IRF7484PBF N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The IRF7484PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 40V drain-to-source voltage with 14A continuous drain current at 25°C. This device is part of the HEXFET® series and is designed for surface mount applications in 8-SOIC packaging. The IRF7484PBF is classified as obsolete, making identification of functionally equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

IRF7484PBF

Infineon TechnologiesIn Stock: 749IRF7484PBF Datasheet

Current PartRFQ

FDS4470

Fairchild SemiconductorIn Stock: 25117FDS4470 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF7484PBF is determined by strict alignment of electrical and mechanical parameters within the N-Channel MOSFET category. The following criteria establish substitution validity:

Electrical Compatibility Requirements:

• FET Type: N-Channel (mandatory match)
• Drain to Source Voltage (Vdss): 40 V (exact match required)
• Continuous Drain Current (Id): Equal to or greater than 14 A
• Power Dissipation (Max): Equal to or greater than 2.5 W
• Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Mechanical Compatibility Requirements:

• Mounting Type: Surface Mount (mandatory match)
• Package / Case: 8-SOIC form factor with 0.154" (3.90mm) width (mandatory match)

Compliance and Status:

• ECCN and HTSUS classifications must align for regulatory continuity

The FDS4470 from Fairchild Semiconductor meets these substitution criteria as a functionally equivalent alternative.

Parameter Comparison

Engineering Selection Recommendations

IRF7484PBF (Infineon Technologies):

• Product Status: Obsolete
• Availability: 680 Pcs in stock (limited supply)
• Moisture Sensitivity Level: 1 (Unlimited)
• Suitable for: Legacy system maintenance and existing inventory replenishment only

FDS4470 (Fairchild Semiconductor):

• Product Status: Active
• Availability: 25,100 Pcs in stock (robust supply)
• Moisture Sensitivity Level: Not specified in provided data
• Suitable for: New designs, production continuity, and long-term procurement

The FDS4470 is the primary substitute for the IRF7484PBF. Both devices share identical voltage ratings, thermal dissipation limits, and package form factors. The FDS4470 operates at a lower continuous drain current (12.5A versus 14A); therefore, circuit designs must confirm that actual operating current does not exceed 12.5A. The FDS4470's active product status and significantly higher inventory availability provide superior long-term supply chain reliability compared to the obsolete IRF7484PBF.

Frequently Asked Questions (FAQ)

Q: Can the FDS4470 directly replace the IRF7484PBF in all applications?

A: Direct replacement is valid only if the circuit's maximum continuous drain current does not exceed 12.5A. The IRF7484PBF is rated for 14A continuous drain current, while the FDS4470 is rated for 12.5A. Both devices share identical 40V voltage ratings, 2.5W power dissipation limits, and 8-SOIC packaging. Circuit analysis must confirm current compliance before substitution.

Q: Are the gate drive voltage requirements different between these parts?

A: Yes. The IRF7484PBF specifies a drive voltage of 7V for maximum Rds On specification, while the FDS4470 specifies 10V. Both devices have identical maximum gate-source voltage ratings (±8V for IRF7484PBF; +30V, -20V for FDS4470). Gate drive circuits must be verified to supply the appropriate voltage for the selected device.

Q: Do these devices have identical thermal operating ranges?

A: No. The IRF7484PBF operates from -55°C to 150°C junction temperature, while the FDS4470 operates from -55°C to 175°C. The FDS4470 provides a 25°C higher upper temperature limit, which may be advantageous in thermally constrained applications.

Q: Are the packages physically identical?

A: Yes. Both the IRF7484PBF and FDS4470 use 8-SOIC packaging with 0.154" (3.90mm) width. PCB footprints are identical, and no layout modifications are required for mechanical substitution.

Q: What is the difference in on-state resistance between these devices?

A: The IRF7484PBF specifies 10 mOhm maximum on-state resistance at 14A and 7V gate-source voltage. The FDS4470 specifies 9 mOhm maximum on-state resistance at 12.5A and 10V gate-source voltage. The FDS4470 exhibits lower on-resistance at its rated current, resulting in reduced power dissipation in switching applications.

Q: Why is the IRF7484PBF classified as obsolete?

A: The IRF7484PBF is listed as obsolete by Infineon Technologies. Obsolete status indicates the manufacturer has discontinued production and support. Current inventory (680 Pcs) represents remaining stock only. The FDS4470 is an active product with ongoing manufacturer support and significantly higher availability (25,100 Pcs).