IRFS7734PBF N-Channel MOSFET 75V 183A Equivalent & Substitute Parts

Part Overview

The IRFS7734PBF is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 75V drain-to-source voltage with 183A continuous drain current at 25°C. This device is housed in a D2PAK (TO-263AB) surface mount package and is part of the HEXFET® and StrongIRFET™ series. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives for ongoing design support and production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the D2PAK package format.

Substiute Parts

IRFS7734PBF

Infineon TechnologiesIn Stock: 891IRFS7734PBF Datasheet

Current PartRFQ

AUIRFS3107TRL

Infineon TechnologiesIn Stock: 1000169AUIRFS3107TRL Datasheet

DirectRFQ

FDB86566-F085

onsemiIn Stock: 1878FDB86566-F085 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IRFS7734PBF is determined by the following critical parameters:

Voltage Rating: Substitute parts must maintain a Vdss rating of 75V or higher to ensure safe operation within the original design envelope.

Current Rating: Continuous drain current (Id) must meet or exceed 183A at 25°C to support the same load conditions.

On-Resistance (Rds On): The maximum on-resistance specification determines power dissipation and thermal performance. Lower Rds On values indicate improved efficiency.

Gate Charge (Qg): Gate charge affects switching speed and driver circuit requirements. Comparable Qg values ensure compatible gate drive characteristics.

Package Compatibility: All substitutes must use the D2PAK (TO-263AB) surface mount package to maintain PCB layout compatibility.

Thermal Performance: Power dissipation capability must support the thermal requirements of the application.

Compliance: RoHS3 compliance and moisture sensitivity level (MSL 1) are mandatory for production equivalence.

Parameter Comparison

Engineering Selection Recommendations

AUIRFS3107TRL (Infineon Technologies): This part is the primary equivalent for the IRFS7734PBF. It maintains the same 75V Vdss rating and exceeds the current requirement with 195A continuous drain current. The on-resistance is improved at 3.0 mOhm, and power dissipation capability is higher at 370W. Gate charge is slightly lower at 240 nC, indicating faster switching characteristics. The part carries ROHS3 compliance and MSL 1 rating. However, the product status is Last Time Buy, indicating limited future availability. This substitute is suitable for direct replacement in applications where the improved thermal performance and current margin are beneficial.

FDB86566-F085 (onsemi): This part is a secondary option with significant trade-offs. The Vdss rating is reduced to 60V, which is below the original 75V specification and unsuitable for applications requiring the full voltage margin. The continuous drain current is 110A, substantially lower than the 183A requirement. The on-resistance is lower at 2.7 mOhm, and gate charge is significantly reduced at 110 nC. Power dissipation is limited to 176W. This part carries AEC-Q101 automotive qualification and ROHS3 compliance. The FDB86566-F085 is classified as Obsolete and should only be considered for applications with reduced voltage and current requirements that do not match the original IRFS7734PBF design envelope.

Compliance and Certification: Both substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and environmental standards. The AUIRFS3107TRL includes automotive-grade qualification (AEC-Q101), providing additional reliability assurance for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the AUIRFS3107TRL directly replace the IRFS7734PBF without circuit modifications?

A: Yes, the AUIRFS3107TRL is a direct replacement. Both parts share the same 75V Vdss rating, D2PAK package, and operating temperature range. The AUIRFS3107TRL provides higher current capacity (195A vs. 183A) and improved on-resistance (3.0 mOhm vs. 3.5 mOhm), making it functionally superior. No circuit modifications are required.

Q: Why is the FDB86566-F085 listed as a substitute if it has lower voltage and current ratings?

A: The FDB86566-F085 is included as a documented substitute from the original part's specification sheet, but it is not recommended for direct replacement in applications requiring the full 75V and 183A specifications. It is suitable only for designs with reduced voltage (60V maximum) and current (110A maximum) requirements. Verify application requirements before selecting this alternative.

Q: What is the significance of the D2PAK package compatibility?

A: The D2PAK (TO-263AB) package is a three-terminal surface mount configuration with two leads and a tab. All listed substitutes use this identical package, ensuring PCB footprint compatibility and eliminating the need for layout redesign. Package compatibility is a mandatory criterion for direct substitution.

Q: How do gate charge differences affect circuit performance?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The IRFS7734PBF requires 270 nC, while the AUIRFS3107TRL requires 240 nC. Lower gate charge reduces driver circuit stress and switching losses. The FDB86566-F085 at 110 nC requires significantly less gate charge, which may require gate driver circuit verification if selected.

Q: What does "Last Time Buy" status mean for the AUIRFS3107TRL?

A: Last Time Buy indicates that the manufacturer has announced end-of-life for this part. Existing inventory may be available, but future production is not guaranteed. For long-term production requirements, secure adequate stock or identify alternative sources before the part becomes unavailable.

Q: Are there thermal performance differences between the substitutes?

A: Yes. The IRFS7734PBF dissipates 290W maximum, the AUIRFS3107TRL dissipates 370W maximum, and the FDB86566-F085 dissipates 176W maximum. Higher power dissipation capability indicates better thermal performance under high-current conditions. The AUIRFS3107TRL provides superior thermal headroom for demanding applications.

Q: Do all substitutes meet the same compliance standards?

A: All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. The AUIRFS3107TRL and FDB86566-F085 both include AEC-Q101 automotive qualification, providing additional reliability assurance. Compliance documentation should be verified with the supplier for specific production batches.