FDD3690 Equivalent & Substitute Parts

Part Overview

The FDD3690 is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 22A continuous drain current at 25°C. This device operates in the PowerTrench® series and is housed in a Surface Mount TO-252AA (DPAK) package. The FDD3690 maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance parameters align within the specified operating ranges, allowing direct functional replacement in circuit applications while maintaining the same package footprint and thermal characteristics.

Substiute Parts

FDD3690

onsemiIn Stock: 15425FDD3690 Datasheet

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STD15NF10T4

STMicroelectronicsIn Stock: 15410STD15NF10T4 Datasheet

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STD20NF10T4

STMicroelectronicsIn Stock: 10159STD20NF10T4 Datasheet

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STD25NF10LT4

STMicroelectronicsIn Stock: 688245STD25NF10LT4 Datasheet

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STD25NF10T4

STMicroelectronicsIn Stock: 1000201STD25NF10T4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FDD3690 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum Drain-to-Source Voltage (Vdss) of 100V to ensure equivalent voltage withstand capability.

Current Rating: Substitute parts must support a continuous drain current (Id) at 25°C equal to or greater than 22A (Tc) to handle equivalent load conditions.

Package Compatibility: All substitutes must use the TO-252-3 DPAK (2 Leads + Tab) surface mount package to ensure mechanical and thermal interface compatibility.

Thermal Performance: Power dissipation capability at case temperature (Tc) must be sufficient for the application thermal environment.

Compliance & Status: All substitute parts must maintain Active product status and RoHS3 compliance to meet regulatory and supply chain requirements.

The following parts meet these substitution criteria: STD15NF10T4, STD20NF10T4, STD25NF10LT4, and STD25NF10T4 (all STMicroelectronics STripFET™ II series devices).

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and full RoHS3 compliance, meeting regulatory requirements equivalent to the FDD3690. The STMicroelectronics STripFET™ II series devices (STD15NF10T4, STD20NF10T4, STD25NF10LT4, STD25NF10T4) provide electrical performance within the specified parameter ranges for direct substitution.

STD25NF10T4 offers the closest electrical match with 25A continuous drain current, 38mOhm on-resistance at 10V, and 100W power dissipation capability, providing performance parity with the FDD3690 across all critical operating parameters.

STD25NF10LT4 provides enhanced performance with lower on-resistance (35mOhm) and lower gate threshold voltage (2.5V), suitable for applications requiring improved efficiency or lower drive voltage requirements.

STD20NF10T4 and STD15NF10T4 support the FDD3690 current rating with slightly higher on-resistance values and reduced power dissipation ratings, appropriate for applications with lower thermal budgets or reduced current demands.

All substitute parts share identical package geometry (TO-252-3 DPAK), operating temperature range (-55°C to 175°C), and moisture sensitivity classification (MSL 1), ensuring mechanical and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can STD25NF10T4 directly replace FDD3690 in existing circuit boards?

A: Yes. Both devices use identical TO-252-3 DPAK surface mount packages with matching pin configurations and thermal interface characteristics. No PCB layout modifications are required.

Q: What is the primary difference between STD25NF10LT4 and STD25NF10T4?

A: STD25NF10LT4 features lower on-resistance (35mOhm vs. 38mOhm) and lower gate threshold voltage (2.5V vs. 4V), resulting in improved switching efficiency and reduced drive voltage requirements. Both support 25A continuous current and 100V voltage rating.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (STD15NF10T4, STD20NF10T4, STD25NF10LT4, STD25NF10T4) maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the FDD3690 regulatory status.

Q: Which substitute part provides the best thermal performance?

A: STD25NF10LT4 and STD25NF10T4 both support 100W power dissipation at case temperature, exceeding the FDD3690 specification of 60W. These parts accommodate higher thermal loads in equivalent package footprints.

Q: Can lower-current rated parts (STD15NF10T4, STD20NF10T4) substitute for FDD3690 in high-current applications?

A: STD15NF10T4 (23A) and STD20NF10T4 (25A) both meet or exceed the FDD3690 22A continuous current rating. Selection depends on application current requirements and thermal management capabilities. STD20NF10T4 and higher-rated parts provide design margin for 22A operation.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across -55°C to 175°C junction temperature range, matching the FDD3690 specification and supporting equivalent thermal environments.

Q: Are gate charge characteristics similar across all substitute parts?

A: Gate charge values range from 39nC (FDD3690) to 55nC (STD20NF10T4, STD25NF10T4), with STD25NF10LT4 at 52nC. Higher gate charge may require increased driver current capability but remains within acceptable switching performance parameters for standard gate driver circuits.