DR124-270-R Equivalent & Substitute Parts Reference

Part Overview

The DR124-270-R is a 27 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is designed for applications requiring fixed inductance with moderate current handling capability. The part is actively produced and widely available in inventory (663 pcs in stock). Equivalent and substitute parts are identified to provide design flexibility, support supply chain continuity, and accommodate specific application requirements where alternative electrical or mechanical characteristics are acceptable within defined parameters.

Substiute Parts

DR124-270-R

Eaton - Electronics DivisionIn Stock: 731DR124-270-R Datasheet

Current PartRFQ

SRR1240-270M

Bourns Inc.In Stock: 3435SRR1240-270M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DR124-270-R is determined by strict alignment with the following critical parameters:

Mandatory Matching Criteria:

• Inductance value: 27 µH (exact match required)
• Inductance tolerance: ±20% (identical specification)
• Core type: Ferrite drum core, wirewound construction
• Shielding: Shielded configuration
• Mounting: Surface mount, nonstandard package
• Physical dimensions: 12.50 x 12.50 x 4.50 mm (length x width x height)
• Operating temperature: -40°C to 125°C minimum
• RoHS compliance: ROHS3 Compliant

Acceptable Variation Parameters:

• Current rating: Substitute must equal or exceed 2.8 A
• DC resistance: Substitute may vary; lower values are electrically favorable
• Saturation current: Substitute specification acceptable if application current remains below saturation point
• Frequency characteristics: Variations acceptable if not specified as critical in application

The SRR1240-270M from Bourns Inc. meets all mandatory matching criteria and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

DR124-270-R Selection Criteria:

• Primary choice when Eaton component availability and supply chain preference are prioritized
• Suitable for applications with current requirements up to 2.8 A continuous operation
• Saturation current of 3.44 A provides margin for transient current conditions
• Lower DC resistance (80 mOhm max) reduces power dissipation in current-sensitive applications
• Active product status ensures long-term availability and manufacturing consistency

SRR1240-270M Selection Criteria:

• Suitable for applications with continuous current requirements up to 2.55 A
• Higher inventory availability (3353 pcs in stock) supports rapid procurement
• Acceptable for designs where application current remains below 2.35 A saturation point
• Slightly higher DC resistance (85 mOhm max) acceptable in applications where power loss is not critical
• Active product status and ROHS3 compliance ensure regulatory alignment
• Identical physical footprint and operating temperature range ensure direct PCB compatibility

Substitution Feasibility: Both parts are ROHS3 compliant, actively manufactured, and packaged identically. Selection between DR124-270-R and SRR1240-270M depends on application current requirements and design margin specifications. Applications operating below 2.55 A continuous current support either component. Applications requiring current operation between 2.55 A and 2.8 A require the DR124-270-R.

Frequently Asked Questions (FAQ)

Q: Can SRR1240-270M replace DR124-270-R in all applications?

A: Substitution is valid only when application continuous current does not exceed 2.55 A. The SRR1240-270M has lower current rating (2.55 A vs. 2.8 A) and lower saturation current (2.35 A vs. 3.44 A). Applications requiring operation above 2.55 A continuous current must use DR124-270-R.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 12.50 x 12.50 x 4.50 mm (length x width x height). PCB footprint and assembly compatibility are identical. Both use surface mount technology with nonstandard package configuration.

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

A: DR124-270-R specifies 80 mOhm maximum; SRR1240-270M specifies 85 mOhm maximum. The 5 mOhm difference results in slightly higher power dissipation with the Bourns component. In applications where power loss is critical, the Eaton part is preferred.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both DR124-270-R and SRR1240-270M are ROHS3 compliant. Both operate across -40°C to 125°C temperature range. Both are packaged in Tape & Reel format suitable for automated assembly.

Q: What is the inductance tolerance for both parts?

A: Both parts specify ±20% inductance tolerance at 100 kHz test frequency. This tolerance applies equally to DR124-270-R and SRR1240-270M.

Q: Which part should be selected for new designs?

A: Selection depends on application current requirements. For designs with continuous current up to 2.55 A, either part is acceptable. For designs requiring 2.55 A to 2.8 A continuous operation, DR124-270-R is required. For supply chain flexibility, SRR1240-270M offers higher inventory availability.

Q: Are frequency characteristics specified for both parts?

A: SRR1240-270M provides frequency data: Q of 16 at 2.52 MHz and self-resonant frequency of 15.5 MHz. DR124-270-R does not specify these parameters. If frequency response is application-critical, SRR1240-270M provides documented performance data.