FDWS9420-F085 Equivalent & Substitute Parts

Part Overview

The FDWS9420-F085 is a dual N-channel MOSFET array manufactured by onsemi, rated for 40V drain-to-source voltage and 20A continuous drain current in a surface mount 8-PQFN (5x6) package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal characteristics while accommodating packaging and qualification differences.

Substiute Parts

FDWS9420-F085

onsemiIn Stock: 846FDWS9420-F085 Datasheet

Current PartRFQ

NVMFD5C466NWFT1G

onsemiIn Stock: 1539NVMFD5C466NWFT1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDWS9420-F085 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Drain to Source Voltage (Vdss): Must equal or exceed 40V
• Configuration: Must be dual N-channel (2 N-Channel)
• Operating Temperature Range: Must span -55°C to 175°C (TJ)
• Package Type: Must be 8-PowerTDFN or equivalent 8-pin power package

Performance Considerations:

• Continuous drain current rating determines thermal and power dissipation capability
• On-resistance (Rds On) affects switching losses and thermal performance
• Gate charge and input capacitance influence switching speed and driver requirements

The NVMFD5C466NWFT1G qualifies as a substitute based on matching Vdss (40V), dual N-channel configuration, operating temperature range (-55°C to 175°C), and compatible 8-PowerTDFN package footprint. Differences in current rating, on-resistance, and power dissipation must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

NVMFD5C466NWFT1G as Primary Substitute:

The NVMFD5C466NWFT1G is an active product from onsemi with identical voltage rating (40V Vdss) and dual N-channel configuration. Both components share the same 8-PowerTDFN package footprint and operating temperature range (-55°C to 175°C). Both are ROHS3 compliant with MSL 1 (Unlimited) and REACH Unaffected status.

Key Differences Requiring Application Assessment:

The NVMFD5C466NWFT1G exhibits lower continuous drain current at ambient temperature (14A Ta versus 20A Tc for FDWS9420-F085) but achieves higher current at case temperature (49A Tc). On-resistance is higher at 8.1 mOhm compared to 5.8 mOhm, resulting in increased conduction losses. Gate charge is significantly lower (11 nC versus 43 nC), reducing driver power requirements. Input capacitance is substantially lower (650 pF versus 2100 pF), enabling faster switching transitions.

The NVMFD5C466NWFT1G includes automotive qualification (AEC-Q101), providing additional reliability assurance for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can NVMFD5C466NWFT1G directly replace FDWS9420-F085 in existing designs?

A: Direct replacement is possible from a footprint and voltage perspective, as both components use the 8-PowerTDFN package and share 40V Vdss rating. However, the higher on-resistance (8.1 mOhm versus 5.8 mOhm) increases conduction losses. Thermal analysis of the specific application is required to confirm adequate heat dissipation with the substitute part.

Q: What is the significance of the lower gate charge in NVMFD5C466NWFT1G?

A: Gate charge of 11 nC (versus 43 nC) reduces the energy required to switch the MOSFET on and off. This lowers driver power consumption and enables use of lower-current gate drivers. Existing driver circuits designed for the FDWS9420-F085 will operate with reduced power dissipation when driving the substitute part.

Q: How do the current ratings differ between these parts?

A: The FDWS9420-F085 is rated for 20A continuous drain current at case temperature (Tc). The NVMFD5C466NWFT1G is rated for 14A at ambient temperature (Ta) and 49A at case temperature (Tc). The higher Tc rating reflects improved thermal performance in the substitute part. Application current requirements must be compared against the appropriate temperature condition for the intended use case.

Q: Are there packaging differences between these parts?

A: Both components use the 8-PowerTDFN package with 5x6 mm footprint. The NVMFD5C466NWFT1G is supplied in Tape & Reel (TR) packaging, while the FDWS9420-F085 packaging format is not specified. This difference affects procurement and assembly processes but not PCB layout or electrical compatibility.

Q: What compliance advantages does NVMFD5C466NWFT1G provide?

A: The NVMFD5C466NWFT1G includes AEC-Q101 automotive qualification, indicating compliance with automotive reliability and quality standards. Both parts are ROHS3 compliant, REACH Unaffected, and have MSL 1 (Unlimited) moisture sensitivity rating. The automotive qualification of the substitute part provides additional assurance for applications requiring automotive-grade components.

Q: How does the lower input capacitance affect circuit design?

A: Input capacitance of 650 pF (versus 2100 pF) in the substitute part reduces the capacitive load on the gate driver. This enables faster switching transitions and reduces the time constant in gate drive circuits. Existing gate drive circuits will function with the substitute part, but switching speed will increase, potentially requiring review of EMI performance and switching loss calculations.