IRFZ44VZ N-Channel 60V 57A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ44VZ is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 60V drain-source voltage and 57A continuous drain current at 25°C. This device features the HEXFET® series technology in a TO-220AB through-hole package. The part is classified as Obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production support. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, thermal characteristics, and package form factor while meeting modern RoHS compliance requirements.

Key Parameters

Parameter	Value	Unit
Drain-Source Voltage (Vdss)	60	V
Continuous Drain Current (Id) @ 25°C	57	A
On-State Resistance (Rds On) @ 34A, 10V	12	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	65	nC
Power Dissipation (Max)	92	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220AB	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IRFZ44VZ is determined by strict adherence to the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Drain-Source Voltage (Vdss): Must equal or exceed 60V
Continuous Drain Current (Id): Must equal or exceed 57A at 25°C
Package Type: TO-220AB or TO-220-3 (mechanically compatible)
Mounting Type: Through Hole
Gate-Source Voltage (Vgs): Must accommodate ±20V or greater range
Operating Temperature: Must span -55°C to 175°C or equivalent range

Secondary Compatibility Factors:

On-State Resistance (Rds On): Lower values indicate improved performance; values at or below 12mOhm @ 10V are preferred
Gate Charge (Qg): Lower values reduce switching losses; 65nC serves as reference
Power Dissipation: 92W minimum capability required

Substitute parts are grouped into three categories based on their relationship to the IRFZ44VZ specifications:

Category 1 - Direct Equivalents: Parts with identical or near-identical electrical specifications and same manufacturer lineage (IRFZ44VZPBF, IRFZ44PBF, IRFZ44RPBF).

Category 2 - Enhanced Performance Substitutes: Parts exceeding IRFZ44VZ specifications in current rating or power dissipation while maintaining 60V Vdss and TO-220 package compatibility (IRF1018EPBF, STP60NF06L, STP55NF06, PSMN3R0-60PS,127, PSMN4R6-60PS,127).

Category 3 - Reduced Performance Substitutes: Parts meeting minimum voltage and package requirements but with lower current ratings or power dissipation (STP45NF06, CSD18537NKCS).

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On (mOhm)	Qg (nC)	Power Diss. (W)	Package	Status	RoHS
IRFZ44VZ	Infineon	60	57	12 @ 34A, 10V	65 @ 10V	92	TO-220AB	Obsolete	Non-compliant
IRFZ44VZPBF	Infineon	60	57	12 @ 34A, 10V	65 @ 10V	92	TO-220AB	Not For New Designs	ROHS3 Compliant
IRF1018EPBF	Infineon	60	79	8.4 @ 47A, 10V	69 @ 10V	110	TO-220AB	Active	ROHS3 Compliant
STP60NF06L	STMicroelectronics	60	60	14 @ 30A, 10V	66 @ 4.5V	110	TO-220	Active	ROHS3 Compliant
CSD18537NKCS	Texas Instruments	60	50	14 @ 25A, 10V	18 @ 10V	94	TO-220-3	Active	ROHS3 Compliant
IRFZ44PBF	Vishay Siliconix	60	50	28 @ 31A, 10V	67 @ 10V	150	TO-220AB	Active	ROHS3 Compliant
IRFZ44RPBF	Vishay Siliconix	60	50	28 @ 31A, 10V	67 @ 10V	150	TO-220AB	Active	ROHS3 Compliant
PSMN3R0-60PS,127	Nexperia USA Inc.	60	100	3 @ 25A, 10V	130 @ 10V	306	TO-220AB	Obsolete	ROHS3 Compliant
PSMN4R6-60PS,127	Nexperia USA Inc.	60	100	4.6 @ 25A, 10V	70.8 @ 10V	211	TO-220AB	Obsolete	ROHS3 Compliant
STP45NF06	STMicroelectronics	60	38	28 @ 19A, 10V	58 @ 10V	80	TO-220	Active	ROHS3 Compliant
STP55NF06	STMicroelectronics	60	50	18 @ 27.5A, 10V	60 @ 10V	110	TO-220	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

IRFZ44VZPBF is the direct equivalent of IRFZ44VZ with identical electrical parameters. This part carries ROHS3 compliance and is available in Tube packaging. Although classified as "Not For New Designs," it provides the most direct substitution path for legacy systems requiring exact parameter matching. Inventory availability is 2228 units.

For New Designs with Active Product Status:

IRF1018EPBF (Infineon, Active status) provides enhanced performance with 79A continuous drain current and 8.4mOhm on-state resistance, exceeding IRFZ44VZ specifications while maintaining 60V Vdss and TO-220AB package compatibility. This part is ROHS3 compliant with 16697 units in stock.

STP55NF06 (STMicroelectronics, Active status) offers 50A continuous drain current with 18mOhm on-state resistance in TO-220 package. This part is ROHS3 compliant with the highest inventory availability (155400 units) and represents a cost-effective alternative for applications where the full 57A rating is not required.

STP60NF06L (STMicroelectronics, Active status) provides 60A continuous drain current, exceeding IRFZ44VZ current rating, with 14mOhm on-state resistance and ROHS3 compliance. Package is TO-220 (mechanically compatible with TO-220AB).

