44RPBF (Vishay, Active) are suitable. Always verify that the selected part's continuous drain current meets or exceeds your application's maximum current requirement.

Q: What is the significance of on-state resistance (Rds On) differences?

A: Lower Rds On values result in reduced power dissipation and heat generation during operation. The IRF1010EZPBF (8.5 mOhm) has significantly lower Rds On than the original IRFZ44VPBF (16.5 mOhm), providing improved efficiency. However, higher Rds On values do not prevent substitution if the part meets voltage and current requirements; they simply result in higher power loss in the same application.

Q: Can I use a 100A rated part like PSMN4R6-60PS,127 as a substitute?

A: While the PSMN4R6-60PS,127 exceeds the current requirement, it is classified as Obsolete and should not be selected for new designs. Additionally, its higher gate charge (70.8 nC) and input capacitance (4426 pF) may affect switching characteristics in some applications. For new designs, select from active product status alternatives.

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