FDWS9408-F085 Equivalent & Substitute Parts

Part Overview

The FDWS9408-F085 is an N-Channel MOSFET manufactured by onsemi, rated for 40V drain-to-source voltage with 80A continuous drain current at 25°C case temperature. This device is housed in a Power56 package (8-PowerTDFN) and is designed for surface mount applications requiring high current switching capability.

The FDWS9408-F085 carries an Obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Substiute Parts

FDWS9408-F085

onsemiIn Stock: 980FDWS9408-F085 Datasheet

Current PartRFQ

NVMFS5C430NAFT1G

onsemiIn Stock: 16284NVMFS5C430NAFT1G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDWS9408-F085 is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain the 40V Vdss specification to ensure safe operation within the same voltage domain.

Current Capability: The substitute must support equivalent or superior continuous drain current performance at 25°C case temperature to handle the same load conditions.

On-State Resistance: The Rds On specification directly impacts power dissipation and thermal performance. Substitute parts must maintain comparable or lower on-state resistance to preserve circuit efficiency.

Gate Characteristics: Gate threshold voltage and gate charge specifications must remain within compatible ranges to ensure proper gate drive circuit operation without modification.

Package Compatibility: The substitute must be compatible with the existing PCB layout and thermal management design. Surface mount packages with equivalent or superior thermal performance are acceptable.

Temperature Range: The operating temperature specification must encompass the full -55°C to 175°C range required by the original design.

Compliance: RoHS3 compliance and REACH unaffected status must be maintained for regulatory adherence.

The NVMFS5C430NAFT1G qualifies as a substitute based on matching voltage rating, compatible current specifications, comparable on-state resistance, and equivalent operating temperature range, while maintaining all required compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The NVMFS5C430NAFT1G is an active product substitute for the obsolete FDWS9408-F085. Both devices are manufactured by onsemi and share identical voltage ratings (40V Vdss) and compatible current specifications. The substitute maintains equivalent on-state resistance performance (1.7 mOhm versus 1.8 mOhm) and supports the full operating temperature range (-55°C to 175°C).

The NVMFS5C430NAFT1G carries Active product status, ensuring ongoing availability and manufacturer support. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production continuity.

The substitute device features lower gate charge (47 nC versus 92 nC) and reduced input capacitance (3300 pF versus 5150 pF), which may improve gate drive efficiency and reduce switching losses in applications with current-limited gate drive circuits.

The NVMFS5C430NAFT1G is qualified to AEC-Q101 automotive standards, providing additional qualification assurance beyond the base MOSFET specifications.

Frequently Asked Questions (FAQ)

Q: Can the NVMFS5C430NAFT1G directly replace the FDWS9408-F085 without PCB modifications?

A: The NVMFS5C430NAFT1G is housed in an 8-PowerTDFN package with 5 leads, while the FDWS9408-F085 uses an 8-PowerTDFN package. Verification of pinout compatibility and PCB footprint alignment is required before implementation. Thermal performance characteristics may differ due to package variations.

Q: What is the significance of the lower gate charge specification in the substitute part?

A: The NVMFS5C430NAFT1G exhibits 47 nC gate charge compared to 92 nC in the original part. Lower gate charge reduces the energy required to switch the device and may decrease switching losses. Gate drive circuits designed for the original part will operate with improved efficiency margins using the substitute.

Q: Are there differences in continuous current ratings between these parts?

A: The FDWS9408-F085 is rated for 80A continuous drain current at 25°C case temperature. The NVMFS5C430NAFT1G is rated for 35A at 25°C ambient temperature and 185A at 25°C case temperature. The case temperature rating of the substitute exceeds the original specification, supporting equivalent or superior performance in thermally managed applications.

Q: Does the substitute part require different gate drive voltage levels?

A: Both parts operate with 10V drive voltage for maximum on-state resistance specification. The gate threshold voltage of the substitute (3.5V) is lower than the original (4V), indicating slightly faster turn-on response. Existing gate drive circuits designed for the FDWS9408-F085 are compatible with the NVMFS5C430NAFT1G.

Q: What compliance certifications apply to the substitute part?

A: The NVMFS5C430NAFT1G maintains ROHS3 compliance and REACH unaffected status, matching the original part. Additionally, the substitute carries AEC-Q101 automotive qualification, providing enhanced reliability assurance for applications requiring automotive-grade components.

Q: Is the substitute part available in higher quantities than the original?

A: The NVMFS5C430NAFT1G is an active product with 16,200 pieces in stock inventory, compared to 919 pieces of the obsolete FDWS9408-F085. The substitute offers superior supply chain availability and long-term procurement security.