DR124-180-R Equivalent & Substitute Parts

Part Overview

The DR124-180-R is an 18 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 3.4 A continuous current with a maximum DC resistance of 56.4 mOhm and operates across the temperature range of -40°C to 125°C. The part is ROHS3 compliant and carries an active product status. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, supply chain considerations, or design flexibility within established parameter tolerances.

Key Parameters

Parameter	Value	Unit
Inductance	18	µH
Inductance Tolerance	±20	%
Current Rating	3.4	A
DC Resistance (Max)	56.4	mOhm
Core Material	Ferrite	—
Shielding	Shielded	—
Mounting Type	Surface Mount	—
Package Dimensions	12.50 x 12.50 x 4.50	mm
Operating Temperature Range	-40 to 125	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the DR124-180-R is based on strict equivalence of the following electrical and mechanical parameters:

Critical Matching Parameters:

Inductance value: 18 µH at 100 kHz test frequency
Inductance tolerance: ±20%
Core type: Ferrite drum core, shielded construction
Mounting configuration: Surface mount, nonstandard package
Physical dimensions: 12.50 mm × 12.50 mm × 4.50 mm maximum height
Operating temperature range: -40°C to 125°C
RoHS compliance: ROHS3 Compliant

Acceptable Variation Parameters:

Current rating: Substitute must support minimum 3.2 A (within 94% of original 3.4 A specification)
DC resistance: Substitute must not exceed 56.4 mOhm maximum
Saturation current: Substitute specification acceptable if rated component meets application requirements

The SRR1240-180M from Bourns Inc. meets all critical matching parameters and acceptable variation thresholds for direct substitution.

Parameter Comparison

Parameter	DR124-180-R (Eaton)	SRR1240-180M (Bourns)	Match Status
Inductance	18 µH	18 µH	Exact Match
Inductance Tolerance	±20%	±20%	Exact Match
Current Rating	3.4 A	3.2 A	Compatible (94% of original)
DC Resistance (Max)	56.4 mOhm	55 mOhm	Compatible (Lower)
Core Material	Ferrite	Ferrite	Exact Match
Shielding	Shielded	Shielded	Exact Match
Mounting Type	Surface Mount	Surface Mount	Exact Match
Package Dimensions (L × W × H)	12.50 × 12.50 × 4.50 mm	12.50 × 12.50 × 4.50 mm	Exact Match
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	Exact Match
Inductance Test Frequency	100 kHz	100 kHz	Exact Match
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact Match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Exact Match
Product Status	Active	Active	Exact Match

Engineering Selection Recommendations

Both the DR124-180-R and SRR1240-180M are active products with ROHS3 compliance and identical operating temperature specifications. The SRR1240-180M provides a direct functional equivalent with the following considerations:

Current Rating Differential: The SRR1240-180M is rated for 3.2 A continuous current compared to the DR124-180-R at 3.4 A. This 0.2 A reduction represents a 5.9% decrease in current capacity. Selection of the substitute part is appropriate for applications where the design current requirement does not exceed 3.2 A.

DC Resistance Advantage: The SRR1240-180M exhibits lower DC resistance at 55 mOhm maximum versus 56.4 mOhm maximum, resulting in reduced resistive losses and improved thermal performance in equivalent operating conditions.

Compliance and Certification: Both parts maintain identical RoHS3 compliance status, moisture sensitivity level (MSL 1), and ECCN classification (EAR99), ensuring regulatory equivalence for procurement and deployment.

Physical and Electrical Compatibility: Identical package dimensions, inductance value, tolerance, and test frequency ensure direct mechanical and electrical interchangeability in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can the SRR1240-180M replace the DR124-180-R in all applications?

A: The SRR1240-180M is suitable for replacement in applications where the continuous current requirement does not exceed 3.2 A. If the design requires the full 3.4 A rating of the DR124-180-R, the substitute part is not appropriate. Verify application current requirements before substitution.

Q: What is the significance of the 0.2 A current rating difference?

A: The SRR1240-180M current rating of 3.2 A is 94% of the DR124-180-R specification. This difference is material for high-current applications. Applications operating at or below 3.2 A continuous current experience no functional limitation. Applications requiring current between 3.2 A and 3.4 A require evaluation against thermal and reliability requirements.

Q: Are the physical packages identical?

A: Yes. Both parts share identical dimensions of 12.50 mm length × 12.50 mm width × 4.50 mm maximum seated height. Direct footprint compatibility is confirmed for PCB layout and assembly processes.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the DR124-180-R and SRR1240-180M are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level) and EAR99 ECCN classification. Regulatory equivalence is established.

Q: What is the inductance tolerance for both parts?

A: Both parts carry ±20% inductance tolerance at the 100 kHz test frequency. This tolerance applies equally to both the main part and substitute, ensuring equivalent circuit performance within specified limits.

Q: How do the DC resistance values compare?

A: The SRR1240-180M maximum DC resistance of 55 mOhm is lower than the DR124-180-R maximum of 56.4 mOhm. Lower DC resistance reduces I²R losses and improves efficiency in power delivery applications.

Q: Are both parts available in tape and reel packaging?

A: Yes. Both the DR124-180-R and SRR1240-180M are supplied in tape and reel (TR) packaging suitable for automated assembly processes.

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