For Applications Requiring Lower Current Ratings:

CSD18537NKCS (Texas Instruments, Active status) is suitable for applications where 50A continuous drain current is sufficient. This part features exceptionally low gate charge (18nC @ 10V), reducing switching losses. ROHS3 compliant with 1500 units in stock.

STP45NF06 (STMicroelectronics, Active status) accommodates 38A continuous drain current with 28mOhm on-state resistance. Suitable for reduced-current applications with ROHS3 compliance and 8822 units available.

For High-Current Applications:

PSMN4R6-60PS,127 (Nexperia USA Inc.) supports 100A continuous drain current with 4.6mOhm on-state resistance and 211W power dissipation. Although classified as Obsolete, this part is ROHS3 compliant with 8805 units in stock and represents a performance upgrade path.

PSMN3R0-60PS,127 (Nexperia USA Inc.) supports 100A continuous drain current with 3mOhm on-state resistance and 306W power dissipation. Obsolete status with ROHS3 compliance and 2280 units available.

Compliance Considerations:

All recommended active-status substitutes are ROHS3 compliant, addressing the non-compliance status of the original IRFZ44VZ. Parts classified as Obsolete should be reserved for legacy system maintenance only.

Frequently Asked Questions (FAQ)

Q1: Can IRFZ44VZPBF be used as a direct replacement for IRFZ44VZ?

A: Yes. IRFZ44VZPBF is electrically identical to IRFZ44VZ with matching 60V Vdss, 57A continuous drain current, 12mOhm on-state resistance, and TO-220AB package. The primary difference is ROHS3 compliance status and product lifecycle classification (Not For New Designs). For legacy applications, this represents the most direct substitution.

Q2: What is the primary reason to substitute IRFZ44VZ?

A: The IRFZ44VZ is classified as Obsolete and is not RoHS compliant. Active-status alternatives with RoHS3 compliance are recommended for new designs and long-term production support. Obsolescence also affects long-term availability and supply chain reliability.

Q3: Which substitute part offers the best performance upgrade?

A: IRF1018EPBF provides the most significant performance improvement while maintaining Infineon manufacturing lineage. It delivers 79A continuous drain current (versus 57A), 8.4mOhm on-state resistance (versus 12mOhm), and 110W power dissipation (versus 92W). All parameters are within the same TO-220AB package and operating temperature range. This part is Active status and ROHS3 compliant.

Q4: Are TO-220 and TO-220AB packages mechanically interchangeable?

A: TO-220 and TO-220AB are mechanically compatible for through-hole PCB mounting. Both feature three leads with identical pin spacing and mounting hole patterns. Electrical performance differences depend on the specific device characteristics, not package designation.

Q5: What is the significance of gate charge (Qg) in MOSFET substitution?

A: Gate charge determines the energy required to switch the MOSFET on and off. Lower gate charge reduces switching losses and allows faster switching speeds. IRFZ44VZ specifies 65nC @ 10V. CSD18537NKCS offers significantly lower gate charge (18nC @ 10V), beneficial for high-frequency switching applications. Higher gate charge values (such as PSMN series at 70.8-130nC) are acceptable for lower-frequency applications but increase switching losses.

Q6: Can parts with lower continuous drain current ratings substitute for IRFZ44VZ?

A: Substitution with lower current ratings is application-dependent. If the circuit operates below the substitute part's current rating with adequate safety margin, lower-rated parts are acceptable. However, this reduces design headroom and thermal margin. CSD18537NKCS (50A) and STP45NF06 (38A) are suitable only for applications where peak current demands do not approach these limits.

Q7: What does "Not For New Designs" product status mean?

A: This classification indicates the manufacturer is not recommending the part for new circuit designs. The part may still be available for legacy system support and repairs, but long-term availability is not guaranteed. Active-status alternatives should be prioritized for new designs to ensure supply chain continuity.

Q8: How does on-state resistance (Rds On) affect circuit performance?

A: On-state resistance directly determines conduction losses and heat dissipation. Lower Rds On values reduce power loss and thermal stress. IRFZ44VZ specifies 12mOhm @ 34A, 10V. IRF1018EPBF offers 8.4mOhm (lower loss), while IRFZ44PBF and IRFZ44RPBF specify 28mOhm (higher loss). For high-current applications, lower Rds On values are preferred to minimize thermal management requirements.

Q9: What inventory considerations apply to substitute selection?

A: STP55NF06 offers the highest inventory availability (155400 units), providing supply security for high-volume production. IRF1018EPBF (16697 units) and PSMN4R6-60PS,127 (8805 units) also provide substantial stock levels. Parts with lower inventory (CSD18537NKCS at 1500 units, IRFZ44PBF at 1446 units) may require longer lead times for large orders.

Q10: Are there thermal performance differences between substitute parts?

A: Yes. Power dissipation ratings vary significantly: IRFZ44VZ specifies 92W, while IRFZ44PBF and IRFZ44RPBF specify 150W, and PSMN3R0-60PS,127 specifies 306W. Higher power dissipation ratings indicate better thermal performance and reduced junction temperature rise under identical operating conditions. Selection should account for circuit thermal management capabilities and ambient temperature conditions.

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