FDH5500-F085 Equivalent & Substitute Parts

Part Overview

The FDH5500-F085 is an N-Channel MOSFET manufactured by onsemi, rated for 55V drain-to-source voltage and 75A continuous drain current in a TO-247-3 through-hole package. This device is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and maintenance applications. The part operates across an automotive-grade temperature range of -55°C to 175°C and carries AEC-Q101 qualification.

Substiute Parts

FDH5500-F085

onsemiIn Stock: 1129FDH5500-F085 Datasheet

Current PartRFQ

IRFP054NPBF

Infineon TechnologiesIn Stock: 19389IRFP054NPBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDH5500-F085 is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute must maintain the 55V Vdss rating to ensure safe operation within the same voltage domain.

Current Handling Capability: The substitute must support continuous drain current at or above 75A to fulfill the original design current requirements.

On-State Resistance (Rds On): The substitute's Rds On must not exceed the original specification to prevent excessive power dissipation and thermal stress in the circuit.

Package and Mounting: The substitute must use a through-hole package compatible with TO-247-3 footprints to ensure mechanical and electrical compatibility with existing PCB designs.

Temperature Range: The substitute must operate across the full -55°C to 175°C range to maintain performance in automotive and industrial environments.

Gate Charge and Input Capacitance: These parameters influence switching speed and gate drive requirements; substitutes with comparable values ensure consistent circuit performance.

The IRFP054NPBF meets these substitution criteria through equivalent voltage rating, comparable current capability, and compatible through-hole packaging.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FDH5500-F085 is classified as Obsolete, making the IRFP054NPBF a necessary alternative for continued supply. The IRFP054NPBF carries a "Not For New Designs" status, indicating limited future availability; however, it remains suitable for sustaining production of existing designs.

Compliance and Certification: Both devices are REACH Unaffected and classified under ECCN EAR99. The FDH5500-F085 holds AEC-Q101 automotive qualification. The IRFP054NPBF is RoHS3 Compliant, meeting modern environmental standards.

Electrical Equivalence: The IRFP054NPBF provides equivalent voltage rating (55V) and exceeds the continuous drain current requirement (81A vs. 75A). Gate threshold voltage and maximum gate voltage are identical, ensuring compatible gate drive circuits.

Thermal and Power Considerations: The FDH5500-F085 specifies 375W maximum power dissipation, while the IRFP054NPBF specifies 170W. This difference reflects different thermal measurement conditions (Tc) and package thermal characteristics. Circuit designers must evaluate thermal management requirements based on actual application duty cycles and heat-sinking provisions.

Package Compatibility: Both devices use through-hole TO-247 packages. The FDH5500-F085 uses TO-247-3, while the IRFP054NPBF uses TO-247AC. These packages share identical pin configurations and footprints, enabling direct PCB substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the IRFP054NPBF directly replace the FDH5500-F085 in existing designs?

A: Yes. Both devices share identical voltage ratings (55V), compatible current ratings (81A vs. 75A), matching gate threshold voltages (4V), and identical maximum gate voltages (±20V). The TO-247-3 and TO-247AC packages are mechanically and electrically interchangeable on standard through-hole PCBs.

Q: What is the significance of the different Rds On specifications?

A: The FDH5500-F085 specifies 7 mOhm at 75A and 10V, while the IRFP054NPBF specifies 12 mOhm at 43A and 10V. These measurements are taken at different current levels. The IRFP054NPBF's lower gate charge (130 nC vs. 268 nC) and input capacitance (2900 pF vs. 3565 pF) indicate faster switching characteristics, which may result in lower switching losses in high-frequency applications.

Q: Why do the power dissipation ratings differ significantly?

A: Power dissipation ratings reflect thermal measurement conditions and package thermal resistance. The FDH5500-F085 specifies 375W while the IRFP054NPBF specifies 170W. These values are not directly comparable without understanding the specific thermal test conditions. Actual power dissipation in an application depends on Rds On, operating current, and duty cycle, not the rated maximum.

Q: Are there any compliance or qualification differences?

A: The FDH5500-F085 carries AEC-Q101 automotive qualification. The IRFP054NPBF is RoHS3 Compliant. Both are REACH Unaffected. For automotive applications requiring AEC-Q101 certification, the FDH5500-F085 is the qualified part; the IRFP054NPBF is suitable for non-automotive or less stringent applications.

Q: What is the difference between TO-247-3 and TO-247AC packages?

A: Both are through-hole TO-247 variants with identical pin configurations and footprints. TO-247-3 and TO-247AC are mechanically and electrically compatible for PCB mounting and do not require design changes.

Q: Is the IRFP054NPBF suitable for new designs?

A: The IRFP054NPBF carries a "Not For New Designs" status, indicating limited future availability. For new designs, alternative N-Channel MOSFETs with 55V rating and comparable current ratings should be evaluated. This part is appropriate for sustaining production of existing designs where the FDH5500-F085 is no longer available.