LD1-180-R Equivalent & Substitute Parts Reference

Part Overview

The LD1-180-R is an 18 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 830 mA continuous current with a maximum DC resistance of 338 mOhm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and carries an Active product status, indicating current availability and ongoing manufacturer support. Substitute parts are identified when equivalent electrical and mechanical specifications are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Inductance	18	µH
Inductance Tolerance	±20%	-
Current Rating	830	mA
Saturation Current (Isat)	980	mA
DC Resistance (DCR) Maximum	338	mOhm
Core Material	Ferrite	-
Shielding	Unshielded	-
Operating Temperature Range	-40 to 125	°C
Mounting Type	Surface Mount	-
Package Dimensions (L x W)	4.50 x 4.00	mm
Height - Seated (Max)	3.20	mm
RoHS Status	RoHS Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the LD1-180-R are qualified based on the following critical parameters that determine functional equivalence:

Electrical Parameters:

Inductance value of 18 µH with ±20% tolerance
Current rating minimum of 830 mA
Saturation current (Isat) sufficient to support operating conditions
DC resistance (DCR) within acceptable limits for thermal and efficiency performance

Mechanical Parameters:

Surface mount package configuration
Nonstandard package dimensions of 4.50mm L x 4.00mm W
Height compatibility with 3.20mm seated maximum

Environmental & Compliance Parameters:

Operating temperature range of -40°C to 125°C
RoHS compliance status
Moisture Sensitivity Level 1 (Unlimited)

The SDR0403-180ML from Bourns Inc. meets all substitution criteria within these defined parameters.

Parameter Comparison

Parameter	LD1-180-R (Eaton)	SDR0403-180ML (Bourns)	Compatibility
Inductance	18 µH	18 µH	Equivalent
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating	830 mA	840 mA	Substitute Rated Higher
Saturation Current (Isat)	980 mA	1.3 A	Substitute Rated Higher
DC Resistance (DCR) Maximum	338 mOhm	340 mOhm	Equivalent
Core Material	Ferrite	Ferrite	Equivalent
Shielding	Unshielded	Unshielded	Equivalent
Operating Temperature Range	-40 to 125°C	-40 to 125°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package Dimensions (L x W)	4.50 x 4.00 mm	4.50 x 4.00 mm	Equivalent
Height - Seated (Max)	3.20 mm	3.50 mm	Substitute 0.30 mm Taller
RoHS Status	RoHS Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The SDR0403-180ML qualifies as a direct substitute for the LD1-180-R based on electrical and mechanical parameter alignment. Both components are Active products with current manufacturer support and full RoHS compliance certification. The substitute part demonstrates equivalent or superior performance across all critical parameters:

Electrical specifications are matched or exceeded, with the SDR0403-180ML providing higher saturation current (1.3 A versus 980 mA) and equivalent DC resistance performance
Mechanical compatibility is maintained across footprint dimensions (4.50mm x 4.00mm)
Environmental operating range is identical (-40°C to 125°C)
Compliance certifications are current and equivalent (ROHS3 versus RoHS Compliant)

The only dimensional variance is seated height, where the SDR0403-180ML measures 3.50mm maximum versus 3.20mm for the LD1-180-R. This 0.30mm difference must be evaluated against specific PCB layout and enclosure clearance requirements in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-180ML be used as a direct replacement for the LD1-180-R in all applications?

A: The SDR0403-180ML meets all electrical and mechanical substitution criteria. The 0.30mm height difference (3.50mm versus 3.20mm) must be verified against PCB assembly and enclosure constraints specific to your design.

Q: Are the inductance values and tolerances identical between these parts?

A: Yes. Both components provide 18 µH inductance with ±20% tolerance, ensuring equivalent circuit performance in applications where this specification is required.

Q: What is the difference in current handling capability?

A: The LD1-180-R is rated for 830 mA continuous current with 980 mA saturation current. The SDR0403-180ML is rated for 840 mA continuous current with 1.3 A saturation current. The substitute part provides higher current capacity, making it suitable for equivalent or higher-current applications.

Q: Are both parts RoHS compliant?

A: Yes. The LD1-180-R carries RoHS Compliant certification, and the SDR0403-180ML carries ROHS3 Compliant certification. Both meet current environmental compliance requirements.

Q: What is the DC resistance difference between these inductors?

A: The LD1-180-R has a maximum DC resistance of 338 mOhm, while the SDR0403-180ML has a maximum of 340 mOhm. This 2 mOhm difference is negligible for most circuit applications and falls within normal manufacturing tolerance ranges.

Q: Do both parts have the same moisture sensitivity rating?

A: Yes. Both the LD1-180-R and SDR0403-180ML carry Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: What are the package dimensions for both parts?

A: Both components share identical footprint dimensions of 4.50mm length by 4.00mm width. The seated height differs by 0.30mm (LD1-180-R at 3.20mm maximum, SDR0403-180ML at 3.50mm maximum).

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