LD2-121-R Equivalent & Substitute Parts

Part Overview

The LD2-121-R is a 120 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 1.43 A continuous current with a maximum DC resistance of 470 mOhm 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 suitability for standard storage and handling conditions. As an active product with 896 pieces in stock, the LD2-121-R serves applications requiring fixed inductance in compact form factors. Equivalent and substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity.

Substiute Parts

LD2-121-R

Eaton - Electronics DivisionIn Stock: 922LD2-121-R Datasheet

Current PartRFQ

SDR0805-121KL

Bourns Inc.In Stock: 9373SDR0805-121KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LD2-121-R is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Inductance value: 120 µH (exact match required)
• Core type: Ferrite drum core, wirewound, unshielded
• Mounting: Surface mount, nonstandard package
• Operating temperature range: -40°C to 125°C minimum
• RoHS compliance status: Active product with current certification

Secondary Compatibility Factors:

• Current rating: Substitute must support the application's maximum current requirement
• DC resistance: Must not exceed application thermal and efficiency limits
• Saturation current: Must remain above the circuit's peak current demand
• Inductance tolerance: Acceptable variance within circuit design specifications

The SDR0805-121KL from Bourns Inc. qualifies as a substitute based on matching inductance value, core material, shielding configuration, mounting type, operating temperature range, and RoHS compliance status. Differences in current rating, DC resistance, and inductance tolerance are documented for engineering evaluation.

Parameter Comparison

Engineering Selection Recommendations

LD2-121-R Selection Criteria: The LD2-121-R is the primary choice for applications requiring a current rating of 1.43 A. This part carries RoHS Compliant certification and maintains active product status with established supply availability (896 pieces in stock). The ±20% inductance tolerance is acceptable for general-purpose filtering and energy storage applications where tighter tolerance is not specified.

SDR0805-121KL Selection Criteria: The SDR0805-121KL from Bourns serves as a substitute for applications with current requirements not exceeding 660 mA. This part offers superior inductance tolerance (±10% versus ±20%), supporting designs requiring tighter inductance accuracy. ROHS3 Compliant status indicates compliance with the latest RoHS directives. The substitute maintains identical operating temperature range and core material specifications. Inventory availability is higher (9340 pieces in stock), supporting high-volume procurement scenarios.

Compliance Considerations: Both parts are RoHS compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating equivalent handling and storage requirements. Both operate across -40°C to 125°C, supporting identical thermal application ranges.

Frequently Asked Questions (FAQ)

Q: Can the SDR0805-121KL replace the LD2-121-R in all applications?

A: The SDR0805-121KL is a substitute only for applications where the circuit current does not exceed 660 mA. The LD2-121-R supports 1.43 A continuous current, while the substitute is rated for 660 mA. If the application requires the full 1.43 A rating, the LD2-121-R must be used.

Q: What is the difference in inductance tolerance between these parts?

A: The LD2-121-R carries ±20% inductance tolerance, while the SDR0805-121KL carries ±10% tolerance. For circuits requiring tighter inductance accuracy, the SDR0805-121KL provides superior tolerance performance.

Q: Are the physical dimensions compatible?

A: Both parts are surface mount components with similar footprints. The LD2-121-R measures 0.307" L x 0.276" W (7.80mm x 7.00mm) with 0.197" (5.00mm) maximum seated height. The SDR0805-121KL measures 0.307" L x 0.307" W (7.80mm x 7.80mm) with 0.209" (5.30mm) maximum seated height. The width and height differences are minimal and typically accommodate standard PCB layouts designed for nonstandard surface mount packages.

Q: Do both parts meet RoHS requirements?

A: Yes. The LD2-121-R is RoHS Compliant, and the SDR0805-121KL is ROHS3 Compliant. Both meet current RoHS directives and are suitable for applications requiring RoHS certification.

Q: What is the DC resistance difference, and does it matter?

A: The LD2-121-R has a maximum DC resistance of 470 mOhm, while the SDR0805-121KL has a maximum of 480 mOhm. This 10 mOhm difference is negligible for most applications and does not affect substitution decisions based on electrical performance.

Q: Which part should I choose for new designs?

A: For new designs, select based on current requirements. If the circuit requires 1.43 A or higher, use the LD2-121-R. If the circuit operates at 660 mA or below and requires tighter inductance tolerance, the SDR0805-121KL is suitable. Both parts carry active product status and adequate inventory.