AUIRFZ44ZSTRL N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRFZ44ZSTRL is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 55V drain-to-source voltage and 51A continuous drain current in a D2PAK surface mount package. This device is classified as Obsolete, indicating it has reached end-of-life status and is no longer recommended for new designs. Finding equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for existing applications.

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	13.9	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	4	V
Gate Charge (Qg) @ 10V	43	nC
Power Dissipation (Max)	80	W
Operating Temperature Range	-55 to 175	°C
Package Type	D2PAK (TO-263-3)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the AUIRFZ44ZSTRL is determined by the following critical parameters:

Electrical Compatibility Criteria:

Drain-to-Source Voltage (Vdss) must be greater than or equal to 55V
Continuous Drain Current (Id) must be greater than or equal to 51A at 25°C
Gate Threshold Voltage (Vgs(th)) must be compatible at 4V nominal
Maximum Gate Voltage (Vgs Max) must be ±20V or greater
Operating Temperature Range must encompass -55°C to 175°C

Mechanical Compatibility Criteria:

Package must be D2PAK (TO-263-3) or equivalent surface mount configuration
Mounting type must be Surface Mount
Pin configuration must match TO-263-3 standard (2 Leads + Tab)

Compliance Criteria:

RoHS3 Compliance required
Moisture Sensitivity Level (MSL) of 1 (Unlimited) preferred
REACH Unaffected status required

Substitute parts are grouped into two categories: MFR Recommended substitutes (higher current or voltage ratings with active product status) and Parametric Equivalent substitutes (matching electrical specifications with alternative product status).

Parameter Comparison

Parameter	AUIRFZ44ZSTRL	IPB80N06S407ATMA2	IRFZ44ZSTRRPBF	IXTA70N075T2	PSMN015-60BS,118	PSMN7R6-60BS,118
Manufacturer	Infineon	Infineon	Infineon	IXYS	Nexperia	Nexperia
Vdss (V)	55	60	55	75	60	60
Id @ 25°C (A)	51	80	51	70	50	92
Rds On (mOhm)	13.9 @ 31A, 10V	Not specified @ same conditions	13.9 @ 31A, 10V	12 @ 25A, 10V	14.8 @ 15A, 10V	7.8 @ 25A, 10V
Vgs(th) (V)	4 @ 250µA	4 @ 40µA	4 @ 250µA	4 @ 250µA	4 @ 1mA	4 @ 1mA
Qg (nC)	43 @ 10V	56 @ 10V	43 @ 10V	46 @ 10V	20.9 @ 10V	38.7 @ 10V
Ciss (pF)	1420 @ 25V	4500 @ 25V	1420 @ 25V	2725 @ 25V	1220 @ 30V	2651 @ 30V
Power Dissipation (W)	80	79	80	150	86	149
Operating Temp (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	D2PAK	PG-TO263-3-2	D2PAK	TO-263AA	D2PAK	D2PAK
Product Status	Obsolete	Active	Not For New Designs	Active	Active	Active
RoHS3 Compliance	Yes	Yes	Yes	Yes	Yes	Yes
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent):

IRFZ44ZSTRRPBF is the parametric equivalent substitute, offering identical electrical specifications (55V, 51A, 13.9mOhm Rds On, 43nC gate charge) and matching D2PAK package configuration. This part maintains full compatibility with existing PCB layouts and circuit designs. However, IRFZ44ZSTRRPBF carries a "Not For New Designs" product status, indicating limited long-term availability. This substitute is suitable for sustaining production of existing designs or as an interim solution.

For Enhanced Performance (MFR Recommended):

IPB80N06S407ATMA2 (Infineon OptiMOS™ series, Active status) provides superior specifications with 60V rating, 80A continuous current, and maintains the D2PAK package. This part offers higher current capacity and active product status, ensuring long-term supply chain availability. The increased gate charge (56nC vs. 43nC) and input capacitance (4500pF vs. 1420pF) require circuit evaluation for gate drive compatibility.

