FDMS9408-F085 Equivalent & Substitute Parts

Part Overview

The FDMS9408-F085 is an N-Channel 40V 80A Power56 MOSFET manufactured by onsemi, designed for high-current power switching applications. This device features a PowerTrench® technology platform with a maximum drain-source voltage of 40V and continuous drain current rating of 80A at 25°C case temperature. The part carries Automotive grade qualification (AEC-Q101) and is RoHS3 compliant.

The FDMS9408-F085 is classified as Obsolete. Identifying 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

FDMS9408-F085

onsemiIn Stock: 5607FDMS9408-F085 Datasheet

Current PartRFQ

NVMFS5C430NAFT1G

onsemiIn Stock: 16284NVMFS5C430NAFT1G Datasheet

SimilarRFQ

PJQ5440-AU_R2_000A1

Panjit International Inc.In Stock: 7126PJQ5440-AU_R2_000A1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMS9408-F085 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Drain to Source Voltage (Vdss): Must equal or exceed 40V
• Continuous Drain Current (Id): Must support the application's current requirements
• On-Resistance (Rds On): Lower values indicate improved efficiency; values within acceptable range for thermal performance
• Gate Threshold Voltage (Vgs(th)): Must be compatible with gate drive circuitry
• Operating Temperature Range: Must span -55°C to 175°C minimum

Mechanical & Compliance Criteria:

• Mounting Type: Surface Mount required
• Grade: Automotive qualification (AEC-Q101) required
• RoHS Status: ROHS3 Compliant required
• Moisture Sensitivity Level: MSL 1 (Unlimited) required

The substitute parts identified below meet these core substitution criteria while maintaining functional equivalence within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

NVMFS5C430NAFT1G (onsemi)

This substitute maintains the same 40V Vdss rating and offers superior case temperature drain current capability (185A Tc) compared to the FDMS9408-F085 (80A Tc). The on-resistance of 1.7 mOhm at 50A is lower than the original part's 1.8 mOhm at 80A, indicating improved efficiency characteristics. The NVMFS5C430NAFT1G carries Active product status, ensuring long-term availability and supply continuity. It holds identical Automotive grade qualification (AEC-Q101), RoHS3 compliance, and MSL 1 rating. The package type differs (8-PowerTDFN, 5 Leads versus 8-PowerVDFN), requiring PCB layout verification. This part is suitable for applications requiring equivalent or higher current handling with improved thermal performance.

PJQ5440-AU_R2_000A1 (Panjit International Inc.)

This substitute maintains the same 40V Vdss rating and offers case temperature drain current capability of 100A (Tc), which exceeds the FDMS9408-F085 rating of 80A (Tc). The on-resistance of 2.8 mOhm at 20A is higher than the original part, resulting in increased power dissipation under equivalent current conditions. The PJQ5440-AU_R2_000A1 carries Active product status with Automotive grade qualification (AEC-Q101), RoHS3 compliance, and MSL 1 rating. The package type is identical (8-PowerVDFN), simplifying PCB integration. This part is suitable for applications where package compatibility is critical and slightly elevated on-resistance is acceptable.

Both substitute parts satisfy the mandatory compliance and qualification requirements. Selection between them depends on thermal performance requirements, package constraints, and current handling specifications of the target application.

Frequently Asked Questions (FAQ)

Q: What makes a part a valid substitute for the FDMS9408-F085?

A: A valid substitute must meet all of the following criteria: (1) Drain to Source Voltage (Vdss) of 40V or higher, (2) Continuous Drain Current (Id) sufficient for the application, (3) Surface Mount mounting type, (4) Automotive grade with AEC-Q101 qualification, (5) RoHS3 compliance, and (6) MSL 1 rating. The substitute must also operate across the -55°C to 175°C temperature range.

Q: Can I use NVMFS5C430NAFT1G as a direct replacement without PCB modifications?

A: The NVMFS5C430NAFT1G has a different package type (8-PowerTDFN, 5 Leads) compared to the FDMS9408-F085 (8-PowerVDFN). PCB layout verification is required to confirm pad compatibility and thermal performance. Consult the respective datasheets for detailed package dimensions and pin configurations.

Q: What is the difference in on-resistance between the substitute parts and the original?

A: The NVMFS5C430NAFT1G has an on-resistance of 1.7 mOhm at 50A (10V), which is lower than the FDMS9408-F085 at 1.8 mOhm at 80A (10V). The PJQ5440-AU_R2_000A1 has an on-resistance of 2.8 mOhm at 20A (10V), which is higher. Lower on-resistance reduces power dissipation and heat generation during operation.

Q: Are both substitute parts available in the same quantities as the original?

A: The NVMFS5C430NAFT1G has 16,200 pieces in stock, and the PJQ5440-AU_R2_000A1 has 7,105 pieces in stock. Both exceed typical component availability levels. The FDMS9408-F085, being Obsolete, has limited remaining inventory of 5,541 pieces.

Q: Do the substitute parts have the same gate charge characteristics?

A: No. The FDMS9408-F085 has a gate charge of 92 nC at 10V. The NVMFS5C430NAFT1G has 47 nC at 10V (lower), and the PJQ5440-AU_R2_000A1 has 50 nC at 4.5V. Lower gate charge reduces gate drive power requirements and switching losses.

Q: What is the impact of different input capacitance values?

A: The FDMS9408-F085 has input capacitance of 5120 pF at 25V. The NVMFS5C430NAFT1G has 3300 pF (lower), and the PJQ5440-AU_R2_000A1 has 5214 pF (similar). Lower input capacitance reduces gate drive circuit complexity and improves switching speed.

Q: Are all parts qualified for automotive applications?

A: Yes. All three parts carry Automotive grade classification with AEC-Q101 qualification, RoHS3 compliance, and MSL 1 rating, making them suitable for automotive and industrial applications requiring equivalent reliability standards.