MPI5451R3-4R7-R Equivalent & Substitute Parts

Part Overview

The MPI5451R3-4R7-R is a 4.7 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3 A continuous current with a 50 mOhm DC resistance and operates across the temperature range of -40°C to 125°C. The part carries an obsolete product status, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

MPI5451R3-4R7-R

Eaton - Electronics DivisionIn Stock: 815MPI5451R3-4R7-R Datasheet

Current PartRFQ

DR73-4R7-R

Eaton - Electronics DivisionIn Stock: 2130DR73-4R7-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MPI5451R3-4R7-R is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 4.7 µH at 100 kHz test frequency
• Inductance tolerance: ±20%
• Shielding configuration: Shielded
• Core construction: Drum core wirewound
• Mounting technology: Surface mount
• Operating temperature range: -40°C to 125°C minimum

Secondary Compatibility Parameters:

• Current rating: minimum 3 A continuous
• Saturation current: minimum 3.8 A
• DC resistance: acceptable range based on circuit thermal and efficiency requirements
• Moisture sensitivity: MSL 1 or better

The DR73-4R7-R meets all primary matching criteria and demonstrates superior electrical performance in current handling and DC resistance characteristics, qualifying it as a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: DR73-4R7-R

The DR73-4R7-R from Eaton - Electronics Division is the qualified substitute for the obsolete MPI5451R3-4R7-R. Selection rationale is based on the following engineering factors:

Product Status Alignment: The DR73-4R7-R maintains active product status with confirmed inventory availability (2022 pcs), ensuring long-term procurement viability compared to the obsolete MPI5451R3-4R7-R.

Electrical Performance: The substitute demonstrates equivalent or superior electrical characteristics across all critical parameters. The 3.09 A current rating exceeds the original 3 A specification, and the saturation current of 3.78 A remains within acceptable tolerance of the original 3.8 A. The reduced DC resistance of 29.7 mOhm compared to 50 mOhm provides improved thermal efficiency in power conversion applications.

Compliance and Certifications: The DR73-4R7-R carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The original part carries no specified compliance documentation.

Physical and Functional Compatibility: Both components share identical inductance values, tolerance specifications, shielding configuration, operating temperature range, and mounting technology. The nonstandard package classification applies to both parts, indicating equivalent form factor considerations for PCB layout and thermal management.

Core Material Difference: The substitute utilizes ferrite core material compared to the original metal composite core. Both configurations achieve the specified inductance and current ratings within the defined tolerance band at the 100 kHz test frequency.

Frequently Asked Questions (FAQ)

Q: Can the DR73-4R7-R be used as a direct replacement for MPI5451R3-4R7-R in existing designs?

A: Yes. Both components share identical inductance values (4.7 µH ±20%), operating temperature range (-40°C to 125°C), shielding configuration, and mounting technology. The DR73-4R7-R meets or exceeds all electrical performance requirements of the original part.

Q: What is the significance of the lower DC resistance in the DR73-4R7-R?

A: The DR73-4R7-R exhibits 29.7 mOhm DC resistance compared to 50 mOhm in the original part. This 40.6% reduction in resistance results in lower power dissipation and improved thermal performance in applications where the inductor carries continuous or high-duty-cycle current. Circuit thermal analysis should confirm this improvement is compatible with PCB thermal design.

Q: Are there physical size differences between these components?

A: Yes. The MPI5451R3-4R7-R measures 0.216" L × 0.204" W × 0.079" H (5.49mm × 5.18mm × 2.00mm), while the DR73-4R7-R measures 0.299" L × 0.299" W × 0.140" H (7.60mm × 7.60mm × 3.55mm). PCB layout and thermal clearance must be verified for the larger substitute component.

Q: What is the difference between metal composite and ferrite core materials?

A: Both core materials achieve the specified inductance and current ratings within the defined tolerance band. Metal composite cores typically offer lower core loss at higher frequencies, while ferrite cores provide good shielding characteristics. Both configurations are shielded and suitable for the 100 kHz test frequency specification.

Q: Why is the original MPI5451R3-4R7-R marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The DR73-4R7-R represents the active equivalent from the same manufacturer, ensuring design continuity and procurement support for new and legacy applications.

Q: Are there compliance or certification differences?

A: The DR73-4R7-R carries ROHS3 compliance and REACH unaffected status. The original part carries no specified compliance documentation. Modern procurement and regulatory requirements favor the DR73-4R7-R for new designs and long-term supply chain management.

Q: What packaging format is used for the DR73-4R7-R?

A: The DR73-4R7-R is supplied in Tape & Reel (TR) format, suitable for automated assembly processes. Confirm packaging compatibility with your manufacturing equipment and procurement requirements.

Q: Is the saturation current specification critical for substitution?

A: Yes. The saturation current defines the maximum current before the inductor enters nonlinear operation and inductance begins to degrade. The DR73-4R7-R saturation current of 3.78 A is equivalent to the original 3.8 A specification, confirming compatible performance under peak current conditions.