IRF7471PBF Equivalent & Substitute Parts

Part Overview

The IRF7471PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 10A continuous drain current. This device is packaged in an 8-SO surface mount configuration and is part of the HEXFET® series. The IRF7471PBF is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	10	A
On-Resistance (Rds On) @ 10A, 10V	13	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	3	V
Gate Charge (Qg) @ 4.5V	32	nC
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-SOIC	-
Mounting Type	Surface Mount	-

Substitute Part Grouping Explanation

Substitution eligibility for the IRF7471PBF is determined by the following critical parameters:

Primary Compatibility Criteria:

Drain-to-Source Voltage (Vdss): Must equal or exceed 40V
Continuous Drain Current (Id): Must equal or exceed 10A at 25°C
Package Type: Must be 8-SOIC surface mount
Gate Threshold Voltage (Vgs(th)): Must be within ±20V maximum gate voltage specification
Operating Temperature Range: Must support -55°C to 150°C minimum

Substitute Parts Identified:

AO4484 (Alpha & Omega Semiconductor Inc.) - Active Status

Meets all primary criteria with 40V Vdss and 10A Id rating
Improved on-resistance performance (10mOhm vs. 13mOhm)
Reduced power dissipation (1.7W vs. 2.5W)
Identical package and mounting configuration
RoHS3 compliant

FDS4480 (onsemi) - Active Status

Exceeds primary criteria with 40V Vdss and 10.8A Id rating
Comparable on-resistance (12mOhm vs. 13mOhm)
Extended operating temperature range (-55°C to 175°C)
Identical package and mounting configuration
RoHS3 compliant

FDS5670 (onsemi) - Active Status

Exceeds voltage rating with 60V Vdss (suitable for 40V applications)
Meets current requirement with 10A Id rating
Slightly higher on-resistance (14mOhm vs. 13mOhm)
Identical package and mounting configuration
RoHS3 compliant

Parameter Comparison

Parameter	IRF7471PBF (Main)	AO4484	FDS4480	FDS5670	Unit
Manufacturer	Infineon Technologies	Alpha & Omega Semiconductor	onsemi	onsemi	-
Product Status	Obsolete	Active	Active	Active	-
Vdss	40	40	40	60	V
Id @ 25°C	10	10	10.8	10	A
Rds On @ Id, 10V	13	10	12	14	mOhm
Vgs(th) @ 250µA	3	3	5	4	V
Gate Charge (Qg)	32	37	41	70	nC
Power Dissipation (Max)	2.5	1.7	2.5	2.5	W
Operating Temperature	-55 to 150	-55 to 150	-55 to 175	-55 to 150	°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	-
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	-
RoHS Status	REACH Unaffected	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	-
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-

Engineering Selection Recommendations

AO4484 Selection Criteria:

Preferred for applications requiring reduced power dissipation (1.7W vs. 2.5W)
Superior on-resistance performance (10mOhm) reduces thermal load
Active product status ensures long-term availability and supply chain stability
RoHS3 compliance supports modern manufacturing and environmental standards
Identical thermal and electrical operating range to IRF7471PBF

FDS4480 Selection Criteria:

Suitable for applications requiring extended operating temperature range (up to 175°C)
Higher continuous drain current rating (10.8A) provides design margin
Active product status with established supply chain
RoHS3 compliance and PowerTrench® technology platform
Comparable on-resistance and power dissipation characteristics

FDS5670 Selection Criteria:

Applicable for designs requiring higher voltage headroom (60V vs. 40V)
Maintains 10A continuous drain current specification
Active product status with high inventory availability (21,071 pcs)
RoHS3 compliant with PowerTrench® series reliability
Suitable for applications with voltage transient protection requirements

All three substitute parts maintain identical 8-SOIC surface mount packaging, MSL rating of 1 (Unlimited), and REACH compliance status. Selection between substitutes depends on specific application requirements for thermal performance, temperature range, or voltage margin.

Frequently Asked Questions (FAQ)

Q: Can AO4484 directly replace IRF7471PBF in existing PCB designs?

A: Yes. The AO4484 maintains identical 8-SOIC package dimensions (0.154" width, 3.90mm), surface mount configuration, and pinout compatibility. No PCB layout modifications are required. The improved on-resistance (10mOhm vs. 13mOhm) and reduced power dissipation (1.7W vs. 2.5W) provide performance benefits without design changes.

Q: What is the primary difference between FDS4480 and FDS5670?

A: The FDS4480 is rated for 40V Vdss with 10.8A continuous drain current, matching the IRF7471PBF voltage specification. The FDS5670 is rated for 60V Vdss with 10A continuous drain current. Both use identical 8-SOIC packaging. Select FDS4480 for voltage-matched applications; select FDS5670 when higher voltage margin is required.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. AO4484, FDS4480, and FDS5670 are all RoHS3 compliant. The original IRF7471PBF is REACH Unaffected. All substitute parts meet modern environmental and regulatory standards for manufacturing and distribution.

Q: What is the impact of gate charge differences on circuit design?

A: Gate charge (Qg) affects gate drive circuit design and switching speed. IRF7471PBF specifies 32nC @ 4.5V. Substitutes show higher values: AO4484 (37nC @ 10V), FDS4480 (41nC @ 10V), and FDS5670 (70nC @ 10V). Higher gate charge requires proportionally higher gate drive current for equivalent switching speed. Verify gate driver capability before selection.

Q: Can FDS5670 be used in a 40V application?

A: Yes. The FDS5670 is rated for 60V Vdss, which exceeds the 40V requirement of the IRF7471PBF application. This provides additional voltage margin for transient protection. However, the higher gate charge (70nC) requires verification of gate driver compatibility. On-resistance is slightly higher (14mOhm vs. 13mOhm), resulting in marginally increased power dissipation.

Q: What is the moisture sensitivity level (MSL) rating, and why is it important?

A: All parts, including IRF7471PBF and substitutes, carry MSL rating 1 (Unlimited). This indicates unlimited shelf life without moisture bake-out requirements. No special storage or handling procedures are necessary for these components.

Q: Are there any thermal management differences between substitute parts?

A: Yes. AO4484 has the lowest power dissipation (1.7W), reducing thermal load on the PCB. FDS4480 and FDS5670 both specify 2.5W, matching the original IRF7471PBF. FDS4480 supports extended operating temperature to 175°C, providing thermal margin in high-temperature environments. Thermal design should account for these differences in power dissipation specifications.

Q: What inventory status should influence part selection?

A: AO4484 has 12,300 pcs in stock, FDS4480 has 4,631 pcs, and FDS5670 has 21,071 pcs available. All three substitutes are active products with established supply chains. FDS5670 offers the highest immediate availability. For long-term production, all three are suitable; verify supplier lead times and allocation policies for your specific volume requirements.

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