IRFZ46NSTRL N-Channel MOSFET 55V 53A D2PAK Equivalent & Substitute Parts

Part Overview

The IRFZ46NSTRL is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 53A continuous drain current in a D2PAK surface mount package. This device is classified as Obsolete, indicating it is no longer in active production. Due to its obsolete status, equivalent substitute parts with matching or superior electrical and mechanical specifications are necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility with D2PAK packaging and preserve critical electrical parameters including voltage rating, current capacity, and on-resistance characteristics.

Key Parameters

Parameter	Value	Specification Basis
Drain-to-Source Voltage (Vdss)	55 V	Maximum voltage rating
Continuous Drain Current (Id) @ 25°C	53 A (Tc)	Maximum current capacity
On-Resistance (Rds On Max) @ Id, Vgs	16.5 mOhm @ 28A, 10V	Conduction loss parameter
Gate Threshold Voltage (Vgs(th) Max) @ Id	4 V @ 250 µA	Gate drive requirement
Gate Charge (Qg Max) @ Vgs	72 nC @ 10 V	Switching speed parameter
Power Dissipation (Max)	3.8 W (Ta), 107 W (Tc)	Thermal rating
Operating Temperature Range	-55°C to 175°C (TJ)	Junction temperature limits
Package Type	D2PAK (TO-263-3)	Surface mount package
Gate Voltage (Vgs Max)	±20 V	Maximum gate drive voltage
Input Capacitance (Ciss Max) @ Vds	1696 pF @ 25 V	Gate capacitance parameter

Substitute Part Grouping Explanation

Substitution eligibility for the IRFZ46NSTRL is determined by the following critical parameters:

Primary Substitution Criteria:

Drain-to-Source Voltage (Vdss): Must be equal to or greater than 55 V
Continuous Drain Current (Id): Must be equal to or greater than 53 A
Package Type: Must be D2PAK (TO-263-3) for mechanical compatibility
On-Resistance (Rds On): Must not exceed the original specification to maintain conduction efficiency
Operating Temperature Range: Must encompass -55°C to 175°C
Gate Voltage Rating (Vgs Max): Must support ±20 V or greater

Substitution Logic: Parts are grouped into two categories based on electrical performance relative to the IRFZ46NSTRL:

Direct Parametric Equivalents: Parts with identical or near-identical electrical specifications, including IRFZ46NSTRLPBF (same base device, different packaging/compliance status).
Enhanced Performance Substitutes: Parts with higher voltage ratings (60 V), equal or superior current ratings (50-60 A), and improved on-resistance characteristics. These devices provide superior thermal performance and are suitable for applications requiring higher reliability margins.

All substitute parts listed maintain D2PAK packaging, surface mount mounting type, and compatible gate drive voltage requirements.

Parameter Comparison

Parameter	IRFZ46NSTRL	IRFZ46NSTRLPBF	PSMN015-60BS,118	STB55NF06LT4	STB55NF06T4	STB60NF06T4
Manufacturer	Infineon	Infineon	Nexperia	STMicroelectronics	STMicroelectronics	STMicroelectronics
Vdss (V)	55	55	60	60	60	60
Id @ 25°C (A)	53	53	50	55	50	60
Rds On Max (mOhm)	16.5 @ 28A, 10V	16.5 @ 28A, 10V	14.8 @ 15A, 10V	18 @ 27.5A, 10V	18 @ 27.5A, 10V	16 @ 30A, 10V
Vgs(th) Max (V)	4 @ 250 µA	4 @ 250 µA	4 @ 1 mA	4.7 @ 250 µA	4 @ 250 µA	4 @ 250 µA
Qg Max (nC)	72 @ 10V	72 @ 10V	20.9 @ 10V	37 @ 4.5V	60 @ 10V	66 @ 10V
Vgs Max (V)	±20	±20	±20	±16	±20	±20
Ciss Max (pF)	1696 @ 25V	1696 @ 25V	1220 @ 30V	1700 @ 25V	1300 @ 25V	1810 @ 25V
Power Dissipation Max (W)	107 (Tc)	107 (Tc)	86 (Tc)	95 (Tc)	110 (Tc)	110 (Tc)
Operating Temp Range (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-65 to 175
Package	D2PAK	D2PAK	D2PAK	D2PAK	D2PAK	D2PAK
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Obsolete Stock Mitigation):

IRFZ46NSTRLPBF is the primary direct parametric equivalent, offering identical electrical specifications to the IRFZ46NSTRL. This part is manufactured by Infineon Technologies and maintains the same 55V/53A rating, on-resistance, and gate charge characteristics. IRFZ46NSTRLPBF is ROHS3 compliant and available in Cut Tape and Digi-Reel packaging formats. However, this part is classified as "Not For New Designs," indicating limited long-term availability. Current inventory is 2276 pieces.

For New Design Implementation (Active Product Status):

STB55NF06LT4 and STB55NF06T4 (STMicroelectronics STripFET™ II series) are recommended for new designs requiring active product status and long-term supply assurance. Both devices are rated for 60V operation, providing a 5V margin above the original 55V specification. STB55NF06LT4 delivers 55A continuous drain current, matching the original device capability. STB55NF06T4 provides 50A continuous drain current with superior thermal performance (110W Tc rating). Both parts are ROHS3 compliant and available in Cut Tape and Digi-Reel packaging.

