AUIRFS8405 N-Channel 40V 120A MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRFS8405 is an N-Channel 40V 120A MOSFET manufactured by Infineon Technologies in the HEXFET® series. This device is rated for continuous drain current of 120A at 25°C with a maximum power dissipation of 163W, packaged in the TO-263-3 (D2PAK) surface mount configuration. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	120	A
Rds On (Max) @ Id, Vgs	2.3	mOhm @ 100A, 10V
Gate Threshold Voltage (Vgs(th)) @ Id	3.9	V @ 100µA
Gate Charge (Qg) @ Vgs	161	nC @ 10V
Power Dissipation (Max)	163	W
Operating Temperature Range	-55 to 175	°C
Package Type	TO-263-3 (D2PAK)	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AUIRFS8405 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Drain to Source Voltage (Vdss) must equal or exceed 40V
Continuous Drain Current (Id) must meet or exceed 120A at 25°C
Gate drive voltage compatibility at 10V
Operating temperature range of -55°C to 175°C
RoHS3 compliance and MSL Level 1 rating

Mechanical Compatibility Requirements:

Surface mount packaging in TO-263-3 (D2PAK) or compatible footprint
Pin configuration compatible with PG-TO263-3 supplier device package

Substitution Logic: Substitute parts are grouped into two categories based on their relationship to the main part specifications:

Direct Equivalents – Parts with matching 120A continuous drain current rating and identical 40V Vdss rating, maintaining the same current handling capability
Higher-Current Alternatives – Parts with 40V Vdss rating but higher continuous drain current ratings (90A minimum), suitable for applications where the original 120A specification can be met by lower-rated devices or where higher current capability provides design margin

All substitute parts maintain the same voltage rating, operating temperature range, surface mount configuration, and compliance certifications as the original AUIRFS8405.

Parameter Comparison

Parameter	AUIRFS8405	IPB90N04S402ATMA1	IXTA300N04T2-7	SQM120N04-1M7_GE3	SQM120N04-1M9_GE3	STB270N4F3
Manufacturer	Infineon	Infineon	IXYS	Vishay Siliconix	Vishay Siliconix	STMicroelectronics
Series	HEXFET®	OptiMOS™	TrenchT2™	TrenchFET®	TrenchFET®	STripFET™ III
Product Status	Obsolete	Active	Active	Active	Active	Active
Vdss (V)	40	40	40	40	40	40
Id @ 25°C (A)	120	90	300	120	120	160
Rds On (Max) (mOhm)	2.3 @ 100A, 10V	2.1 @ 90A, 10V	2.5 @ 50A, 10V	1.7 @ 30A, 10V	1.9 @ 30A, 10V	2.5 @ 80A, 10V
Vgs(th) (Max) (V)	3.9 @ 100µA	4.0 @ 95µA	4.0 @ 250µA	3.5 @ 250µA	3.5 @ 250µA	4.0 @ 250µA
Gate Charge Qg (Max) (nC)	161 @ 10V	118 @ 10V	145 @ 10V	310 @ 10V	270 @ 10V	150 @ 10V
Power Dissipation (Max) (W)	163	150	480	300	300	330
Operating Temperature (°C)	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175	-55 to 175
Package	TO-263-3 (D2PAK)	PG-TO263-3	TO-263-7 (IXTA)	TO-263 (D2PAK)	TO-263 (D2PAK)	D2PAK
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Direct Current Rating Match):

The SQM120N04-1M7_GE3 and SQM120N04-1M9_GE3 from Vishay Siliconix are the most direct equivalents, both rated for 120A continuous drain current at 40V Vdss. Both parts are active products with AEC-Q101 automotive qualification (SQM120N04-1M7_GE3) or standard industrial qualification. These devices maintain the same current handling capability as the AUIRFS8405 and are packaged in compatible TO-263 (D2PAK) surface mount configurations. The primary difference between these two variants is the on-resistance specification: SQM120N04-1M7_GE3 specifies 1.7mOhm maximum while SQM120N04-1M9_GE3 specifies 1.9mOhm maximum, both measured at 30A and 10V gate drive.

