IRF7477 N-Channel MOSFET 30V 14A Equivalent & Substitute Parts

Part Overview

The IRF7477 is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 30V drain-to-source voltage with 14A continuous drain current at 25°C. This device is part of the HEXFET® series and is packaged in an 8-SO surface mount configuration. The IRF7477 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, thermal characteristics, and package dimensions while meeting modern compliance standards.

Key Parameters

Parameter	Value	Unit
Drain-to-Source Voltage (Vdss)	30	V
Continuous Drain Current (Id) @ 25°C	14	A
On-State Resistance (Rds On) @ 14A, 10V	8.5	mOhm
Gate Threshold Voltage (Vgs(th)) @ 250µA	2.5	V
Power Dissipation (Max)	2.5	W
Operating Temperature Range	-55 to 150	°C
Package Type	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitute parts for the IRF7477 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Drain-to-Source Voltage (Vdss): Must equal 30V
Continuous Drain Current (Id): Must be ≥14A at 25°C
Package Type: Must be 8-SOIC or equivalent 8-pin surface mount
Operating Temperature Range: Must support -55°C to 150°C
On-State Resistance (Rds On): Lower values indicate improved performance but higher values remain acceptable if within thermal limits
Gate Threshold Voltage (Vgs(th)): Must be compatible with 4.5V and 10V drive voltages

Substitution Logic: Parts are grouped as direct substitutes when all critical parameters match or exceed the IRF7477 specifications. Drain current may be lower than 14A if the application does not require the full 14A rating, but parts with equal or higher current ratings provide greater design margin. On-state resistance variations are acceptable provided thermal dissipation remains within the 2.5W maximum power rating under actual operating conditions.

Parameter Comparison

Part Number	Manufacturer	Vdss (V)	Id @ 25°C (A)	Rds On @ 10V (mOhm)	Vgs(th) @ 250µA (V)	Power Dissipation (W)	Operating Temp (°C)	Package	Product Status
IRF7477	Infineon Technologies	30	14	8.5	2.5	2.5	-55 to 150	8-SOIC	Obsolete
FDS6680A	onsemi	30	12.5	9.5	3.0	2.5	-55 to 150	8-SOIC	Active
FDS8880	onsemi	30	11.6	10.0	2.5	2.5	-55 to 150	8-SOIC	Active
RSS140N03TB	Rohm Semiconductor	30	14	6.7	2.5	2.0	-55 to 150	8-SOIC	Active
SI4430BDY-T1-E3	Vishay Siliconix	30	14	4.5	3.0	1.6	-55 to 150	8-SOIC	Active
SI4430BDY-T1-GE3	Vishay Siliconix	30	14	4.5	3.0	1.6	-55 to 150	8-SOIC	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SI4430BDY-T1-E3 and SI4430BDY-T1-GE3 (Vishay Siliconix TrenchFET®) provide the closest electrical match to the IRF7477. Both parts maintain 30V Vdss, 14A continuous drain current, and identical operating temperature range. These devices feature superior on-state resistance (4.5 mOhm vs. 8.5 mOhm), resulting in lower power dissipation (1.6W vs. 2.5W). Both are RoHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Secondary Substitutes (Acceptable with Design Verification):

RSS140N03TB (Rohm Semiconductor) matches the IRF7477 in Vdss, Id, and Vgs(th). This part offers improved on-state resistance (6.7 mOhm) and lower power dissipation (2.0W). RoHS3 compliance and active status support modern manufacturing requirements. Inventory availability is lower than Vishay options.

FDS6680A and FDS8880 (onsemi PowerTrench®) are active alternatives with 30V Vdss and 2.5W power dissipation matching the original part. FDS6680A provides 12.5A continuous current with 9.5 mOhm on-state resistance. FDS8880 provides 11.6A continuous current with 10 mOhm on-state resistance. Both are RoHS3 compliant. These parts are suitable for applications where drain current requirements are ≤12.5A.

Compliance Considerations:

All recommended substitutes are RoHS3 compliant, addressing regulatory requirements for new designs. The IRF7477 is RoHS non-compliant, making substitution necessary for applications subject to RoHS directives. All substitute parts maintain REACH unaffected status and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use FDS6680A or FDS8880 as direct replacements for IRF7477 in all applications?

A: FDS6680A and FDS8880 are suitable substitutes only if your application does not require the full 14A continuous drain current of the IRF7477. FDS6680A provides 12.5A and FDS8880 provides 11.6A. Both maintain 30V Vdss, identical operating temperature range, and 2.5W power dissipation. Verify that your circuit current requirements do not exceed these ratings before substitution.

Q: What is the difference between SI4430BDY-T1-E3 and SI4430BDY-T1-GE3?

A: Both SI4430BDY-T1-E3 and SI4430BDY-T1-GE3 are electrically identical N-Channel MOSFETs with 30V Vdss and 14A continuous drain current. The primary difference is packaging designation and inventory availability. Both are packaged in 8-SOIC and are suitable for direct substitution of the IRF7477. SI4430BDY-T1-GE3 has lower current inventory (2000 pcs) compared to SI4430BDY-T1-E3 (8068 pcs).

Q: Why does RSS140N03TB have lower on-state resistance than the IRF7477?

A: RSS140N03TB features advanced semiconductor technology that reduces on-state resistance to 6.7 mOhm compared to the IRF7477's 8.5 mOhm. This improvement results in lower power dissipation (2.0W vs. 2.5W) and reduced heat generation. Lower on-state resistance is a performance advantage and does not affect compatibility; the part remains a direct substitute.

Q: Are all substitute parts available in the same 8-SOIC package?

A: Yes. All recommended substitute parts are packaged in 8-SOIC (0.154", 3.90mm Width), matching the IRF7477 package dimensions. This ensures PCB layout compatibility and eliminates the need for board redesign. Surface mount mounting type is identical across all parts.

Q: What is the significance of the gate threshold voltage (Vgs(th)) difference between parts?

A: Gate threshold voltage determines the gate-source voltage required to turn the MOSFET on. The IRF7477 specifies 2.5V @ 250µA, while some substitutes (SI4430BDY-T1-E3, SI4430BDY-T1-GE3, FDS6680A) specify 3.0V @ 250µA. Both values are compatible with standard 4.5V and 10V drive voltages used in typical applications. Verify your gate driver circuit can supply the required voltage before substitution.

Q: Why is the IRF7477 classified as obsolete?

A: The IRF7477 is obsolete due to product lifecycle management by Infineon Technologies. Newer alternatives with improved performance characteristics and better compliance certifications have replaced it. Substitution is necessary for new designs and ongoing production to ensure supply chain continuity and access to active product support.

Q: Can I mix different substitute parts in the same circuit board?

A: All recommended substitutes are electrically compatible and can be used interchangeably in the same application. However, mixing different part numbers on the same board may complicate inventory management and traceability. For production consistency, select a single substitute part and maintain it throughout the product lifecycle.

Q: What thermal considerations apply when substituting the IRF7477?

A: The IRF7477 is rated for 2.5W maximum power dissipation. SI4430BDY-T1-E3 and SI4430BDY-T1-GE3 are rated for 1.6W, while RSS140N03TB is rated for 2.0W. Lower power dissipation ratings indicate improved thermal performance. Verify that your PCB thermal design and heat sinking remain adequate for the substitute part's power dissipation rating under worst-case operating conditions.

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