LD1-100-R Equivalent & Substitute Parts Reference

Part Overview

The LD1-100-R is a 10 µH unshielded drum core wirewound inductor manufactured by Eaton Electronics Division. This surface mount component is rated for 1.13 A continuous current with a maximum DC resistance of 182 mOhm and operates across the temperature range of -40°C to 125°C. The part maintains Active product status and is RoHS Compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while accommodating different packaging formats, inventory availability, or design flexibility requirements.

Key Parameters

Parameter	Value	Unit
Inductance	10	µH
Inductance Tolerance	±20%	-
Current Rating	1.13	A
DC Resistance (Max)	182	mOhm
Core Material	Ferrite	-
Shielding	Unshielded	-
Operating Temperature Range	-40°C to 125°C	-
Mounting Type	Surface Mount	-
RoHS Status	RoHS Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the LD1-100-R are classified based on strict alignment with the following electrical and mechanical criteria:

Direct Substitutes maintain identical inductance value (10 µH), equivalent current ratings within 2% variance, DC resistance within acceptable operating margins, ferrite core construction, surface mount configuration, and compatible temperature operating ranges. Packaging format differences (Cut Tape versus Tape & Reel) do not affect electrical equivalency.

Similar Substitutes share the same inductance specification and core material but may incorporate design variations such as shielding configuration or dimensional differences that require circuit-level evaluation for specific applications.

The substitution logic is based exclusively on:

Inductance value and tolerance
Current rating and saturation current
DC resistance maximum specification
Core material type
Operating temperature range compatibility
Surface mount package compatibility
RoHS and regulatory compliance status

Parameter Comparison

Parameter	LD1-100-R (Eaton)	SDR0403-100ML (Bourns)	VLCF5020T-100M1R1-1 (TDK)
Inductance	10 µH	10 µH	10 µH
Inductance Tolerance	±20%	±20%	±20%
Current Rating	1.13 A	1.15 A	1.13 A
Current - Saturation	1.28 A	1.7 A	1.13 A
DC Resistance (Max)	182 mOhm	180 mOhm	237 mOhm
Core Material	Ferrite	Ferrite	Ferrite
Type	Drum Core, Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Shielding	Unshielded	Unshielded	Shielded
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Size (L x W)	4.50mm x 4.00mm	4.50mm x 4.00mm	5.00mm x 5.00mm
Height (Max)	3.20mm	3.50mm	2.00mm
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

SDR0403-100ML (Bourns Inc.) qualifies as a direct substitute for the LD1-100-R. This part maintains identical inductance specification, equivalent current rating (1.15 A versus 1.13 A), superior DC resistance performance (180 mOhm versus 182 mOhm maximum), and identical operating temperature range (-40°C to 125°C). Both components feature ferrite drum core construction, unshielded configuration, and surface mount mounting. The SDR0403-100ML is ROHS3 Compliant with MSL 1 rating. Packaging differs (Tape & Reel versus Cut Tape), but this does not affect electrical equivalency. Higher saturation current (1.7 A) provides additional design margin.

VLCF5020T-100M1R1-1 (TDK Corporation) is classified as a similar substitute with design trade-offs requiring evaluation. This part maintains the 10 µH inductance specification and ferrite core material but incorporates shielding, which the LD1-100-R does not. DC resistance is elevated to 237 mOhm maximum (30% higher than the main part), and the operating temperature upper limit is reduced to 105°C (20°C lower than the main part). Physical dimensions differ (5.00mm x 5.00mm versus 4.50mm x 4.00mm), though height is reduced (2.00mm versus 3.20mm). The VLCF5020T-100M1R1-1 is ROHS3 Compliant with MSL 1 rating. Selection of this part requires confirmation that the elevated DC resistance and reduced temperature range are acceptable for the intended application.

All substitute parts maintain Active product status and regulatory compliance (RoHS, REACH, EAR99 classification).

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-100ML directly replace the LD1-100-R without circuit modification?

A: Yes. The SDR0403-100ML maintains electrical equivalency across all critical parameters: identical 10 µH inductance, equivalent 1.15 A current rating, superior DC resistance (180 mOhm), matching ferrite core construction, identical unshielded configuration, and identical operating temperature range (-40°C to 125°C). Packaging format difference (Tape & Reel versus Cut Tape) does not affect electrical performance. PCB footprint compatibility must be verified based on identical 4.50mm x 4.00mm dimensions.

Q: What are the limitations of the VLCF5020T-100M1R1-1 as a substitute?

A: The VLCF5020T-100M1R1-1 introduces three design trade-offs: (1) DC resistance is 237 mOhm maximum, representing a 30% increase over the LD1-100-R specification of 182 mOhm, which increases power dissipation and heat generation; (2) operating temperature upper limit is 105°C, reducing the available thermal margin by 20°C compared to the LD1-100-R; (3) physical footprint is larger (5.00mm x 5.00mm versus 4.50mm x 4.00mm), though component height is reduced. The shielded configuration may provide EMI benefits in certain applications but is not present in the original design.

Q: Are all substitute parts RoHS compliant?

A: Yes. The LD1-100-R is RoHS Compliant. The SDR0403-100ML and VLCF5020T-100M1R1-1 are both ROHS3 Compliant, representing an updated compliance standard. All parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) and Digi-Reel® packaging is used for lower-volume applications and manual assembly processes. Tape & Reel (TR) packaging is used for high-volume automated assembly. The LD1-100-R uses Cut Tape packaging; the SDR0403-100ML uses Tape & Reel packaging. Electrical specifications are identical; packaging selection depends on manufacturing process requirements and order volume.

Q: Can the VLCF5020T-100M1R1-1 be used in applications requiring the full -40°C to 125°C temperature range?

A: No. The VLCF5020T-100M1R1-1 operating temperature range is -40°C to 105°C, limiting operation to 105°C maximum. Applications requiring sustained operation above 105°C must use the LD1-100-R or SDR0403-100ML, both rated to 125°C.

Q: How does saturation current affect part selection?

A: Saturation current (Isat) indicates the current level at which the inductor begins to lose inductance due to core saturation. The LD1-100-R has Isat of 1.28 A, the SDR0403-100ML has Isat of 1.7 A, and the VLCF5020T-100M1R1-1 has Isat of 1.13 A. The SDR0403-100ML provides the highest saturation margin. The VLCF5020T-100M1R1-1 saturation current equals its continuous current rating, indicating no design margin above nominal operation.

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