FDD6632 Equivalent & Substitute Parts

Part Overview

The FDD6632 is an N-Channel MOSFET manufactured by onsemi, rated for 30V drain-to-source voltage with 9A continuous drain current at 25°C. The device is housed in a TO-252-3 DPAK package and is designed for surface mount applications. The FDD6632 is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while accommodating the same or compatible package footprint.

Substiute Parts

FDD6632

onsemiIn Stock: 20102FDD6632 Datasheet

Current PartRFQ

STD17NF03LT4

STMicroelectronicsIn Stock: 8802STD17NF03LT4 Datasheet

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STD18NF03L

STMicroelectronicsIn Stock: 2947STD18NF03L Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FDD6632 are qualified based on the following electrical and mechanical parameters:

Voltage Rating Compatibility: All substitute parts must maintain a Vdss rating of 30V or greater to ensure safe operation within the original design envelope.

Current Capacity: Substitute parts must support continuous drain current equal to or exceeding 9A at 25°C. Parts with higher current ratings provide design margin and thermal headroom.

On-State Resistance: Rds On characteristics must be compatible with the original circuit requirements. Lower Rds On values reduce power dissipation and heat generation.

Gate Threshold Voltage: Vgs(th) must fall within acceptable ranges to ensure proper gate drive compatibility with existing control circuitry.

Package Compatibility: All substitute parts utilize the TO-252-3 DPAK package, ensuring mechanical and thermal interface compatibility with existing PCB layouts.

Operating Temperature Range: All parts support the -55°C to 175°C junction temperature range, maintaining thermal performance across the full operating spectrum.

Product Status: Active substitute parts ensure long-term availability and supply chain continuity compared to the obsolete FDD6632.

Parameter Comparison

Engineering Selection Recommendations

STD17NF03LT4 and STD18NF03L Selection Basis:

Both STMicroelectronics substitute parts meet or exceed all critical electrical parameters of the FDD6632. The 30V Vdss rating matches the original specification, while the 17A continuous drain current provides 89% additional current capacity beyond the 9A requirement. Both parts are rated for identical operating temperature ranges (-55°C to 175°C), ensuring thermal compatibility.

The substitute parts feature lower gate threshold voltage (2.2V versus 3V), which may require gate drive circuit evaluation to confirm compatibility with existing control logic. The lower Rds On value (50 mOhm versus 70 mOhm) reduces conduction losses and improves thermal performance.

Both substitute parts are classified as Active products, ensuring long-term availability and supply chain stability. Both are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The TO-252-3 DPAK package is identical across all three parts, eliminating PCB layout modifications.

STD17NF03LT4 is supplied in Cut Tape and Digi-Reel packaging formats, with 8,694 units in stock.

STD18NF03L is supplied in Cut Tape and Digi-Reel packaging formats, with 2,876 units in stock.

Both parts are electrically equivalent for the FDD6632 application and are interchangeable based on the provided electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can STD17NF03LT4 or STD18NF03L directly replace FDD6632 in existing designs?

A: Both STMicroelectronics parts are electrically compatible with the FDD6632 across all critical parameters: 30V Vdss rating, continuous drain current exceeding 9A requirement, and identical operating temperature range. The TO-252-3 DPAK package is mechanically identical, requiring no PCB modifications. Gate drive circuits should be evaluated to confirm compatibility with the lower gate threshold voltage (2.2V versus 3V).

Q: What are the key differences between FDD6632 and the substitute parts?

A: The substitute parts provide higher continuous drain current (17A versus 9A), lower on-state resistance (50 mOhm versus 70 mOhm), and higher power dissipation capability (30W versus 15W). These improvements reduce thermal stress and improve circuit efficiency. The substitute parts feature lower gate threshold voltage and slightly higher input capacitance. Both substitute parts are Active products with current RoHS3 compliance, compared to the Obsolete status of the FDD6632.

Q: Are there any gate drive compatibility concerns with the substitute parts?

A: The substitute parts feature a gate threshold voltage of 2.2V compared to the FDD6632 specification of 3V. Gate drive circuits designed for the original part should be evaluated to confirm adequate drive voltage margin. The maximum gate voltage rating is ±16V for the substitute parts versus ±20V for the FDD6632. Existing gate drive circuits operating within ±16V are fully compatible.

Q: Do the substitute parts require different PCB layout considerations?

A: No. Both STD17NF03LT4 and STD18NF03L utilize the identical TO-252-3 DPAK package as the FDD6632. PCB footprints, thermal vias, and mounting requirements remain unchanged. Thermal performance is improved due to lower on-state resistance and higher power dissipation capability.

Q: What is the availability status of the substitute parts?

A: Both substitute parts are classified as Active products with current inventory: STD17NF03LT4 has 8,694 units in stock, and STD18NF03L has 2,876 units in stock. Both are supplied in Cut Tape and Digi-Reel packaging formats suitable for automated assembly processes.

Q: Are the substitute parts compliant with current environmental regulations?

A: Yes. Both STD17NF03LT4 and STD18NF03L are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components. The FDD6632 REACH status is unaffected but RoHS compliance is not specified.