FDS6812A Equivalent & Substitute Parts

Part Overview

The FDS6812A is a dual N-channel MOSFET manufactured by onsemi, designed for surface mount applications in the 8-SOIC package. This device features a 20V drain-to-source voltage rating with 6.7A continuous drain current capability and logic level gate operation. The FDS6812A is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across critical electrical parameters while accommodating the transition from obsolete to active product status.

Substiute Parts

FDS6812A

onsemiIn Stock: 30135FDS6812A Datasheet

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FDS9926A

onsemiIn Stock: 74335FDS9926A Datasheet

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DMN3033LSD-13

Diodes IncorporatedIn Stock: 26422DMN3033LSD-13 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDS6812A is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Drain to Source Voltage (Vdss) must be equal to or greater than 20V
• Continuous Drain Current (Id) must be equal to or greater than 6.7A at 25°C
• Configuration must be 2 N-Channel (Dual) with Logic Level Gate operation
• Operating temperature range must encompass -55°C to 150°C (TJ)

Mechanical Compatibility Requirements:

• Package must be 8-SOIC or equivalent 8-pin surface mount configuration
• Mounting type must be Surface Mount
• Moisture Sensitivity Level must be 1 (Unlimited) or equivalent

Regulatory and Compliance Requirements:

• REACH Status: REACH Unaffected
• ECCN: EAR99
• RoHS compliance status must be documented

The substitute parts identified below meet these criteria while accommodating variations in secondary parameters such as gate charge, input capacitance, and on-resistance that do not affect functional substitution within the specified electrical operating envelope.

Parameter Comparison

Engineering Selection Recommendations

FDS9926A (onsemi) - Primary Substitute

The FDS9926A is the recommended primary substitute for the FDS6812A. Both devices are manufactured by onsemi within the PowerTrench® series and share identical voltage and temperature specifications. The FDS9926A maintains the same 20V Vdss rating, equivalent continuous drain current (6.5A versus 6.7A), and identical logic level gate operation. The FDS9926A is classified as Active product status, ensuring long-term availability and supply chain continuity. RoHS3 compliance is documented for the FDS9926A, supporting modern regulatory requirements. The 8-SOIC package and surface mount configuration are identical, enabling direct PCB layout compatibility. Packaging is available in Cut Tape (CT) and Digi-Reel® formats, supporting both prototype and production volumes.

DMN3033LSD-13 (Diodes Incorporated) - Secondary Substitute

The DMN3033LSD-13 serves as a secondary substitute option, offering enhanced electrical performance characteristics. This device provides a higher 30V Vdss rating, delivering improved voltage margin over the original 20V specification. Continuous drain current is rated at 6.9A, exceeding the FDS6812A requirement of 6.7A. The DMN3033LSD-13 features superior on-resistance (20mOhm at 6.9A, 10V) and increased power dissipation capability (2W versus 900mW), providing thermal headroom for demanding applications. The device is Active product status with ROHS3 compliance. The 8-SOIC package maintains mechanical compatibility. Packaging is supplied in Tape & Reel (TR) format. The higher Vgs(th) threshold (2.1V versus 1.5V) and different gate charge measurement conditions (10V versus 4.5V) require circuit-level evaluation to confirm gate drive compatibility in existing designs.

Compliance and Regulatory Alignment

All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the FDS6812A. Both substitute parts are classified as Active product status, eliminating obsolescence risk. RoHS3 compliance is documented for both FDS9926A and DMN3033LSD-13, supporting environmental and regulatory requirements for new designs and production transitions.

Frequently Asked Questions (FAQ)

Q: Can the FDS9926A be used as a direct replacement for the FDS6812A without circuit modification?

A: The FDS9926A is electrically compatible with the FDS6812A across all critical parameters. Both devices share identical 20V Vdss rating, equivalent continuous drain current specifications, and identical logic level gate operation. The 8-SOIC package and surface mount configuration are identical, enabling direct PCB layout compatibility. No circuit modification is required for substitution.

Q: What are the key differences between the FDS9926A and DMN3033LSD-13?

A: The primary differences are voltage rating and power dissipation. The FDS9926A maintains the original 20V Vdss specification, while the DMN3033LSD-13 provides 30V Vdss, offering higher voltage margin. The DMN3033LSD-13 features 2W maximum power dissipation compared to 900mW for both the FDS6812A and FDS9926A. The DMN3033LSD-13 has a higher gate threshold voltage (2.1V versus 1.5V), which may affect gate drive circuit performance in existing designs.

Q: Is the DMN3033LSD-13 suitable for applications requiring the original 20V specification?

A: Yes. The DMN3033LSD-13 is rated for 30V Vdss, which exceeds the 20V requirement of the FDS6812A. This higher rating provides additional voltage margin and does not compromise functionality in 20V applications. However, the higher gate threshold voltage (2.1V) requires verification that existing gate drive circuits can reliably switch the device.

Q: Are both substitute parts available in the same packaging formats as the FDS6812A?

A: Both substitute parts are supplied in 8-SOIC surface mount packages with identical physical dimensions (0.154", 3.90mm width). Packaging format availability differs: FDS9926A is available in Cut Tape (CT) and Digi-Reel® formats, while DMN3033LSD-13 is supplied in Tape & Reel (TR) format. Both formats support production assembly processes.

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

A: Both FDS9926A and DMN3033LSD-13 are rated MSL 1 (Unlimited), matching the FDS6812A specification. This classification indicates unlimited shelf life under standard storage conditions without baking requirements.

Q: Do the substitute parts meet current RoHS and REACH requirements?

A: Yes. Both FDS9926A and DMN3033LSD-13 are ROHS3 compliant and maintain REACH Unaffected status, matching the regulatory profile of the FDS6812A. Both devices are classified EAR99 for export control purposes.

Q: Why is the FDS6812A classified as obsolete?

A: The FDS6812A is listed as obsolete product status. The FDS9926A and DMN3033LSD-13 are both classified as Active, ensuring continued availability and long-term supply chain support for new designs and production transitions.

Q: What is the significance of the gate charge and input capacitance differences between the parts?

A: Gate charge and input capacitance affect gate drive circuit performance and switching speed. The FDS9926A has lower gate charge (9nC versus 19nC) and lower input capacitance (650pF versus 1082pF), resulting in faster switching response and reduced gate drive power requirements. The DMN3033LSD-13 gate charge is measured at 10V versus 4.5V for the FDS6812A, requiring direct comparison at equivalent gate drive voltage levels for accurate circuit analysis.

Q: Can the substitute parts be used in high-frequency switching applications?

A: The lower gate charge and input capacitance of the FDS9926A support high-frequency switching with reduced switching losses compared to the FDS6812A. The DMN3033LSD-13 offers intermediate switching characteristics. Application-specific evaluation is required to confirm suitability for target frequency ranges and thermal constraints.