LD1-221-R Equivalent & Substitute Parts Reference

Part Overview

The LD1-221-R is a 220 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 260 mA continuous current with a maximum DC resistance of 3.42Ohm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. The LD1-221-R is currently in Active product status with 664 pieces available in inventory. Equivalent substitute parts are identified to support design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Substiute Parts

LD1-221-R

Eaton - Electronics DivisionIn Stock: 683LD1-221-R Datasheet

Current PartRFQ

SDR0403-221KL

Bourns Inc.In Stock: 5016SDR0403-221KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LD1-221-R are identified based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Electrical Parameters:

• Inductance value of 220 µH with ±10% tolerance
• Ferrite drum core construction with unshielded configuration
• Operating temperature range of -40°C to 125°C
• Surface mount package type

Mechanical Parameters:

• Package dimensions of 4.50mm L x 4.00mm W x 3.50mm H (nonstandard case)
• Tape & Reel (TR) packaging format

Functional Compatibility Criteria:

• Current rating capability sufficient for application requirements
• Saturation current (Isat) of 330 mA or greater
• DC resistance within acceptable operating parameters
• RoHS compliance and MSL rating of 1

The SDR0403-221KL from Bourns Inc. meets all core substitution criteria. While the current rating differs (220 mA versus 260 mA), the saturation current remains at 330 mA, and the DC resistance of 4.4Ohm is within acceptable tolerance for equivalent circuit performance. Both parts share identical package dimensions, ferrite core material, unshielded design, and operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

LD1-221-R Selection Criteria: The LD1-221-R is appropriate for applications requiring the specified 260 mA continuous current rating with 3.42Ohm maximum DC resistance. The part is Active in product status with established supply availability (664 pieces in stock). RoHS Compliance and MSL 1 rating support standard manufacturing and storage conditions without special handling requirements.

SDR0403-221KL Selection Criteria: The SDR0403-221KL from Bourns Inc. is appropriate for applications where the 220 mA current rating is sufficient and the higher DC resistance of 4.4Ohm is acceptable within circuit design parameters. This part is also Active in product status with higher inventory availability (4972 pieces in stock). ROHS3 Compliance indicates alignment with current regulatory standards. The SDR0403-221KL is suitable as a substitute when the LD1-221-R is unavailable, provided application current requirements do not exceed 220 mA continuous operation.

Substitution Constraints: Applications requiring continuous current operation above 220 mA should not use the SDR0403-221KL as a substitute. The increased DC resistance of 4.4Ohm versus 3.42Ohm will result in higher power dissipation and must be evaluated against thermal design margins. Both parts maintain identical saturation current (330 mA) and package dimensions, ensuring mechanical and thermal footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-221KL replace the LD1-221-R in all applications?

A: The SDR0403-221KL is a functional equivalent for applications where continuous current operation does not exceed 220 mA. The higher DC resistance (4.4Ohm versus 3.42Ohm) must be evaluated for power dissipation impact. Both parts share identical inductance, package dimensions, core material, and operating temperature range.

Q: What is the impact of the 0.98Ohm difference in DC resistance?

A: The increased DC resistance in the SDR0403-221KL results in higher resistive losses. At 220 mA continuous current, the SDR0403-221KL dissipates approximately 0.213 watts compared to 0.184 watts for the LD1-221-R. Circuit thermal design must accommodate this additional power dissipation.

Q: Are the package dimensions identical between both parts?

A: Yes. Both the LD1-221-R and SDR0403-221KL are packaged in identical nonstandard surface mount cases measuring 4.50mm length x 4.00mm width x 3.50mm height. PCB footprints and assembly processes are interchangeable.

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

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current regulatory version. Both parts meet hazardous substance restrictions and are suitable for standard manufacturing environments.

Q: Can I use the SDR0403-221KL if my application requires 260 mA continuous current?

A: No. The SDR0403-221KL is rated for 220 mA continuous current. Using this part in a 260 mA application exceeds the component's current rating and may result in thermal stress or component failure. The LD1-221-R is the appropriate selection for 260 mA continuous operation.

Q: Are both parts available in Tape & Reel packaging?

A: Yes. Both the LD1-221-R and SDR0403-221KL are supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Q: What is MSL 1 (Unlimited) moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. Both parts carry this rating, eliminating the need for dry-pack storage or baking procedures prior to assembly.