PSMN7R6-60BS,118 (Nexperia, Active status) delivers the lowest on-state resistance (7.8mOhm) and highest current rating (92A) among substitutes, with 60V rating and D2PAK package. This part is optimized for applications requiring minimal conduction losses. The reduced gate charge (38.7nC) improves switching efficiency.

PSMN015-60BS,118 (Nexperia, Active status) provides a conservative upgrade with 60V rating, 50A current (matching original specification), and D2PAK package. This part features the lowest gate charge (20.9nC) and input capacitance (1220pF), minimizing gate drive requirements.

IXTA70N075T2 (IXYS TrenchT2™ series, Active status) offers the highest voltage rating (75V) and current capacity (70A) with superior power dissipation (150W). This part is suitable for applications requiring higher voltage margin or increased thermal headroom. The TO-263AA package is mechanically compatible with D2PAK footprints.

Compliance and Certification:

All substitute parts maintain RoHS3 compliance, MSL 1 (Unlimited) rating, and REACH Unaffected status, matching the original part's regulatory requirements. IPB80N06S407ATMA2 includes AEC-Q101 automotive qualification, providing additional reliability assurance for automotive applications.

Frequently Asked Questions (FAQ)

Q: Can IRFZ44ZSTRRPBF be used as a direct drop-in replacement for AUIRFZ44ZSTRL?

A: Yes. IRFZ44ZSTRRPBF is a parametric equivalent with identical electrical specifications (55V, 51A, 13.9mOhm Rds On) and D2PAK package. No circuit modifications are required. However, verify long-term availability due to its "Not For New Designs" status.

Q: What is the difference between MFR Recommended and Parametric Equivalent substitutes?

A: Parametric Equivalent substitutes (IRFZ44ZSTRRPBF) match the original part's electrical specifications exactly and require no circuit changes. MFR Recommended substitutes (IPB80N06S407ATMA2, PSMN7R6-60BS,118, IXTA70N075T2, PSMN015-60BS,118) offer enhanced ratings or active product status but may require circuit evaluation for gate drive compatibility or thermal management.

Q: Which substitute offers the best long-term supply availability?

A: IPB80N06S407ATMA2, PSMN7R6-60BS,118, PSMN015-60BS,118, and IXTA70N075T2 all carry Active product status, ensuring ongoing manufacturing and supply chain support. These parts are recommended for new designs or long-term production commitments.

Q: Are all substitutes compatible with the original D2PAK footprint?

A: Yes. All substitute parts use D2PAK (TO-263-3) or equivalent surface mount packages (PG-TO263-3-2, TO-263AA) with identical pin configurations and footprint compatibility.

Q: What are the key differences in gate charge between substitutes?

A: Gate charge ranges from 20.9nC (PSMN015-60BS,118) to 56nC (IPB80N06S407ATMA2). Lower gate charge reduces gate drive power and improves switching speed. Verify gate driver capability for parts with significantly different gate charge specifications.

Q: Which substitute is best for high-current applications?

A: PSMN7R6-60BS,118 offers the highest continuous drain current (92A) and lowest on-state resistance (7.8mOhm), minimizing conduction losses in high-current circuits.

Q: Do all substitutes meet the same compliance standards as the original part?

A: Yes. All substitutes maintain RoHS3 compliance, MSL 1 (Unlimited) rating, and REACH Unaffected status. IPB80N06S407ATMA2 additionally qualifies to AEC-Q101 automotive standards.

Q: Can IXTA70N075T2 be used in circuits designed for 55V operation?

A: Yes. IXTA70N075T2 has a 75V rating, which exceeds the 55V requirement. The higher voltage rating provides additional safety margin. Verify that the increased input capacitance (2725pF) and gate charge (46nC) are compatible with the gate drive circuit.

Q: What is the impact of higher input capacitance on circuit performance?

A: Higher input capacitance (Ciss) increases gate drive current requirements and may slow switching transitions. IPB80N06S407ATMA2 (4500pF) has significantly higher Ciss than the original (1420pF), requiring gate driver evaluation. PSMN015-60BS,118 (1220pF) has lower Ciss, improving switching performance.

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