FDS6912 Equivalent & Substitute Parts

Part Overview

The FDS6912 is a dual N-channel MOSFET array manufactured by onsemi, designed for surface mount applications in the 8-SOIC package. This device features a 30V drain-to-source voltage rating with 6A continuous drain current capability and is part of the PowerTrench® series. The FDS6912 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Substitute components must maintain compatibility with the 8-SOIC package footprint and deliver equivalent or superior electrical performance within the specified parameter ranges.

Substiute Parts

FDS6912

onsemiIn Stock: 80219FDS6912 Datasheet

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FDS8984

onsemiIn Stock: 27879FDS8984 Datasheet

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CWDM305ND TR13 PBFREE

Central Semiconductor CorpIn Stock: 10845CWDM305ND TR13 PBFREE Datasheet

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STS8DNF3LL

STMicroelectronicsIn Stock: 15422STS8DNF3LL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDS6912 are selected based on strict electrical and mechanical compatibility criteria. All substitute components must meet the following requirements:

Mandatory Compatibility Parameters:

• Drain to Source Voltage (Vdss): 30V minimum
• Configuration: 2 N-Channel (Dual) MOSFET array
• Package: 8-SOIC (0.154", 3.90mm Width) surface mount
• Operating Temperature Range: -55°C to 150°C (TJ) minimum
• Technology: MOSFET (Metal Oxide)

Performance Parameters for Substitution:

• Continuous Drain Current (Id): Equal to or greater than 6A
• On-Resistance (Rds On): Equal to or lower than 28mOhm (at rated conditions)
• Gate Threshold Voltage (Vgs(th)): Within acceptable logic-level gate range
• Maximum Power Dissipation: Equal to or greater than 900mW

The three qualified substitute parts—FDS8984, CWDM305ND TR13 PBFREE, and STS8DNF3LL—satisfy all mandatory mechanical and electrical criteria while offering improved or equivalent performance characteristics compared to the obsolete FDS6912.

Parameter Comparison

Engineering Selection Recommendations

FDS8984 (onsemi)

The FDS8984 is the primary recommended substitute for the FDS6912. Both devices are manufactured by onsemi within the PowerTrench® series and share identical voltage and temperature specifications. The FDS8984 delivers superior performance with 7A continuous drain current (compared to 6A), lower on-resistance of 23mOhm, and increased power dissipation capability of 1.6W. The device maintains the same 8-SOIC package footprint and is classified as Active, ensuring long-term availability. RoHS3 compliance provides regulatory alignment for current manufacturing standards.

CWDM305ND TR13 PBFREE (Central Semiconductor Corp)

The CWDM305ND TR13 PBFREE provides an alternative from Central Semiconductor Corp with identical voltage and temperature ratings. This device offers the highest power dissipation at 2W and maintains the required 8-SOIC package. The continuous drain current of 5.8A is marginally below the FDS6912 specification but remains within acceptable substitution parameters. RoHS3 compliance and lead-free construction support modern manufacturing requirements. This option is suitable for applications where maximum thermal headroom is beneficial.

STS8DNF3LL (STMicroelectronics)

The STS8DNF3LL from STMicroelectronics represents an alternative within the STripFET™ II series. This device delivers the highest continuous drain current at 8A and the lowest on-resistance at 20mOhm, providing superior electrical performance. However, the product status is classified as Not For New Designs, limiting its suitability for new development projects. The operating temperature maximum specification of 150°C (without lower bound specification) differs from the FDS6912. This device is appropriate only for legacy system maintenance or where existing design validation has been completed.

Recommendation Priority:

1. FDS8984 for new designs and production applications requiring active product support
2. CWDM305ND TR13 PBFREE for applications requiring maximum thermal margin
3. STS8DNF3LL for legacy system support only, not recommended for new designs

Frequently Asked Questions (FAQ)

Q: Can the FDS8984 be used as a direct replacement for the FDS6912 in existing PCB layouts?

A: Yes. Both devices use the identical 8-SOIC (0.154", 3.90mm Width) package with the same pinout configuration for dual N-channel MOSFETs. The FDS8984 is a direct footprint and functional replacement. The improved electrical specifications (higher current rating, lower on-resistance) provide enhanced performance without design modification.

Q: What is the primary reason the FDS6912 requires substitution?

A: The FDS6912 is classified as obsolete, meaning onsemi has discontinued production and will not guarantee future availability. Substitute parts ensure design continuity and production supply chain reliability.

Q: Are all substitute parts RoHS3 compliant?

A: The FDS8984 and CWDM305ND TR13 PBFREE are explicitly RoHS3 compliant. The STS8DNF3LL is also RoHS3 compliant. RoHS3 compliance ensures compatibility with current environmental and regulatory requirements for electronic component manufacturing.

Q: Why is the STS8DNF3LL marked as "Not For New Designs"?

A: This product status indicates that STMicroelectronics has limited the device to legacy applications and does not recommend its use in new development projects. While the device remains available and functional, the manufacturer does not guarantee long-term support or future production. New designs should prioritize FDS8984 or CWDM305ND TR13 PBFREE.

Q: How do the on-resistance specifications differ between substitute parts?

A: On-resistance varies based on measurement conditions. FDS8984 specifies 23mOhm @ 7A, 10V; CWDM305ND TR13 PBFREE specifies 30mOhm @ 2.9A, 10V; STS8DNF3LL specifies 20mOhm @ 4A, 10V. Lower on-resistance reduces power dissipation and heat generation. The FDS8984 and STS8DNF3LL offer improved efficiency compared to the original FDS6912 specification of 28mOhm @ 6A, 10V.

Q: What is the significance of the Moisture Sensitivity Level (MSL) rating?

A: All parts, including the FDS6912 and its substitutes, carry MSL 1 (Unlimited) rating. This indicates the components have unlimited shelf life and require no special moisture control during storage or handling, simplifying inventory management and reducing component degradation risk.

Q: Can gate charge differences affect circuit performance?

A: Gate charge affects switching speed and driver circuit requirements. The FDS6912 specifies 10nC @ 5V, while substitutes range from 6.3nC to 17nC. Lower gate charge enables faster switching and reduces driver power consumption. Existing driver circuits designed for the FDS6912 will function with substitute parts, though switching characteristics will differ slightly.

Q: Are there any temperature range limitations with substitute parts?

A: The FDS8984 and CWDM305ND TR13 PBFREE maintain the full -55°C to 150°C operating range. The STS8DNF3LL specifies only 150°C maximum without explicit lower temperature specification, which may present limitations in extreme cold environments. For applications requiring the full temperature range, FDS8984 or CWDM305ND TR13 PBFREE are preferred.