IRFZ46ZPBF N-Channel 55V 51A MOSFET Equivalent & Substitute Parts

Part Overview

The IRFZ46ZPBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 51A continuous drain current in a TO-220AB through-hole package. This device is part of the HEXFET® series and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while offering improved availability and compliance status.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	55	V
Continuous Drain Current (Id) @ 25°C	51	A
On-State Resistance (Rds On) @ 31A, 10V	13.6	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	46	nC
Power Dissipation (Max)	82	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-220AB	—
Mounting Type	Through Hole	—

Substitute Part Grouping Explanation

Substitution of the IRFZ46ZPBF is determined by the following critical electrical and mechanical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 55V
Continuous Drain Current (Id): Must equal or exceed 51A at 25°C
Gate Drive Voltage: Must support 10V operation
Gate Threshold Voltage (Vgs(th)): Must be compatible with 4V specification
Package Type: TO-220AB or TO-220-3 (mechanically compatible)
Mounting Type: Through Hole

Substitution Logic: Substitute parts are grouped based on whether they meet or exceed the electrical performance of the original part while maintaining the same voltage class (55V) and current rating (51A minimum). Parts with higher current ratings, lower on-state resistance, or higher power dissipation ratings are acceptable as direct substitutes. Parts with different voltage ratings or significantly lower current ratings are not suitable substitutes.

Parameter Comparison

Parameter	IRFZ46ZPBF	HUF75332P3	HUF75339P3	HUF75344P3	IRF60B217	PHP191NQ06LT,127	PHP79NQ08LT,127	STP60NF06L
Manufacturer	Infineon	onsemi	onsemi	onsemi	International Rectifier	Nexperia USA Inc.	Nexperia USA Inc.	STMicroelectronics
Vdss (V)	55	55	55	55	60	55	75	60
Id @ 25°C (A)	51	60	75	75	60	75	73	60
Rds On (mOhm)	13.6 @ 31A, 10V	19 @ 60A, 10V	12 @ 75A, 10V	8 @ 75A, 10V	9 @ 36A, 10V	3.7 @ 25A, 10V	16 @ 25A, 10V	14 @ 30A, 10V
Vgs(th) (V)	4 @ 250µA	4 @ 250µA	4 @ 250µA	4 @ 250µA	3.7 @ 50µA	2 @ 1mA	2 @ 1mA	1 @ 250µA
Qg (nC)	46 @ 10V	85 @ 20V	130 @ 20V	210 @ 20V	66 @ 10V	95.6 @ 5V	30 @ 5V	66 @ 4.5V
Power Dissipation (W)	82	145	200	285	83	300	157	110
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-65 to 175
Package	TO-220AB	TO-220-3	TO-220-3	TO-220-3	PG-TO220-3-1	TO-220AB	TO-220AB	TO-220
Product Status	Obsolete	Active	Active	Active	Obsolete	Obsolete	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance):

The HUF75332P3, HUF75339P3, and HUF75344P3 from onsemi are the preferred substitutes. All three are active products with ROHS3 compliance and maintain the 55V voltage rating. HUF75332P3 provides 60A current rating with 19mOhm on-state resistance. HUF75339P3 and HUF75344P3 both provide 75A current rating, with HUF75344P3 offering superior performance at 8mOhm on-state resistance and 285W power dissipation. These parts are mechanically compatible in TO-220-3 packages and electrically superior to the original IRFZ46ZPBF.

STP60NF06L from STMicroelectronics is an active product with ROHS3 compliance, rated for 60V and 60A. It provides equivalent current capability with 14mOhm on-state resistance and 110W power dissipation. This part is suitable for applications requiring the original performance envelope.

Secondary Substitutes (Obsolete Status, Limited Availability):

PHP191NQ06LT,127 and PHP79NQ08LT,127 from Nexperia USA Inc. are obsolete products with ROHS3 compliance. PHP191NQ06LT,127 maintains 55V rating with 75A capability and exceptional 3.7mOhm on-state resistance. PHP79NQ08LT,127 operates at 75V with 73A capability. These parts are available in limited quantities and should be used only when active alternatives are insufficient.

