SRP1040-100M Equivalent & Substitute Parts

Part Overview

The SRP1040-100M is a 10 µH shielded inductor manufactured by Bourns Inc., rated for 5 A continuous current with a maximum DC resistance of 35 mOhm. This component features an iron core construction and operates across a temperature range of -55°C to 150°C. The part is classified as obsolete, making identification of suitable equivalent components essential for ongoing design support and production continuity.

Substiute Parts

SRP1040-100M

Bourns Inc.In Stock: 922SRP1040-100M Datasheet

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SRP1038A-100M

Bourns Inc.In Stock: 72869SRP1038A-100M Datasheet

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SPD127R-103M

API Delevan Inc.In Stock: 827SPD127R-103M Datasheet

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UP2-100-R

Eaton - Electronics DivisionIn Stock: 944UP2-100-R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SRP1040-100M is determined by the following critical parameters: inductance value (10 µH), inductance tolerance (±20%), shielding requirement (shielded), current rating capability (minimum 5 A), DC resistance (≤35 mOhm), saturation current (≥9 A), operating temperature range compatibility, and surface mount packaging. The substitute parts listed maintain the core electrical specifications while varying in core material composition, current handling capacity, and thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

SRP1038A-100M represents the primary substitute for the SRP1040-100M. This Bourns Inc. component maintains identical inductance and tolerance specifications while offering superior current handling (7.5 A vs. 5 A) and lower DC resistance (30 mOhm vs. 35 mOhm). The SRP1038A-100M is active in production, ROHS3 compliant, and rated for the same upper temperature limit of 150°C. The carbonyl powder core construction provides enhanced performance characteristics compared to the iron core of the original part.

SPD127R-103M from API Delevan Inc. serves as a secondary substitute option. This ferrite-core inductor meets the 10 µH inductance requirement with adequate current rating (5.4 A) and acceptable DC resistance (40 mOhm). However, the maximum operating temperature is limited to 125°C, which represents a 25°C reduction from the original specification. This part is suitable for applications where the lower temperature ceiling does not present a constraint.

UP2-100-R from Eaton Electronics Division is not recommended as a direct substitute due to its unshielded construction, which conflicts with the shielded requirement of the SRP1040-100M. Additionally, the saturation current rating of 3.3 A falls below the original part's 9 A specification, and the continuous current rating of 4.3 A is marginal relative to the 5 A requirement.

Frequently Asked Questions (FAQ)

Q: Can the SRP1038A-100M directly replace the SRP1040-100M in all applications?

A: The SRP1038A-100M is electrically compatible with the SRP1040-100M for applications requiring 10 µH inductance at 5 A continuous current. The substitute offers improved specifications in current handling and DC resistance. Physical dimensions differ slightly (11.00mm x 10.00mm vs. 11.80mm x 10.50mm), requiring verification of PCB layout compatibility.

Q: What is the significance of the shielding difference between SRP1040-100M and UP2-100-R?

A: Shielding reduces electromagnetic interference (EMI) radiation from the inductor. The SRP1040-100M is shielded; the UP2-100-R is unshielded. In applications where EMI control is critical, the unshielded substitute is not appropriate. The UP2-100-R also exhibits insufficient saturation current (3.3 A) relative to the original specification (9 A).

Q: Are all substitute parts RoHS compliant?

A: Yes. The SRP1038A-100M and SPD127R-103M are ROHS3 compliant. The UP2-100-R is RoHS compliant. All three substitutes meet regulatory requirements for hazardous substance restrictions.

Q: What are the temperature operating range implications of SPD127R-103M?

A: The SPD127R-103M operates from -55°C to 125°C, compared to the SRP1040-100M range of -55°C to 150°C. The 25°C reduction in maximum operating temperature may impact applications requiring sustained operation at elevated temperatures above 125°C.

Q: How do core material differences affect inductor performance?

A: The SRP1040-100M uses iron core construction. The SRP1038A-100M employs carbonyl powder core, and the SPD127R-103M uses ferrite core. Core material influences DC resistance, saturation characteristics, frequency response, and thermal stability. The SRP1038A-100M's carbonyl powder core delivers lower DC resistance and higher saturation current than the original iron core design.