STB60NF06T4 (STMicroelectronics) offers the highest current capacity at 60A with 60V voltage rating and 110W thermal dissipation. This device provides maximum performance headroom for applications requiring enhanced current handling or thermal margin. Operating temperature range extends to -65°C, exceeding the original specification.

For Thermal Performance Priority:

PSMN015-60BS,118 (Nexperia) is recommended when thermal performance is critical. This device features the lowest on-resistance specification (14.8 mOhm @ 15A, 10V) and reduced gate charge (20.9 nC @ 10V), resulting in lower switching losses and improved efficiency. The 60V rating provides voltage margin, and 50A current rating is suitable for applications where current requirements are within this range. Inventory availability is highest at 12675 pieces.

Compliance and Supply Chain Considerations:

All recommended substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The IRFZ46NSTRL is RoHS non-compliant, making transition to compliant alternatives necessary for new production. All substitute parts maintain D2PAK packaging compatibility and surface mount mounting type, requiring no PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can IRFZ46NSTRLPBF be used as a direct replacement for IRFZ46NSTRL?

A: Yes. IRFZ46NSTRLPBF is a direct parametric equivalent with identical electrical specifications: 55V Vdss, 53A Id, 16.5 mOhm Rds On, and 72 nC gate charge. The primary difference is packaging format (Cut Tape/Digi-Reel vs. standard) and product status classification. Both parts are D2PAK surface mount devices with identical pin configurations and electrical performance. However, IRFZ46NSTRLPBF is classified as "Not For New Designs," indicating limited future availability.

Q: What is the minimum voltage rating required for a substitute part?

A: Substitute parts must have a Vdss rating equal to or greater than 55V. Parts rated at 60V (PSMN015-60BS,118, STB55NF06LT4, STB55NF06T4, STB60NF06T4) provide a 5V safety margin and are suitable for all applications designed for the original 55V device. Higher voltage ratings do not compromise performance in 55V applications.

Q: What is the minimum continuous drain current requirement for substitution?

A: Substitute parts must have an Id rating equal to or greater than 53A. STB55NF06LT4 and STB60NF06T4 meet or exceed this requirement (55A and 60A respectively). PSMN015-60BS,118 and STB55NF06T4 are rated at 50A, which is below the original specification. These lower-current devices are suitable only for applications where actual operating current does not exceed 50A.

Q: Are all substitute parts compatible with the original D2PAK footprint?

A: Yes. All listed substitute parts use D2PAK (TO-263-3) packaging with identical pin configuration and mechanical dimensions. No PCB redesign or footprint modification is required. All devices are surface mount components with the same thermal tab and lead spacing.

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

A: On-resistance directly affects conduction losses and heat generation. Lower Rds On values reduce power dissipation and improve efficiency. PSMN015-60BS,118 features the lowest Rds On (14.8 mOhm @ 15A, 10V), resulting in minimal conduction losses. STB60NF06T4 provides 16 mOhm @ 30A, 10V, comparable to the original device. Higher Rds On values (18 mOhm for STB55NF06LT4 and STB55NF06T4) result in increased heat generation but remain within acceptable limits for most applications.

Q: Why do some substitute parts have lower gate charge (Qg) specifications?

A: Gate charge affects switching speed and gate drive power requirements. Lower Qg values (PSMN015-60BS,118 at 20.9 nC) enable faster switching transitions and reduce gate driver stress. Higher Qg values (IRFZ46NSTRL and IRFZ46NSTRLPBF at 72 nC) require longer switching times but are compatible with standard gate drive circuits. Gate charge differences do not prevent substitution but may affect circuit performance in high-frequency switching applications.

Q: What is the difference between "Obsolete" and "Not For New Designs" product status?

A: "Obsolete" status (IRFZ46NSTRL) indicates the part is no longer manufactured and existing inventory is limited. "Not For New Designs" status (IRFZ46NSTRLPBF) indicates the manufacturer continues limited production but does not recommend the part for new product development. Both statuses indicate supply risk. Active status parts (STB55NF06LT4, STB55NF06T4, STB60NF06T4, PSMN015-60BS,118) are recommended for new designs to ensure long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original IRFZ46NSTRL is RoHS non-compliant. Transition to RoHS3 compliant alternatives is necessary for compliance with modern regulatory requirements and customer specifications.

Q: Can STB60NF06T4 be used in applications designed for 55V operation?

A: Yes. STB60NF06T4 is rated for 60V operation and is suitable for all applications designed for 55V devices. The higher voltage rating provides a 5V safety margin and does not compromise performance. The device will operate correctly at voltages up to 60V and is fully compatible with 55V circuit designs.

Q: What is the thermal performance difference between substitute parts?

A: Power dissipation ratings vary: IRFZ46NSTRL (107W Tc), PSMN015-60BS,118 (86W Tc), STB55NF06LT4 (95W Tc), STB55NF06T4 (110W Tc), STB60NF06T4 (110W Tc). Higher thermal ratings indicate superior heat dissipation capability. STB55NF06T4 and STB60NF06T4 provide the highest thermal performance at 110W, suitable for high-power applications. PSMN015-60BS,118 achieves lower dissipation through reduced on-resistance, resulting in lower heat generation rather than higher dissipation capacity.

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