IRF60B217 from International Rectifier is an obsolete product with RoHS non-compliance status and should not be selected for new designs requiring regulatory compliance.

Recommendation Summary:

For new designs and production requiring regulatory compliance and long-term availability, select HUF75344P3 (onsemi) or STP60NF06L (STMicroelectronics). Both are active products with ROHS3 compliance and provide electrical performance equal to or exceeding the IRFZ46ZPBF. For applications with specific thermal or performance requirements, HUF75339P3 offers a balanced alternative with 200W power dissipation.

Frequently Asked Questions (FAQ)

Q: Can HUF75332P3 directly replace IRFZ46ZPBF in existing designs?

A: Yes. HUF75332P3 meets the minimum electrical requirements with 55V Vdss and 60A continuous drain current, exceeding the original 51A specification. The TO-220-3 package is mechanically compatible with TO-220AB footprints. Gate threshold voltage (4V @ 250µA) matches the original specification, ensuring compatible gate drive circuits.

Q: What is the difference between HUF75339P3 and HUF75344P3?

A: Both parts are rated for 55V and 75A continuous drain current. HUF75344P3 provides superior performance with 8mOhm on-state resistance compared to 12mOhm for HUF75339P3, and 285W power dissipation compared to 200W. HUF75344P3 is the preferred choice for applications requiring lower conduction losses and higher thermal capability.

Q: Why is PHP191NQ06LT,127 listed as obsolete when it offers superior specifications?

A: PHP191NQ06LT,127 is classified as obsolete by the manufacturer despite ROHS3 compliance. Obsolete products have limited inventory and no guaranteed long-term availability. Active products from onsemi and STMicroelectronics provide equivalent or superior performance with assured supply continuity.

Q: Is STP60NF06L suitable for high-frequency switching applications?

A: STP60NF06L has a gate charge of 66nC @ 4.5V, comparable to the original IRFZ46ZPBF (46nC @ 10V). The lower gate charge specification indicates faster switching characteristics. Verify gate drive circuit compatibility with the 1V threshold voltage specification, which is lower than the original 4V.

Q: Can I use PHP79NQ08LT,127 as a substitute despite the higher 75V rating?

A: PHP79NQ08LT,127 is electrically compatible as a substitute due to its 73A continuous drain current and 55V minimum voltage capability. However, the 75V rating is not required for 55V applications. The higher voltage rating does not provide additional benefit and represents unnecessary cost. Select 55V-rated parts (HUF75332P3, HUF75339P3, HUF75344P3, or STP60NF06L) for optimal cost-performance.

Q: What are the package compatibility considerations?

A: IRFZ46ZPBF uses TO-220AB package. Substitute parts use TO-220-3 or TO-220 packages. All three package variants (TO-220AB, TO-220-3, TO-220) are mechanically compatible with standard TO-220 PCB footprints and heatsink mounting hardware. Verify pin assignment compatibility: all listed substitutes maintain standard drain-gate-source pin configuration.

Q: Should I consider IRF60B217 for cost reduction?

A: No. IRF60B217 is RoHS non-compliant and obsolete. It does not meet current regulatory requirements for new designs. Active, RoHS3-compliant alternatives (HUF75332P3, HUF75339P3, HUF75344P3, STP60NF06L) are available at competitive pricing with superior compliance status and supply assurance.

Q: How do gate charge differences affect circuit design?

A: Gate charge (Qg) determines the energy required to switch the MOSFET. IRFZ46ZPBF requires 46nC @ 10V. Substitutes range from 30nC (PHP79NQ08LT,127) to 210nC (HUF75344P3). Higher gate charge requires more gate drive current or longer switching time. Verify gate driver capability before selecting parts with significantly higher gate charge specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message