DR1040-2R5-R Equivalent & Substitute Parts

Part Overview

The DR1040-2R5-R is a 2.5 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 6.1 A continuous current with a maximum DC resistance of 9 mOhm and operates across the temperature range of -40°C to 125°C. The part is currently active in production with 3,750 units in stock. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to supply constraints, design flexibility, or inventory availability.

Substiute Parts

DR1040-2R5-R

Eaton - Electronics DivisionIn Stock: 3798DR1040-2R5-R Datasheet

Current PartRFQ

SRU1038-2R5Y

Bourns Inc.In Stock: 1938SRU1038-2R5Y Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DR1040-2R5-R are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Inductance value: 2.5 µH
• Inductance tolerance: ±30%
• Current rating: 6.1 A minimum
• Core type: Ferrite drum core, shielded
• Mounting: Surface mount
• Operating temperature range: -40°C to 125°C minimum
• RoHS3 compliance
• MSL rating: 1 (Unlimited)

Secondary Consideration:

• DC resistance (DCR) within acceptable limits for the application
• Physical package dimensions compatible with board layout constraints

The SRU1038-2R5Y from Bourns Inc. meets all primary matching criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the DR1040-2R5-R and SRU1038-2R5Y are active production components with ROHS3 compliance and unlimited moisture sensitivity ratings, making them suitable for industrial and commercial applications. The primary difference between these parts is the DC resistance specification: the DR1040-2R5-R offers a lower maximum DCR of 9 mOhm compared to the SRU1038-2R5Y at 12.5 mOhm. This difference may be significant in applications where power dissipation or thermal management is critical.

The saturation current (Isat) differs between the two parts: DR1040-2R5-R at 7.8 A versus SRU1038-2R5Y at 6 A. Applications requiring operation near saturation limits should account for this specification variance.

Physical dimensions are comparable, with the SRU1038-2R5Y being slightly smaller (10.00mm x 10.00mm versus 10.50mm x 10.30mm), which may provide layout advantages in space-constrained designs. Both parts maintain compatible height profiles within 4.00mm to 4.10mm.

Selection between these parts should be based on specific application requirements regarding DC resistance, saturation current limits, and available board space.

Frequently Asked Questions (FAQ)

Q: Can the SRU1038-2R5Y directly replace the DR1040-2R5-R in all applications?

A: The SRU1038-2R5Y meets the core electrical specifications (2.5 µH inductance, 6.1 A current rating, ±30% tolerance, ferrite shielded drum core). However, the higher DC resistance (12.5 mOhm versus 9 mOhm) and lower saturation current (6 A versus 7.8 A) must be evaluated against application requirements. Direct substitution is valid when these parameter differences do not impact circuit performance.

Q: What is the significance of the DC resistance difference between these parts?

A: DC resistance directly affects power dissipation in the inductor. The DR1040-2R5-R with 9 mOhm maximum DCR dissipates less power than the SRU1038-2R5Y at 12.5 mOhm under the same current conditions. Applications with strict thermal budgets or high continuous current operation should prioritize the lower DCR specification.

Q: Are there package compatibility concerns between these inductors?

A: Both parts are surface mount components with nonstandard packages. The SRU1038-2R5Y is slightly smaller in footprint (10.00mm x 10.00mm versus 10.50mm x 10.30mm) and marginally taller (4.10mm versus 4.00mm). PCB layout and solder reflow profiles should be verified for the specific package geometry when substituting.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the DR1040-2R5-R and SRU1038-2R5Y are ROHS3 compliant, REACH unaffected, classified as EAR99, and carry MSL rating 1 (unlimited moisture sensitivity). Both are suitable for equivalent regulatory and environmental requirements.

Q: What is the inductance tolerance, and how does it affect circuit design?

A: Both parts carry ±30% inductance tolerance at 100 kHz test frequency. This tolerance range must be accommodated in circuit design through component selection, tuning networks, or tolerance analysis to ensure performance specifications are met across the full tolerance band.

Q: How do the saturation current ratings differ in practical application?

A: The DR1040-2R5-R saturates at 7.8 A while the SRU1038-2R5Y saturates at 6 A. Both parts are rated for 6.1 A continuous current. Applications operating near the 6.1 A limit should use the DR1040-2R5-R to maintain margin above saturation. The SRU1038-2R5Y provides less headroom and may exhibit inductance degradation closer to rated current.