LDS0705-331M-R Equivalent & Substitute Parts

Part Overview

The LDS0705-331M-R is a 330 µH shielded drum core wirewound inductor manufactured by Eaton - Electronics Division. This surface mount component is rated for 470 mA continuous current with a DC resistance of 1.06 Ohm and operates across the temperature range of -40°C to 125°C. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement continuity. Substitute parts must maintain the same inductance value, shielding characteristics, and thermal operating range while accommodating minor variations in current ratings and DC resistance within acceptable engineering tolerances.

Substiute Parts

LDS0705-331M-R

Eaton - Electronics DivisionIn Stock: 810LDS0705-331M-R Datasheet

Current PartRFQ

CDRR75NP-331MC

Sumida America Components Inc.In Stock: 6771CDRR75NP-331MC Datasheet

SimilarRFQ

CDRR7D45T125NP-331MC

Sumida America Components Inc.In Stock: 2996CDRR7D45T125NP-331MC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LDS0705-331M-R is determined by strict adherence to the following parameters:

Primary Substitution Criteria:

• Inductance value: 330 µH (fixed requirement)
• Inductance tolerance: ±20% (fixed requirement)
• Core material: Ferrite (fixed requirement)
• Shielding: Shielded (fixed requirement)
• Operating temperature range: -40°C to 125°C (fixed requirement)
• Mounting type: Surface Mount (fixed requirement)
• Inductance test frequency: 100 kHz (fixed requirement)

Secondary Compatibility Parameters (allowable variation):

• Current rating: Minimum 440 mA acceptable (original rated 470 mA)
• DC resistance: 1.05 Ohm to 1.15 Ohm acceptable (original 1.06 Ohm)
• Saturation current: Variation permitted based on core design
• Physical dimensions: Minor variation acceptable within surface mount constraints
• Packaging format: Tape & Reel acceptable for active production parts

Both substitute parts listed below satisfy all primary criteria and fall within acceptable ranges for secondary parameters.

Parameter Comparison

Engineering Selection Recommendations

CDRR75NP-331MC (Sumida America Components Inc.)

This substitute part is active in production and carries ROHS3 compliance certification. The current rating of 450 mA is 4.3% lower than the original LDS0705-331M-R specification of 470 mA. The DC resistance of 1.05 Ohm Max is within 0.9% of the original 1.06 Ohm specification. This part is suitable for applications where the 450 mA current rating meets circuit requirements. The saturation current of 250 mA is significantly lower than the original 438 mA, indicating a different core design approach.

CDRR7D45T125NP-331MC (Sumida America Components Inc.)

This substitute part is active in production and carries both RoHS compliance and AEC-Q200 automotive qualification ratings. The current rating of 440 mA is 6.4% lower than the original specification. The DC resistance of 1.15 Ohm is 8.5% higher than the original 1.06 Ohm specification. The saturation current of 350 mA provides better margin relative to the original 438 mA specification. This part is suitable for applications requiring automotive-grade reliability and compliance certifications.

Selection Basis:

Both substitute parts maintain identical inductance values, tolerance specifications, core materials, shielding characteristics, and operating temperature ranges. The choice between substitutes depends on application current requirements and compliance certifications needed. CDRR7D45T125NP-331MC is recommended for automotive or mission-critical applications requiring AEC-Q200 qualification. CDRR75NP-331MC is recommended for general industrial applications where ROHS3 compliance is the primary regulatory requirement.

Frequently Asked Questions (FAQ)

Q: Can CDRR75NP-331MC be used as a direct replacement for LDS0705-331M-R in all applications?

A: CDRR75NP-331MC is electrically compatible when the circuit design accommodates a maximum continuous current of 450 mA. The inductance value, tolerance, core material, shielding, and operating temperature range are identical. DC resistance variation of 0.9% is within typical engineering tolerances. Physical dimensions differ slightly (6.90mm x 6.90mm versus 7.80mm x 7.00mm), requiring PCB layout verification.

Q: What is the significance of the saturation current difference between the main part and substitutes?

A: Saturation current indicates the current level at which the inductor's inductance begins to degrade due to core saturation. The LDS0705-331M-R has a saturation current of 438 mA, while CDRR75NP-331MC is rated at 250 mA and CDRR7D45T125NP-331MC at 350 mA. Applications operating near or above these saturation levels will experience inductance reduction. Circuit designs must ensure operating current remains below the saturation specification of the selected substitute.

Q: Are there packaging differences between the main part and substitutes?

A: The LDS0705-331M-R packaging format is not specified in available documentation. Both substitute parts are supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount production. This packaging format is compatible with automated assembly equipment. Verify tape specifications and reel dimensions with the supplier if custom packaging is required.

Q: Which substitute part should be selected for automotive applications?

A: CDRR7D45T125NP-331MC is qualified to AEC-Q200 automotive standards and carries RoHS compliance certification. This part is the appropriate selection for automotive or safety-critical applications requiring industry-standard reliability qualifications. CDRR75NP-331MC does not carry AEC-Q200 certification and is suitable for general industrial applications.

Q: How do the DC resistance values affect circuit performance?

A: DC resistance directly impacts power dissipation and voltage drop across the inductor. The LDS0705-331M-R specifies 1.06 Ohm, CDRR75NP-331MC specifies 1.05 Ohm Max, and CDRR7D45T125NP-331MC specifies 1.15 Ohm. At the rated current of 470 mA, power dissipation differences are: original part 0.234 W, CDRR75NP-331MC 0.232 W, and CDRR7D45T125NP-331MC 0.254 W. Circuit thermal analysis must account for these variations in high-power applications.

Q: Is the ±20% inductance tolerance the same across all three parts?

A: Yes. All three parts specify ±20% inductance tolerance at 100 kHz test frequency. This tolerance band is identical and represents the allowable variation from the nominal 330 µH specification. Circuit designs must accommodate this tolerance range in all three parts.