MPI4040R3-100-R Equivalent & Substitute Parts

Part Overview

The MPI4040R3-100-R is a 10 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.5 A continuous current with a DC resistance of 213 mOhm and operates across the temperature range of -55°C to 125°C. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

MPI4040R3-100-R

Eaton - Electronics DivisionIn Stock: 849MPI4040R3-100-R Datasheet

Current PartRFQ

MPI4020V2-100-R

Eaton - Electronics DivisionIn Stock: 4632MPI4020V2-100-R Datasheet

SimilarRFQ

SRP7028A-100M

Bourns Inc.In Stock: 21063SRP7028A-100M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the MPI4040R3-100-R must satisfy the following core electrical and mechanical criteria:

Primary Matching Criteria:

• Inductance value: 10 µH (±20% tolerance)
• Inductance tolerance: ±20%
• Shielding: Shielded configuration
• Core type: Drum core, wirewound construction
• Mounting: Surface mount
• Inductance test frequency: 100 kHz

Secondary Compatibility Criteria:

• Current rating: Equal to or greater than 1.5 A
• DC resistance: Lower or equivalent to 213 mOhm (lower DCR preferred for reduced losses)
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Saturation current: Equal to or greater than 3.8 A

The two identified substitute parts meet these criteria while offering improved availability and active product status.

Parameter Comparison

Engineering Selection Recommendations

MPI4020V2-100-R (Eaton - Electronics Division):

This substitute maintains identical inductance, tolerance, and operating temperature range specifications. The current rating increases from 1.5 A to 1.7 A, providing marginal headroom. DC resistance increases to 281 mOhm maximum, representing a 32% increase in losses compared to the main part. Saturation current decreases to 2.2 A, which is below the main part's 3.8 A specification. This part is active and RoHS compliant, with standard tape and reel packaging available. Selection of this substitute is appropriate for applications where the 1.7 A current rating is sufficient and the reduced saturation margin is acceptable.

SRP7028A-100M (Bourns Inc.):

This substitute provides the same 10 µH inductance with ±20% tolerance and extends the operating temperature range to -40°C to 150°C. The current rating of 3.5 A significantly exceeds the main part requirement, and DC resistance of 85 mOhm maximum is substantially lower, reducing power dissipation by 60%. Saturation current of 6 A provides substantial margin above the main part's 3.8 A. The core material differs (carbonyl powder versus metal composite), and physical dimensions are larger (7.30mm x 6.60mm versus 4.45mm x 4.06mm). This part is active, ROHS3 compliant, and REACH unaffected. Selection of this substitute is appropriate for applications requiring improved thermal performance, lower losses, and higher current capacity, provided board space accommodates the larger package.

Frequently Asked Questions (FAQ)

Q: Can MPI4020V2-100-R be used as a direct replacement for MPI4040R3-100-R?

A: MPI4020V2-100-R meets the core electrical specifications (10 µH inductance, ±20% tolerance, shielded drum core, surface mount). However, the saturation current decreases from 3.8 A to 2.2 A, and DC resistance increases from 213 mOhm to 281 mOhm maximum. Direct substitution is valid only if the application does not require the original saturation margin and can tolerate increased losses.

Q: What are the physical dimension differences between these parts?

A: MPI4040R3-100-R measures 4.45mm L x 4.06mm W x 1.85mm H. MPI4020V2-100-R measures 4.06mm L x 4.35mm W x 2.00mm H. SRP7028A-100M measures 7.30mm L x 6.60mm W x 3.00mm H. Board layout must accommodate these variations.

Q: Why does SRP7028A-100M have lower DC resistance?

A: SRP7028A-100M uses carbonyl powder core material versus the metal composite core in the main part. This material difference, combined with the larger physical size, enables lower resistance winding design while maintaining the same inductance value.

Q: Are there compliance or certification differences?

A: MPI4020V2-100-R is RoHS compliant. SRP7028A-100M is ROHS3 compliant and REACH unaffected. The main part's compliance status is not specified. Applications requiring specific regulatory compliance should verify against design requirements.

Q: What is the impact of the different saturation current ratings?

A: Saturation current defines the maximum current before inductance degrades significantly. MPI4040R3-100-R saturates at 3.8 A, MPI4020V2-100-R at 2.2 A, and SRP7028A-100M at 6 A. Applications operating near or above 2.2 A should not use MPI4020V2-100-R. Applications requiring margin above 3.8 A should use SRP7028A-100M.

Q: How do packaging formats affect procurement?

A: MPI4020V2-100-R is supplied in tape and reel format. SRP7028A-100M is supplied in cut tape and Digi-Reel format. Procurement and assembly processes must accommodate these packaging differences.