FDC637BNZ N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The FDC637BNZ is an N-Channel MOSFET manufactured by onsemi, rated for 20V drain-to-source voltage with 6.2A continuous drain current at 25°C. This device is housed in a SuperSOT™-6 package and is designed for surface mount applications requiring efficient switching performance in compact form factors. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be maintained across critical parameters including drain-to-source voltage rating, continuous drain current capability, on-resistance characteristics, and thermal performance specifications. Alternative devices may be required due to supply chain considerations, packaging preferences, or specific application constraints.

Substiute Parts

FDC637BNZ

onsemiIn Stock: 53229FDC637BNZ Datasheet

Current PartRFQ

NTGS3130NT1G

onsemiIn Stock: 17281NTGS3130NT1G Datasheet

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DMN2028UVT-7

Diodes IncorporatedIn Stock: 4441DMN2028UVT-7 Datasheet

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RUQ050N02TR

Rohm SemiconductorIn Stock: 16388RUQ050N02TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FDC637BNZ is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 20V
• Continuous Drain Current (Id): Must support 6.2A or greater at 25°C
• On-Resistance (Rds On): Must not exceed 24 mOhm at rated conditions
• Gate Threshold Voltage (Vgs(th)): Must remain within acceptable switching range
• Power Dissipation: Must support thermal requirements of 1.6W or greater
• Operating Temperature: Must span -55°C to 150°C minimum
• Package Compatibility: Surface mount configuration with SOT-23-6 footprint compatibility

Secondary Compatibility Factors:

• Gate Charge (Qg) characteristics for switching speed performance
• Input Capacitance (Ciss) for drive circuit requirements
• Maximum Gate Voltage (Vgs) rating for gate drive compatibility
• RoHS3 compliance and moisture sensitivity classification

The following parts meet substitution criteria based on these parameters:

Direct Electrical Equivalents (Full Parameter Match):

• DMN2028UVT-7 (Diodes Incorporated): Matches all primary electrical specifications with identical 6.2A rating and 24 mOhm on-resistance

Partial Electrical Equivalents (Reduced Current Rating):

• NTGS3130NT1G (onsemi): Reduced continuous drain current of 4.23A; suitable only for applications with lower current requirements
• RUQ050N02TR (Rohm Semiconductor): Reduced continuous drain current of 5A with slightly higher on-resistance of 30 mOhm; suitable for applications with lower current requirements

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: DMN2028UVT-7

The DMN2028UVT-7 manufactured by Diodes Incorporated provides complete electrical equivalence to the FDC637BNZ across all critical parameters. This device maintains identical 20V Vdss rating, 6.2A continuous drain current, and 24 mOhm on-resistance specification. The DMN2028UVT-7 is Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating. The TSOT-23-6 package footprint is compatible with SuperSOT™-6 applications. Gate charge is reduced to 8.3 nC, providing improved switching speed characteristics. This part is suitable for direct replacement in all applications where the FDC637BNZ is specified.

Secondary Substitute: RUQ050N02TR

The RUQ050N02TR manufactured by Rohm Semiconductor maintains the 20V Vdss rating and provides 5A continuous drain current with 30 mOhm on-resistance. This device is Active in product status with full RoHS3 compliance. The TSMT6 (SC-95) package provides SOT-23-6 footprint compatibility. This part is suitable for applications where continuous drain current requirements do not exceed 5A and where the slightly elevated on-resistance of 30 mOhm is acceptable for thermal and efficiency calculations.

Not Recommended: NTGS3130NT1G

The NTGS3130NT1G manufactured by onsemi carries Obsolete product status and is not recommended for new designs. Although this device maintains 20V Vdss rating and acceptable on-resistance characteristics, the reduced continuous drain current of 4.23A and significantly elevated gate charge of 20.3 nC limit its applicability. The 6-TSOP package differs from the SuperSOT™-6 footprint. Obsolete status indicates discontinued manufacturing and potential supply constraints.

Frequently Asked Questions (FAQ)

Q: Can the DMN2028UVT-7 be used as a direct replacement for the FDC637BNZ?

A: Yes. The DMN2028UVT-7 provides complete electrical equivalence across all critical parameters including 20V Vdss, 6.2A continuous drain current, and 24 mOhm on-resistance. The TSOT-23-6 package is footprint-compatible with SuperSOT™-6 applications. No circuit modifications are required.

Q: What is the primary difference between the FDC637BNZ and RUQ050N02TR?

A: The RUQ050N02TR provides reduced continuous drain current of 5A compared to 6.2A on the FDC637BNZ. Additionally, the on-resistance is specified at 30 mOhm versus 24 mOhm. These differences result in higher power dissipation per ampere and reduced current handling capability. The RUQ050N02TR is suitable only for applications with maximum current requirements of 5A or less.

Q: Why is the NTGS3130NT1G listed as a substitute if it has Obsolete status?

A: The NTGS3130NT1G is included in the comparison table for reference purposes only. Obsolete product status indicates that onsemi has discontinued manufacturing this device. New designs should not incorporate this part. Existing inventory may be available through secondary distributors, but supply is not guaranteed and future availability cannot be assured.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed—DMN2028UVT-7, NTGS3130NT1G, and RUQ050N02TR—maintain full RoHS3 compliance. All devices carry unlimited moisture sensitivity rating (MSL 1), indicating no special storage or handling requirements.

Q: How do package differences affect substitution?

A: The FDC637BNZ uses SuperSOT™-6 packaging, while substitutes use TSOT-23-6 or TSMT6 variants. All packages maintain SOT-23-6 footprint compatibility for printed circuit board layout purposes. Physical dimensions and pin configurations are equivalent, allowing direct PCB substitution without layout modifications.

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

A: Gate charge (Qg) affects switching speed and gate drive circuit requirements. The DMN2028UVT-7 has reduced gate charge of 8.3 nC compared to 12 nC on the FDC637BNZ, resulting in faster switching transitions. The NTGS3130NT1G has elevated gate charge of 20.3 nC, requiring higher gate drive current. These differences do not prevent substitution but may affect circuit performance in high-frequency switching applications.

Q: Can the FDC637BNZ be substituted in applications requiring 6.2A continuous current?

A: The DMN2028UVT-7 is the only substitute that maintains the full 6.2A continuous drain current rating. The RUQ050N02TR is limited to 5A, and the NTGS3130NT1G is limited to 4.23A. For applications requiring 6.2A operation, only the DMN2028UVT-7 provides equivalent current handling capability.

Q: What compliance certifications apply to all listed parts?

A: All parts maintain RoHS3 compliance, REACH Unaffected status, and EAR99 export classification. All devices carry unlimited moisture sensitivity rating (MSL 1). These certifications ensure regulatory compliance across industrial and commercial applications.