MPI4040R3-3R3-R Equivalent & Substitute Parts

Part Overview

The MPI4040R3-3R3-R is a 3.3 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3 A continuous current with a 60 mOhm DC resistance and operates across the temperature range of -55°C to 125°C. The part is classified as obsolete, necessitating identification of active equivalent components that maintain functional compatibility for new designs and ongoing production requirements.

Substiute Parts

MPI4040R3-3R3-R

Eaton - Electronics DivisionIn Stock: 10410MPI4040R3-3R3-R Datasheet

Current PartRFQ

MPI4020V2-3R3-R

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

SimilarRFQ

SRP7028A-3R3M

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MPI4040R3-3R3-R are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

• Inductance value: 3.3 µH (exact match required)
• Inductance tolerance: ±20% (identical specification)
• Core type: Drum core, wirewound, shielded construction
• Mounting type: Surface mount
• Inductance test frequency: 100 kHz

Allowable Variation Parameters:

• Current rating: Substitute parts must equal or exceed 3 A minimum
• DC resistance: Substitute parts may vary within acceptable circuit performance limits
• Operating temperature: Substitute parts must cover or exceed the -55°C to 125°C range
• Physical dimensions: Variation permitted within circuit board layout constraints
• Product status: Active parts are preferred for ongoing availability

The identified substitutes maintain the core electrical function while offering improvements in current handling capacity, reduced DC resistance, or enhanced temperature performance.

Parameter Comparison

Engineering Selection Recommendations

MPI4020V2-3R3-R (Eaton - Electronics Division)

This part is an active equivalent from the same manufacturer (Eaton - Electronics Division, MPI40-V2 series). It maintains identical inductance (3.3 µH), tolerance (±20%), and operating temperature range (-55°C to 125°C). The current rating increases from 3 A to 3.3 A, providing additional margin. DC resistance increases to 85 mOhm maximum, which represents a trade-off in power dissipation characteristics. This substitute is ROHS3 compliant and carries unlimited moisture sensitivity level (MSL 1). Selection of this part is appropriate for applications where manufacturer continuity and active product status are prioritized.

SRP7028A-3R3M (Bourns Inc.)

This part is an active component from Bourns Inc. (SRP7028A series) with identical inductance (3.3 µH) and tolerance (±20%). It provides significant improvements in current handling (6 A rating versus 3 A) and DC resistance (30 mOhm maximum versus 60 mOhm). The operating temperature range extends to 150°C maximum, exceeding the original specification. The part carries AEC-Q200 automotive qualification and is ROHS3 compliant. Physical dimensions are larger (0.287" L x 0.260" W versus 0.175" L x 0.160" W), requiring verification of circuit board layout compatibility. Selection of this part is appropriate for applications requiring enhanced current capacity, reduced power dissipation, or automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can MPI4020V2-3R3-R directly replace MPI4040R3-3R3-R in existing designs?

A: Yes, for applications where the 3 A current requirement is not exceeded. The MPI4020V2-3R3-R maintains identical inductance (3.3 µH), tolerance (±20%), and operating temperature range. The increased DC resistance (85 mOhm maximum versus 60 mOhm) results in higher power dissipation; thermal performance must be verified for high-current applications approaching the 3 A rating.

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

A: MPI4040R3-3R3-R measures 0.175" L x 0.160" W x 0.073" H (4.45mm x 4.06mm x 1.85mm). MPI4020V2-3R3-R measures 0.160" L x 0.171" W x 0.079" H (4.06mm x 4.35mm x 2.00mm). SRP7028A-3R3M measures 0.287" L x 0.260" W x 0.118" H (7.30mm x 6.60mm x 3.00mm). Circuit board layout must accommodate these dimensional variations.

Q: Is SRP7028A-3R3M suitable for applications requiring the original -55°C lower temperature limit?

A: SRP7028A-3R3M operates from -40°C to 150°C, which does not meet the -55°C lower limit of the original part. This substitute is not appropriate for applications requiring operation below -40°C.

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

A: AEC-Q200 is an automotive-grade reliability qualification. This certification indicates the part meets automotive industry standards for component reliability and is suitable for automotive applications. The original MPI4040R3-3R3-R does not carry this certification.

Q: How do the saturation current ratings compare?

A: MPI4040R3-3R3-R has saturation current (Isat) of 6.6 A. MPI4020V2-3R3-R has saturation current of 4 A. SRP7028A-3R3M has saturation current of 12 A. Saturation current defines the point at which inductance begins to degrade under high current conditions. Applications operating near maximum current ratings must consider these differences.

Q: Are all three parts RoHS compliant?

A: MPI4020V2-3R3-R and SRP7028A-3R3M are both ROHS3 compliant. RoHS compliance status is not specified for the original MPI4040R3-3R3-R. Both active substitutes meet current environmental compliance requirements.

Q: What packaging formats are available?

A: MPI4040R3-3R3-R packaging is listed as nonstandard. MPI4020V2-3R3-R is supplied in Tape & Reel (TR) format. SRP7028A-3R3M is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated assembly processes.