LD1-120-R Equivalent & Substitute Parts

Part Overview

The LD1-120-R is a 12 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.05 A continuous current with a maximum DC resistance of 210 mOhm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and classified as 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 needs.

Substiute Parts

LD1-120-R

Eaton - Electronics DivisionIn Stock: 951LD1-120-R Datasheet

Current PartRFQ

SDR0403-120ML

Bourns Inc.In Stock: 10157SDR0403-120ML Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LD1-120-R with the SDR0403-120ML is based on strict equivalence of the following critical parameters:

Electrical Equivalence:

• Inductance value: 12 µH with ±20% tolerance
• Current rating: 1.05 A continuous
• DC resistance: 210 mOhm maximum
• Core material: Ferrite, unshielded configuration

Mechanical Equivalence:

• Mounting type: Surface mount
• Package footprint: 0.177" L x 0.157" W (4.50mm x 4.00mm)
• Nonstandard package classification

Environmental & Compliance Equivalence:

• Operating temperature range: -40°C to 125°C
• Moisture sensitivity level: 1 (Unlimited)
• RoHS compliance status

The SDR0403-120ML meets all specified electrical and mechanical requirements for direct substitution in applications where the LD1-120-R is designated.

Parameter Comparison

Engineering Selection Recommendations

Both the LD1-120-R and SDR0403-120ML are Active product status components with full RoHS compliance. The SDR0403-120ML carries ROHS3 Compliant designation, indicating compliance with the most current RoHS standards. Both parts are packaged in Tape & Reel format suitable for automated assembly processes.

The SDR0403-120ML demonstrates a higher saturation current rating of 1.6 A compared to the LD1-120-R at 1.18 A, providing additional margin in applications approaching saturation limits. The seated height difference of 0.012" (0.30mm) between the two parts must be evaluated against PCB layout and clearance requirements.

Selection between these parts should be based on availability, supply chain lead times, and specific application requirements regarding saturation current performance and board clearance constraints.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-120ML replace the LD1-120-R in all applications?

A: The SDR0403-120ML meets all critical electrical and mechanical specifications for substitution. The inductance value, tolerance, current rating, and DC resistance are identical. Verify that the 0.012" (0.30mm) increase in seated height does not conflict with PCB clearance requirements in your specific application.

Q: What is the significance of the different saturation current ratings?

A: The LD1-120-R has an Isat of 1.18 A while the SDR0403-120ML has an Isat of 1.6 A. Both parts are rated for 1.05 A continuous current. The higher saturation rating on the Bourns part provides additional design margin if transient currents approach the saturation threshold.

Q: Are both parts suitable for automated assembly?

A: Yes. Both the LD1-120-R and SDR0403-120ML are supplied in Tape & Reel packaging and are classified as Moisture Sensitivity Level 1 (Unlimited), making them suitable for standard surface mount assembly processes without special handling requirements.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: ROHS3 Compliant indicates compliance with the most recent RoHS directive revision. Both designations confirm the parts meet hazardous substance restrictions. The SDR0403-120ML carries the more current ROHS3 designation.

Q: Are there any frequency-dependent differences between these parts?

A: The SDR0403-120ML provides Q factor and self-resonant frequency specifications (Q @ 28 at 2.52 MHz; SRF @ 30 MHz) while these parameters are not specified for the LD1-120-R. For applications sensitive to high-frequency performance, the Bourns part offers documented frequency response characteristics.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes, with the noted exception of the 0.012" (0.30mm) seated height difference. Verify clearance above the inductor location on your PCB layout. The identical footprint dimensions (0.177" x 0.157") ensure mechanical compatibility with existing land patterns.