LD1-331-R Equivalent & Substitute Parts

Part Overview

The LD1-331-R is a 330 µH unshielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 220 mA continuous current with a maximum DC resistance of 4.7 Ohm and operates across the temperature range of -40°C to 125°C. The part is RoHS Compliant and carries an Active product status. Substitute parts are identified when equivalent inductance values, current ratings, and physical dimensions align within acceptable engineering tolerances, enabling component interchangeability in circuit applications where the primary electrical specifications remain constant.

Substiute Parts

LD1-331-R

Eaton - Electronics DivisionIn Stock: 916LD1-331-R Datasheet

Current PartRFQ

SDR0403-331KL

Bourns Inc.In Stock: 50605SDR0403-331KL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LD1-331-R are identified based on strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Inductance value: 330 µH (±10% tolerance band)
• Core material and type: Ferrite drum core, unshielded construction
• Mounting technology: Surface mount
• Physical package dimensions: 4.50mm x 4.00mm x 3.50mm maximum
• Operating temperature range: -40°C to 125°C minimum
• RoHS compliance status: Active compliance requirement

Secondary Compatibility Parameters:

• Current rating: Minimum 170 mA acceptable for applications where LD1-331-R 220 mA rating is not fully utilized
• DC resistance: Values up to 6 Ohm maximum acceptable where circuit impedance tolerance permits
• Saturation current: Minimum 250 mA acceptable where transient current margins exist

The SDR0403-331KL from Bourns Inc. meets all primary substitution criteria and operates within acceptable secondary parameter ranges for equivalent circuit functionality.

Parameter Comparison

Engineering Selection Recommendations

LD1-331-R Selection Criteria: The LD1-331-R remains the primary choice for applications requiring the full 220 mA continuous current rating and 300 mA saturation current specification. This part carries Active product status and maintains RoHS Compliant certification. Selection is appropriate where current margins are critical and DC resistance must remain at or below 4.7 Ohm maximum.

SDR0403-331KL Selection Criteria: The SDR0403-331KL from Bourns Inc. is suitable as an equivalent substitute where circuit design permits operation at 170 mA continuous current and 250 mA saturation current. This part carries Active product status and meets ROHS3 Compliant certification, representing current regulatory compliance. The SDR0403-331KL is appropriate for applications where the reduced current ratings and increased DC resistance (6 Ohm maximum) fall within circuit tolerance specifications. Identical physical dimensions and operating temperature range ensure direct PCB footprint compatibility.

Compliance Considerations: Both parts maintain Active product status and comply with applicable RoHS standards. The SDR0403-331KL carries ROHS3 Compliant designation, reflecting current regulatory requirements. Both parts carry MSL 1 rating, indicating unlimited moisture sensitivity protection and standard handling procedures.

Frequently Asked Questions (FAQ)

Q: Can the SDR0403-331KL directly replace the LD1-331-R in all applications?

A: Direct replacement is possible only where circuit design accommodates the SDR0403-331KL's lower current rating (170 mA versus 220 mA) and higher DC resistance (6 Ohm versus 4.7 Ohm maximum). Applications operating at or near the LD1-331-R's 220 mA rating require engineering evaluation to confirm the substitute part operates within acceptable current and thermal margins.

Q: What is the impact of the 1.3 Ohm increase in DC resistance?

A: The SDR0403-331KL's 6 Ohm maximum DC resistance represents a 27.7% increase relative to the LD1-331-R's 4.7 Ohm maximum. This affects circuit impedance and power dissipation. Applications sensitive to DC resistance must evaluate whether the increased resistance remains within circuit tolerance specifications.

Q: Are the physical dimensions identical?

A: Yes. Both the LD1-331-R and SDR0403-331KL share identical package dimensions of 4.50mm length x 4.00mm width x 3.50mm maximum height. PCB footprint compatibility is confirmed, and no layout modifications are required.

Q: Do both parts operate across the same temperature range?

A: Yes. Both parts operate across the identical temperature range of -40°C to 125°C, ensuring thermal performance equivalence across standard industrial and commercial operating environments.

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

A: Both designations indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 Compliant reflects the current version of the RoHS directive and represents current regulatory alignment. Both parts meet applicable hazardous substance restrictions.

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

A: Yes. Both the LD1-331-R and SDR0403-331KL are supplied in Tape & Reel (TR) format, suitable for automated assembly processes and standard component handling procedures.

Q: What does MSL 1 (Unlimited) mean for storage and handling?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life under standard storage conditions. No special moisture control procedures or baking requirements are necessary prior to assembly, and the part does not require time-limited handling windows.