Secondary Substitutes (Higher Current Capability):

The STB270N4F3 from STMicroelectronics provides 160A continuous drain current at 40V Vdss with AEC-Q101 automotive qualification. This device offers higher current capacity than the original AUIRFS8405 while maintaining the same voltage rating and operating temperature range. The STB270N4F3 is packaged in D2PAK surface mount configuration compatible with the original footprint.

The IXTA300N04T2-7 from IXYS provides 300A continuous drain current at 40V Vdss, representing the highest current capability among available substitutes. This device is packaged in TO-263-7 (IXTA) surface mount configuration, which differs from the original TO-263-3 package and requires verification of PCB layout compatibility.

Lower Current Alternative:

The IPB90N04S402ATMA1 from Infineon (OptiMOS™ series) provides 90A continuous drain current at 40V Vdss. This device is suitable only for applications where the design current requirement does not exceed 90A. It is packaged in PG-TO263-3 surface mount configuration and is an active product.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and the -55°C to 175°C operating temperature range of the original AUIRFS8405.

Frequently Asked Questions (FAQ)

Q: Can the IPB90N04S402ATMA1 (90A) be used as a direct replacement for the AUIRFS8405 (120A)?

A: The IPB90N04S402ATMA1 is suitable only for applications where the maximum continuous drain current requirement does not exceed 90A. If the design requires the full 120A capability of the original AUIRFS8405, this substitute is not appropriate. For applications with lower current requirements, the IPB90N04S402ATMA1 provides an active alternative with improved on-resistance characteristics (2.1mOhm vs. 2.3mOhm).

Q: What is the difference between SQM120N04-1M7_GE3 and SQM120N04-1M9_GE3?

A: Both devices are rated for 120A continuous drain current at 40V Vdss and are packaged in compatible TO-263 (D2PAK) surface mount configurations. The primary specification difference is the maximum on-resistance: SQM120N04-1M7_GE3 specifies 1.7mOhm maximum while SQM120N04-1M9_GE3 specifies 1.9mOhm maximum, both measured at 30A and 10V gate drive. The SQM120N04-1M7_GE3 includes AEC-Q101 automotive qualification, while the SQM120N04-1M9_GE3 is qualified for industrial applications.

Q: Is the IXTA300N04T2-7 package compatible with the original AUIRFS8405 footprint?

A: The IXTA300N04T2-7 is packaged in TO-263-7 (IXTA) surface mount configuration with 6 leads plus tab, whereas the AUIRFS8405 uses TO-263-3 (D2PAK) with 2 leads plus tab. PCB layout compatibility must be verified before substitution. The TO-263-7 package is physically larger and requires different pad configuration.

Q: Do all substitute parts maintain the same operating temperature range?

A: Yes. All substitute parts listed maintain the -55°C to 175°C operating temperature range of the original AUIRFS8405.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the compliance status of the original AUIRFS8405.

Q: What is the significance of the gate charge (Qg) differences among substitute parts?

A: Gate charge affects switching speed and gate drive circuit requirements. The AUIRFS8405 specifies 161nC gate charge at 10V. Substitute parts range from 118nC (IPB90N04S402ATMA1) to 310nC (SQM120N04-1M7_GE3). Lower gate charge values enable faster switching with lower gate drive power dissipation. Higher gate charge values may require higher gate drive current capability. Gate drive circuit design must accommodate the specific gate charge of the selected substitute.

Q: Can the STB270N4F3 (160A) be used in place of the AUIRFS8405 (120A)?

A: Yes. The STB270N04F3 provides higher continuous drain current (160A) at the same 40V Vdss rating. This device is suitable for applications designed for the AUIRFS8405 and provides additional current margin. The STB270N4F3 is packaged in D2PAK surface mount configuration compatible with the original footprint and includes AEC-Q101 automotive qualification.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters for substitution are: (1) Drain to Source Voltage (Vdss) must equal or exceed 40V, (2) Continuous Drain Current (Id) must meet the application requirement (minimum 90A for lower-current alternatives, 120A for direct equivalents, or higher for over-specified designs), (3) Gate drive voltage compatibility at 10V, (4) Operating temperature range of -55°C to 175°C, and (5) Surface mount packaging in TO-263 series configurations.

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