FDBL9401L-F085 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDBL9401L-F085 is an N-Channel 40V 300A surface mount MOSFET manufactured by onsemi, part of the PowerTrench® series. This device is designed for high-current switching applications in automotive-grade environments and operates across a temperature range of -55°C to 175°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

FDBL9401L-F085

onsemiIn Stock: 1124FDBL9401L-F085 Datasheet

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FDBL9401-F085T6

onsemiIn Stock: 2157FDBL9401-F085T6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDBL9401L-F085 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Drain to Source Voltage (Vdss): 40V
• Package Type: 8-PowerSFN (8-HPSOF) surface mount
• FET Type: N-Channel
• Technology: MOSFET (Metal Oxide)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 175°C
• Automotive Grade and AEC-Q101 Qualification

Allowable Variation Parameters:

• Continuous Drain Current (Id): Substitute parts may have different current ratings provided they meet or exceed application requirements
• Rds On (Max): Lower on-resistance values are acceptable substitutes
• Gate Charge (Qg): Variations permitted within application switching frequency constraints
• Input Capacitance (Ciss): Variations permitted within gate driver capability
• Power Dissipation: Higher ratings are acceptable substitutes
• Packaging Format: Cut Tape (CT) and Tape & Reel (TR) formats are interchangeable for the same device

The FDBL9401-F085T6 qualifies as a direct substitute based on matching Vdss, package, mounting type, temperature range, and automotive qualification, despite differences in current rating and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The FDBL9401-F085T6 is the designated substitute for the obsolete FDBL9401L-F085. Both devices share identical voltage ratings (40V Vdss), package configuration (8-PowerSFN), mounting technology (surface mount), and automotive qualification (AEC-Q101). The substitute part maintains full compatibility with existing PCB layouts and thermal management designs.

The FDBL9401-F085T6 is currently in active production status, ensuring long-term availability and supply chain continuity. This part carries ROHS3 compliance, whereas the original FDBL9401L-F085 is RoHS non-compliant. Both devices are REACH unaffected and classified under ECCN EAR99.

The substitute exhibits lower continuous drain current (240A vs. 300A at Tc) and reduced power dissipation (180.7W vs. 429W at Tc). Applications requiring the full 300A rating must evaluate whether the 240A capability of the substitute meets circuit requirements. The substitute also demonstrates lower gate charge (148 nC vs. 376 nC) and input capacitance (10000 pF vs. 19550 pF), resulting in faster switching characteristics and reduced gate driver stress.

Both parts are available in Tape & Reel packaging format. The original part was supplied in Cut Tape format; the substitute is supplied in Tape & Reel format, which is standard for high-volume production environments.

Frequently Asked Questions (FAQ)

Q: Can the FDBL9401-F085T6 directly replace the FDBL9401L-F085 in existing designs?

A: Yes, the FDBL9401-F085T6 is a direct substitute. Both devices share identical Vdss (40V), package type (8-PowerSFN), mounting configuration (surface mount), and automotive qualification (AEC-Q101). PCB layouts and thermal designs require no modification.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete vs. active), continuous drain current rating (300A vs. 240A at Tc), power dissipation (429W vs. 180.7W at Tc), gate charge (376 nC vs. 148 nC), input capacitance (19550 pF vs. 10000 pF), and RoHS compliance status (non-compliant vs. ROHS3 compliant). The substitute exhibits improved switching performance due to lower gate charge and capacitance.

Q: Is the packaging format difference between Cut Tape and Tape & Reel significant?

A: No. Both formats contain identical devices. Cut Tape is used for lower-volume or manual assembly operations, while Tape & Reel is standard for automated production. The electrical and thermal characteristics are identical.

Q: Does the lower current rating of the substitute affect thermal performance?

A: The substitute has lower maximum power dissipation (180.7W vs. 429W at Tc), which reduces thermal load on the PCB and thermal management system. Applications operating below 240A continuous current experience improved thermal margins with the substitute.

Q: Are there any compliance or qualification differences?

A: Both parts carry AEC-Q101 automotive qualification and are REACH unaffected. The substitute is ROHS3 compliant, while the original is RoHS non-compliant. Both are classified under ECCN EAR99.

Q: What is the moisture sensitivity level for both parts?

A: Both the FDBL9401L-F085 and FDBL9401-F085T6 have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.

Q: Can I use the substitute in applications requiring the full 300A rating?

A: The substitute is rated for 240A continuous drain current at Tc. Applications requiring sustained current above 240A must evaluate whether the substitute meets circuit requirements or if alternative devices with higher current ratings are necessary.