MPI4040R4-3R3-R Equivalent & Substitute Parts

Part Overview

The MPI4040R4-3R3-R is a 3.3 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This component is rated for 3.3 A continuous current with a DC resistance of 49 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.

Substiute Parts

MPI4040R4-3R3-R

Eaton - Electronics DivisionIn Stock: 701MPI4040R4-3R3-R Datasheet

Current PartRFQ

MPI4020V2-3R3-R

Eaton - Electronics DivisionIn Stock: 10886MPI4020V2-3R3-R Datasheet

DirectRFQ

SRP7028A-3R3M

Bourns Inc.In Stock: 9379SRP7028A-3R3M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPI4040R4-3R3-R are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Matching Parameters:

• Inductance value: 3.3 µH (exact match required)
• Inductance tolerance: ±20% (exact match required)
• Shielding: Shielded (required for EMI performance)
• Core type: Drum core wirewound (functional equivalence)
• Mounting type: Surface mount (required for PCB compatibility)
• Inductance test frequency: 100 kHz (measurement standard)
• Moisture sensitivity level: 1 (Unlimited) (handling and storage compatibility)

Allowable Parameter Variations:

• Current rating: Substitute parts may exceed the 3.3 A requirement
• DC resistance: Substitute parts may have lower DCR values
• Saturation current: Substitute parts may have higher Isat values
• Operating temperature range: Substitute parts may have extended ranges
• Package dimensions: Minor variations permitted if mounting compatibility is maintained
• Core material: Alternative materials acceptable if electrical performance is equivalent
• Product status: Active parts preferred over obsolete

Two substitute parts meet these criteria with varying degrees of parameter alignment.

Parameter Comparison

Engineering Selection Recommendations

MPI4020V2-3R3-R (Direct Substitute - Eaton)

This part is the primary substitute for the MPI4040R4-3R3-R. Both components are manufactured by Eaton - Electronics Division and share identical electrical specifications: 3.3 µH inductance, ±20% tolerance, 3.3 A current rating, and -55°C to 125°C operating temperature range. The MPI4020V2-3R3-R is currently in active production status with 10,814 pieces in stock, ensuring procurement continuity. The DC resistance is higher at 85 mOhm maximum compared to 49 mOhm, which represents a 73% increase in resistance. This part is ROHS3 compliant and available in Tape & Reel packaging. The saturation current is 4 A versus 4.5 A on the original part. Package dimensions are similar with minor variations (0.160" L x 0.171" W versus 0.175" L x 0.160" W).

SRP7028A-3R3M (Similar Substitute - Bourns)

This part provides an alternative from Bourns Inc. with superior electrical performance characteristics. The inductance value and tolerance remain identical at 3.3 µH ±20%. The current rating is elevated to 6 A with a saturation current of 12 A, providing greater headroom for transient conditions. The DC resistance is 30 mOhm maximum, representing a 39% reduction compared to the original part. The operating temperature range extends to -40°C to 150°C. This part is ROHS3 compliant, AEC-Q200 rated, and available in Tape & Reel packaging. The core material differs (Carbonyl Powder versus Metal Composite), and the package dimensions are larger (0.287" L x 0.260" W x 0.118" H). The self-resonant frequency is specified at 25 MHz with Q factor of 20 at 100 kHz.

Selection Criteria:

• For direct form-fit-function replacement with minimal design changes: Select MPI4020V2-3R3-R
• For applications requiring lower DC resistance and higher current margin: Select SRP7028A-3R3M
• For automotive or high-reliability applications: SRP7028A-3R3M (AEC-Q200 rated)
• For space-constrained designs: MPI4020V2-3R3-R (smaller package footprint)

Frequently Asked Questions (FAQ)

Q: Can MPI4020V2-3R3-R be used as a direct replacement for MPI4040R4-3R3-R?

A: Yes. Both parts share identical inductance (3.3 µH), tolerance (±20%), current rating (3.3 A), and operating temperature range (-55°C to 125°C). The MPI4020V2-3R3-R is manufactured by the same supplier (Eaton) and is currently in active production. The primary difference is increased DC resistance (85 mOhm versus 49 mOhm), which may affect thermal performance in high-current applications.

Q: What are the key differences between MPI4020V2-3R3-R and SRP7028A-3R3M?

A: Both parts maintain the 3.3 µH inductance specification. The SRP7028A-3R3M offers superior performance with 6 A current rating (versus 3.3 A), lower DC resistance (30 mOhm versus 85 mOhm), and higher saturation current (12 A versus 4 A). The SRP7028A-3R3M has a larger package footprint and is manufactured by Bourns Inc. rather than Eaton.

Q: Are there package compatibility concerns when substituting these parts?

A: The MPI4020V2-3R3-R has dimensions of 0.160" L x 0.171" W x 0.079" H, compared to the original 0.175" L x 0.160" W x 0.079" H. These dimensions are sufficiently similar for most PCB layouts. The SRP7028A-3R3M is significantly larger at 0.287" L x 0.260" W x 0.118" H and may require PCB layout modifications. Verify footprint compatibility before design implementation.

Q: Which substitute part is recommended for new designs?

A: For new designs, MPI4020V2-3R3-R is recommended as the primary choice due to form-fit-function compatibility with the obsolete MPI4040R4-3R3-R. For applications requiring enhanced performance margins, SRP7028A-3R3M is suitable if package size constraints permit. Both parts are in active production with adequate inventory.

Q: What is the impact of increased DC resistance in MPI4020V2-3R3-R?

A: The DC resistance increase from 49 mOhm to 85 mOhm results in proportionally higher resistive losses. At 3.3 A continuous current, power dissipation increases from 0.533 W to 0.924 W. This 73% increase in losses may require thermal management review in applications with tight thermal budgets.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MPI4020V2-3R3-R and SRP7028A-3R3M are ROHS3 compliant. The original MPI4040R4-3R3-R compliance status is not specified in available documentation.

Q: What is the significance of AEC-Q200 rating on SRP7028A-3R3M?

A: AEC-Q200 certification indicates the part meets automotive-grade reliability standards established by the Automotive Electronics Council. This rating is relevant for automotive, industrial, and high-reliability applications where component qualification to automotive standards is required.

Q: Can DC resistance differences affect circuit performance?

A: Yes. Higher DC resistance increases voltage drop across the inductor and reduces circuit efficiency. In filter applications, increased DCR may affect frequency response characteristics. In power supply designs, higher losses require thermal management consideration. Verify circuit performance with actual DCR values during design validation.