FDBL9403L-F085 N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDBL9403L-F085 is an N-Channel 40V MOSFET manufactured by onsemi in an 8-HPSOF surface mount package. This device is rated for 53.3A continuous drain current at 25°C and features a maximum on-resistance of 0.72mOhm at 80A and 10V gate-source voltage. The part is qualified to AEC-Q101 automotive standards and operates across a temperature range of -55°C to 175°C.

The FDBL9403L-F085 is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing production requirements, design updates, or inventory replenishment where original stock is unavailable or depleted.

Substiute Parts

FDBL9403L-F085

onsemiIn Stock: 977FDBL9403L-F085 Datasheet

Current PartRFQ

FDBL9403-F085T6

onsemiIn Stock: 1140FDBL9403-F085T6 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDBL9403L-F085 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Functional Performance Parameters:

• Continuous Drain Current (Id) @ 25°C
• On-Resistance (Rds On)
• Gate Threshold Voltage (Vgs(th))
• Gate Charge (Qg)
• Input Capacitance (Ciss)
• Power Dissipation capability

The substitute part FDBL9403-F085T6 shares the same base product number (FDBL9403), voltage rating, package type, and automotive qualification. Both devices are manufactured by onsemi and operate within identical temperature ranges. The primary differences are in packaging format (Cut Tape vs. Tape & Reel), product status (Obsolete vs. Active), and minor variations in electrical performance specifications.

Parameter Comparison

Engineering Selection Recommendations

FDBL9403-F085T6 as Primary Substitute:

The FDBL9403-F085T6 is the direct substitute for the obsolete FDBL9403L-F085. Both devices share identical voltage ratings (40V Vdss), package geometry (8-HPSOF), and automotive qualification (AEC-Q101). The substitute part is currently in active production status with confirmed inventory availability.

Compliance Considerations:

The FDBL9403L-F085 is RoHS non-compliant, while the FDBL9403-F085T6 is ROHS3 compliant. For applications subject to RoHS directives or customer requirements mandating RoHS compliance, the substitute part satisfies these regulatory requirements.

Electrical Performance:

The FDBL9403-F085T6 exhibits slightly higher on-resistance (0.95mOhm vs. 0.72mOhm) and gate threshold voltage (4V vs. 3V) compared to the original part. Gate charge is reduced (108nC vs. 203nC), and input capacitance is lower (6985pF vs. 14100pF). These differences result in reduced switching losses and improved gate drive efficiency in the substitute device.

Packaging Format:

The original part is supplied in Cut Tape (CT) & Digi-Reel format, while the substitute is supplied in Tape & Reel (TR) format. Both formats are compatible with standard surface mount assembly equipment.

Frequently Asked Questions (FAQ)

Q: Can the FDBL9403-F085T6 directly replace the FDBL9403L-F085 in existing designs?

A: Yes. Both devices are N-Channel MOSFETs with identical 40V voltage ratings, 8-HPSOF package geometry, and AEC-Q101 automotive qualification. The electrical performance differences are minor and within acceptable tolerances for most applications. Verification of on-resistance and gate charge specifications against circuit requirements is necessary for designs with tight performance margins.

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

A: The FDBL9403-F085T6 has a higher maximum on-resistance (0.95mOhm vs. 0.72mOhm at rated conditions), higher gate threshold voltage (4V vs. 3V), lower gate charge (108nC vs. 203nC), and lower input capacitance (6985pF vs. 14100pF). These differences favor reduced switching losses and improved gate drive efficiency in the substitute part.

Q: Are the package dimensions identical between these parts?

A: Yes. Both parts use the 8-HPSOF package, which corresponds to the 8-PowerSFN case outline. The physical dimensions, pin configuration, and PCB footprint are identical.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging supplies components on tape that is cut into individual strips, suitable for manual handling or small-volume assembly. Tape & Reel (TR) packaging supplies components on continuous tape wound on a reel, optimized for high-volume automated assembly. Both formats are compatible with standard surface mount assembly processes.

Q: Does the FDBL9403-F085T6 meet RoHS requirements?

A: Yes. The FDBL9403-F085T6 is ROHS3 compliant. The original FDBL9403L-F085 is RoHS non-compliant. For applications requiring RoHS compliance, the substitute part satisfies these requirements.

Q: Are both parts qualified to the same automotive standard?

A: Yes. Both the FDBL9403L-F085 and FDBL9403-F085T6 are qualified to AEC-Q101, the automotive-grade reliability standard for discrete semiconductors.

Q: What is the continuous drain current rating difference?

A: The FDBL9403L-F085 is rated for 53.3A continuous drain current (Tc) at 25°C. The FDBL9403-F085T6 is rated for 50A (Ta) or 300A (Tc) at 25°C. The Ta rating (50A) represents the ambient temperature condition, while the Tc rating (300A) represents the case temperature condition. For direct comparison under identical test conditions, the substitute part provides comparable performance.