MPI4040R4-6R8-R Equivalent & Substitute Parts

Part Overview

The MPI4040R4-6R8-R is a 6.8 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 2.4 A continuous current with a DC resistance of 91 mOhm and operates across the temperature range of -55°C to 125°C. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain the specified inductance value, current rating, shielding characteristics, and operating temperature range to ensure functional compatibility in existing applications.

Substiute Parts

MPI4040R4-6R8-R

Eaton - Electronics DivisionIn Stock: 773MPI4040R4-6R8-R Datasheet

Current PartRFQ

MPI4020V2-6R8-R

Eaton - Electronics DivisionIn Stock: 10657MPI4020V2-6R8-R Datasheet

DirectRFQ

SRP7028A-6R8M

Bourns Inc.In Stock: 18466SRP7028A-6R8M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPI4040R4-6R8-R are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 6.8 µH (±20% tolerance)
• Inductance tolerance: ±20%
• Current rating: minimum 2.4 A
• Shielding: Shielded configuration required
• Core type: Drum core wirewound construction
• Mounting type: Surface mount
• Operating temperature range: minimum -55°C to 125°C coverage

Secondary Compatibility Factors:

• DC resistance within acceptable limits for the application
• Saturation current rating above minimum operating current
• Package footprint compatibility with PCB layout constraints

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status considerations.

Parameter Comparison

Engineering Selection Recommendations

MPI4020V2-6R8-R (Direct Substitute - Recommended for Primary Selection)

The MPI4020V2-6R8-R is the direct equivalent from Eaton - Electronics Division. This part maintains identical inductance (6.8 µH), tolerance (±20%), current rating (2.4 A), and operating temperature range (-55°C to 125°C) as the obsolete MPI4040R4-6R8-R. The part is currently in active production status with substantial inventory availability (10588 Pcs). RoHS compliance certification is provided. The primary design consideration is the increased DC resistance (175 mOhm Max versus 91 mOhm), which will result in higher power dissipation in the inductor. The saturation current rating of 2.5 A is marginally lower than the original part's 3.2 A specification. Package dimensions differ slightly (0.160" L x 0.171" W versus 0.175" L x 0.160" W), requiring PCB layout verification for footprint compatibility.

SRP7028A-6R8M (Alternative Substitute - For Higher Current Applications)

The SRP7028A-6R8M from Bourns Inc. provides enhanced electrical performance characteristics with higher current rating (4.5 A), lower DC resistance (60 mOhm Max), and higher saturation current (8 A). This part is suitable for applications requiring improved thermal performance or higher current headroom. The part is active in production with extensive inventory (18400 Pcs) and carries ROHS3 compliance and AEC-Q200 automotive qualification. Operating temperature range extends to 150°C maximum. Significant design trade-offs include larger package dimensions (0.287" L x 0.260" W x 0.118" H versus 0.175" L x 0.160" W x 0.079" H), which may require PCB redesign. Core material differs (Carbonyl Powder versus Metal Composite), affecting frequency response characteristics. Lower operating temperature minimum (-40°C versus -55°C) may be limiting for extreme cold environment applications.

Frequently Asked Questions (FAQ)

Q: Can MPI4020V2-6R8-R be used as a direct drop-in replacement for MPI4040R4-6R8-R?

A: The MPI4020V2-6R8-R matches all critical electrical parameters (inductance, tolerance, current rating, operating temperature). However, the increased DC resistance (175 mOhm versus 91 mOhm) will increase power dissipation. Verify that thermal design margins accommodate this change. Package dimensions differ slightly; confirm PCB footprint compatibility before implementation.

Q: What is the impact of higher DC resistance in the MPI4020V2-6R8-R?

A: Higher DC resistance increases I²R losses in the inductor. At 2.4 A continuous current, the MPI4020V2-6R8-R dissipates approximately 1.01 W compared to 0.52 W for the original part. Thermal management and circuit efficiency calculations must be updated accordingly.

Q: When should SRP7028A-6R8M be selected over MPI4020V2-6R8-R?

A: Select SRP7028A-6R8M when the application requires lower DC resistance (60 mOhm), higher current capacity (4.5 A), or extended temperature operation to 150°C. The larger package footprint must be accommodated in the PCB layout. This part is suitable for automotive applications requiring AEC-Q200 qualification.

Q: Are there package compatibility issues between these substitute parts?

A: Yes. The MPI4040R4-6R8-R uses 1816 (4540 Metric) package. The MPI4020V2-6R8-R uses a nonstandard 2-lead package with similar but not identical dimensions. The SRP7028A-6R8M uses a larger nonstandard package (0.287" x 0.260" x 0.118"). PCB layout verification is required for each substitution.

Q: What is the minimum saturation current requirement for safe operation?

A: Saturation current must exceed the maximum operating current in the circuit. The MPI4040R4-6R8-R has Isat of 3.2 A. The MPI4020V2-6R8-R has Isat of 2.5 A, which is lower. Verify that peak transient currents do not exceed 2.5 A to prevent inductor saturation and performance degradation.

Q: Are there compliance or certification differences between these parts?

A: The MPI4020V2-6R8-R carries RoHS compliance certification. The SRP7028A-6R8M carries ROHS3 compliance and AEC-Q200 automotive qualification. Select based on regulatory requirements for the end application.

Q: What is the operating temperature consideration for SRP7028A-6R8M?

A: The SRP7028A-6R8M operates from -40°C to 150°C, which does not cover the full -55°C lower limit of the original part. If the application requires operation below -40°C, the MPI4020V2-6R8-R is the appropriate selection.