FDMS9408L-F085 Equivalent & Substitute Parts

Part Overview

The FDMS9408L-F085 is an N-Channel 40V 80A Power MOSFET manufactured by onsemi, designed for high-current power switching applications. This device features the PowerTrench® technology platform and is housed in a Power56 surface mount package. The part carries Automotive grade qualification (AEC-Q101) and is RoHS3 compliant.

The FDMS9408L-F085 is classified as Obsolete. Identifying equivalent 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

FDMS9408L-F085

onsemiIn Stock: 1097FDMS9408L-F085 Datasheet

Current PartRFQ

NVMFS5C430NLAFT1G

onsemiIn Stock: 15848NVMFS5C430NLAFT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDMS9408L-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 capability must support the application's current requirements
• On-resistance (Rds On) characteristics must be compatible with thermal and efficiency constraints
• Gate threshold voltage and gate charge must be compatible with the drive circuit
• Operating temperature range must encompass -55°C to 175°C (TJ)

Mechanical Compatibility Criteria:

• Surface mount package configuration
• Automotive grade qualification (AEC-Q101)
• RoHS3 compliance
• Moisture sensitivity level MSL 1 (Unlimited)

The NVMFS5C430NLAFT1G qualifies as a substitute based on matching Vdss (40V), automotive qualification (AEC-Q101), surface mount configuration, RoHS3 compliance, and compatible operating temperature range. While the NVMFS5C430NLAFT1G exhibits different package geometry (5-DFN versus Power56) and lower continuous drain current at ambient temperature (38A Ta versus 80A Tc), it maintains electrical parameter compatibility within the specified voltage and temperature operating envelope.

Parameter Comparison

Engineering Selection Recommendations

NVMFS5C430NLAFT1G as Primary Substitute:

The NVMFS5C430NLAFT1G is the designated substitute for the obsolete FDMS9408L-F085. Both devices share identical Vdss (40V), matching automotive qualification (AEC-Q101), and compatible operating temperature ranges (-55°C to 175°C TJ). Both maintain RoHS3 compliance and MSL 1 moisture sensitivity classification.

The NVMFS5C430NLAFT1G carries Active product status, ensuring ongoing availability and manufacturing support. This substitution addresses the obsolescence of the FDMS9408L-F085 while maintaining electrical parameter compatibility within the specified voltage and temperature operating envelope.

Package Transition Consideration:

The substitution requires a package transition from Power56 (8-PowerVDFN) to 5-DFN (8-PowerTDFN, 5 Leads). This transition necessitates PCB layout modification and thermal management evaluation. The NVMFS5C430NLAFT1G exhibits lower gate charge (70 nC versus 110 nC) and reduced input capacitance (4300 pF versus 5750 pF), which may improve switching performance and reduce drive circuit loading.

Current Rating Evaluation:

The NVMFS5C430NLAFT1G specifies 38A continuous drain current at ambient temperature (Ta) and 200A at case temperature (Tc). The original FDMS9408L-F085 specifies 80A at case temperature (Tc). Application-specific thermal analysis is required to determine whether the NVMFS5C430NLAFT1G meets continuous current requirements under the intended operating conditions.

Frequently Asked Questions (FAQ)

Q: Why is the FDMS9408L-F085 being discontinued?

A: The FDMS9408L-F085 is classified as Obsolete. The NVMFS5C430NLAFT1G is the designated substitute, offering active product status and improved availability.

Q: Are the voltage ratings identical between the two devices?

A: Yes. Both the FDMS9408L-F085 and NVMFS5C430NLAFT1G feature identical Drain to Source Voltage (Vdss) of 40V, ensuring voltage compatibility in the application circuit.

Q: What is the primary difference between these two MOSFETs?

A: The primary differences are package geometry (Power56 versus 5-DFN), continuous drain current specifications at ambient temperature (80A Tc versus 38A Ta), and gate charge characteristics (110 nC versus 70 nC). Both devices maintain identical voltage ratings and operating temperature ranges.

Q: Will the NVMFS5C430NLAFT1G require PCB layout changes?

A: Yes. The package transition from Power56 (8-PowerVDFN) to 5-DFN (8-PowerTDFN, 5 Leads) requires PCB footprint modification and thermal management re-evaluation.

Q: Are both devices automotive qualified?

A: Yes. Both the FDMS9408L-F085 and NVMFS5C430NLAFT1G carry Automotive grade qualification (AEC-Q101) and are RoHS3 compliant.

Q: How do the on-resistance characteristics compare?

A: The FDMS9408L-F085 specifies Rds On (Max) of 1.7 mOhm at 80A and 10V. The NVMFS5C430NLAFT1G specifies Rds On (Max) of 1.4 mOhm at 50A and 10V. The lower on-resistance of the substitute may reduce conduction losses in the application.

Q: What is the impact of lower gate charge on the drive circuit?

A: The NVMFS5C430NLAFT1G exhibits gate charge of 70 nC at 10V, compared to 110 nC for the FDMS9408L-F085. Lower gate charge reduces drive circuit loading and may improve switching speed, but the drive circuit must remain compatible with the lower gate threshold voltage (2V versus 3V).

Q: Are the moisture sensitivity levels equivalent?

A: Yes. Both devices are classified as MSL 1 (Unlimited), indicating identical moisture sensitivity handling requirements.