RFP40N10 Equivalent & Substitute Parts

Part Overview

The RFP40N10 is an N-Channel MOSFET manufactured by onsemi, rated for 100V drain-to-source voltage with 40A continuous drain current at 25°C. This device is packaged in TO-220-3 through-hole configuration and is designed for general-purpose switching applications requiring moderate to high current handling at 100V operation levels. The RFP40N10 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute devices must maintain electrical compatibility across voltage ratings, current capacity, and thermal characteristics while accommodating available packaging and product status options.

Substiute Parts

RFP40N10

onsemiIn Stock: 15518RFP40N10 Datasheet

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IRF540PBF

Vishay SiliconixIn Stock: 19806IRF540PBF Datasheet

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PSMN027-100PS,127

Nexperia USA Inc.In Stock: 23088PSMN027-100PS,127 Datasheet

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STP30NF10

STMicroelectronicsIn Stock: 70978STP30NF10 Datasheet

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STP40NF10L

STMicroelectronicsIn Stock: 15535STP40NF10L Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RFP40N10 are selected based on the following critical parameters that determine functional equivalence:

Primary Selection Criteria:

• Drain to Source Voltage (Vdss): Must equal 100V
• FET Type: Must be N-Channel
• Technology: Must be MOSFET (Metal Oxide)
• Mounting Type: Must be Through Hole
• Package Category: Must be TO-220 variant (TO-220-3, TO-220AB, TO-220)

Secondary Compatibility Parameters:

• Continuous Drain Current (Id): Substitute must support minimum 40A or provide acceptable current rating for the application
• Rds On (Max): Lower or equal values indicate improved performance
• Gate Threshold Voltage (Vgs(th)): Must be compatible with 4V specification
• Power Dissipation: Must support thermal requirements
• Operating Temperature Range: Must encompass -55°C to 175°C or equivalent

All substitute parts listed maintain 100V Vdss rating, N-Channel configuration, and through-hole TO-220 packaging, ensuring mechanical and electrical compatibility with the RFP40N10 footprint and circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: STP40NF10L

The STP40NF10L from STMicroelectronics is the closest functional equivalent to the RFP40N10. This device matches the 40A continuous drain current specification and maintains 100V Vdss rating. The STP40NF10L is classified as Active product status, ensuring long-term availability and supply chain stability. The device is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The lower Rds On value of 33 mOhm at 20A, 10V compared to the RFP40N10's 40 mOhm indicates improved efficiency characteristics. TO-220 packaging provides direct mechanical compatibility with the original RFP40N10 footprint.

Secondary Recommendation: STP30NF10

The STP30NF10 from STMicroelectronics provides a suitable alternative for applications where 35A continuous drain current is acceptable. This device maintains 100V Vdss and is classified as Active product status with ROHS3 compliance. The STP30NF10 features a 45 mOhm Rds On specification, which is comparable to the RFP40N10. This option is appropriate for designs with current requirements below 40A or where thermal management allows for the 115W power dissipation rating.

Tertiary Recommendation: PSMN027-100PS,127

The PSMN027-100PS,127 from Nexperia USA Inc. offers 37A continuous drain current with superior Rds On performance of 26.8 mOhm at 15A, 10V. This device is ROHS3 compliant and REACH unaffected. Although classified as Obsolete, this part provides excellent electrical characteristics for applications requiring lower on-resistance. The 103W power dissipation rating requires thermal design consideration compared to the RFP40N10's 160W rating.

Alternative Option: IRF540PBF

The IRF540PBF from Vishay Siliconix maintains 100V Vdss and is classified as Active product status with ROHS3 compliance. This device is rated for 28A continuous drain current, which is lower than the RFP40N10's 40A specification. The IRF540PBF is suitable for applications where current requirements do not exceed 28A. The higher Rds On value of 77 mOhm at 17A, 10V indicates higher conduction losses compared to the RFP40N10.

Frequently Asked Questions (FAQ)

Q: Can the STP40NF10L directly replace the RFP40N10 in existing designs?

A: The STP40NF10L is mechanically and electrically compatible with the RFP40N10. Both devices feature 100V Vdss, 40A continuous drain current, and TO-220 through-hole packaging. The STP40NF10L's lower Rds On value of 33 mOhm provides improved efficiency. No circuit modifications are required for direct substitution.

Q: What is the difference between TO-220-3 and TO-220AB packaging?

A: TO-220-3 and TO-220AB are functionally equivalent through-hole packages with identical pin configurations and mechanical footprints. Both accommodate the same PCB layout and heatsink mounting arrangements. The designations reflect different manufacturer naming conventions for the same physical package.

Q: Why is the RFP40N10 listed as obsolete?

A: The RFP40N10 is classified as obsolete by onsemi, indicating that the manufacturer has discontinued active production and support. Substitute parts ensure continued availability for new designs and production requirements. Active-status alternatives such as the STP40NF10L provide equivalent functionality with ongoing manufacturer support.

Q: How do I select between the STP40NF10L and STP30NF10?

A: Selection depends on application current requirements. The STP40NF10L is rated for 40A continuous drain current and matches the RFP40N10 specification exactly. The STP30NF10 is rated for 35A and is suitable for applications with lower current demands. Both devices maintain 100V Vdss and are Active-status products.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates that the device meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials including lead, mercury, and cadmium. ROHS3-compliant devices are required for applications subject to European Union regulations and are increasingly standard across global supply chains.

Q: Is the IRF540PBF suitable as a substitute if my application requires 40A?

A: The IRF540PBF is rated for 28A continuous drain current, which is below the RFP40N10's 40A specification. This device is not suitable for applications requiring the full 40A current capacity. The IRF540PBF is appropriate only for designs with maximum current requirements of 28A or lower.

Q: What thermal considerations apply when substituting the RFP40N10?

A: The RFP40N10 is rated for 160W maximum power dissipation. Substitute devices have varying power dissipation ratings: STP40NF10L (150W), STP30NF10 (115W), PSMN027-100PS,127 (103W), and IRF540PBF (150W). Thermal design must accommodate the selected substitute's power dissipation rating. Lower Rds On values reduce conduction losses and heat generation.

Q: Are all substitute parts REACH compliant?

A: REACH compliance status varies among substitutes. The STP40NF10L, STP30NF10, and PSMN027-100PS,127 are REACH unaffected. The IRF540PBF is REACH affected. Applications subject to REACH regulations should prioritize REACH-unaffected alternatives.

Q: Can I use the PSMN027-100PS,127 despite its obsolete status?

A: The PSMN027-100PS,127 is classified as obsolete but offers superior Rds On performance of 26.8 mOhm. Current inventory availability is 23,005 pieces. This device is suitable for applications where electrical performance justifies the obsolete status, provided supply chain continuity is confirmed with the distributor.