ELF-18D290T Equivalent & Substitute Parts

Part Overview

The ELF-18D290T is a 2-line common mode choke (CMC) designed for through-hole mounting with a maximum current rating of 1.3A and typical DC resistance of 186mOhm. Manufactured by Panasonic Electronic Components as part of the V series, this component is classified as obsolete. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure ongoing component availability for new production runs and field replacements.

Substiute Parts

ELF-18D290T

Panasonic Electronic ComponentsIn Stock: 702ELF-18D290T Datasheet

Current PartRFQ

B82731M2132A030

EPCOS - TDK ElectronicsIn Stock: 8131B82731M2132A030 Datasheet

SimilarRFQ

LF2020NP-222

Sumida America Components Inc.In Stock: 9372LF2020NP-222 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D290T is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Current Rating (Max): Must support minimum 1.3A
• Mounting Type: Must be through-hole
• Package / Case: Must be vertical, 4 PC pin configuration
• DC Resistance (DCR): Must be within acceptable operating range for the application
• Physical Dimensions: Must fit within or closely match the original footprint (21.00mm L x 16.00mm W, height ≤ 22.50mm)

Both identified substitute parts meet these core substitution criteria. The B82731M2132A030 and LF2020NP-222 maintain electrical compatibility through identical current ratings, line configuration, and mounting specifications. Variations in inductance values and DC resistance are within acceptable tolerances for common mode choke applications where the primary function is EMI filtering rather than precise inductance matching.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products from established manufacturers, ensuring long-term availability and supply chain stability compared to the obsolete ELF-18D290T.

B82731M2132A030 (EPCOS - TDK Electronics): This substitute carries ROHS3 compliance and holds multiple approval certifications (ENEC, UR, VDE), making it suitable for applications requiring regulatory compliance documentation. The slightly elevated DC resistance of 280mOhm compared to the original 186mOhm represents a 50% increase; this must be evaluated against thermal and power dissipation requirements of the specific application. Physical dimensions are nearly identical with a marginal width reduction (15.00mm vs. 16.00mm) and height reduction (20.50mm vs. 22.50mm), providing improved PCB layout flexibility.

LF2020NP-222 (Sumida America Components Inc.): This substitute maintains the closest physical footprint match to the original part, with identical length and height dimensions (21.00mm L x 22.50mm H) and minimal width variation (16.20mm vs. 16.00mm). DC resistance of 240mOhm represents a 29% increase over the original specification. ROHS3 compliance is confirmed. This part is optimal for applications where PCB layout constraints require exact dimensional compatibility.

Selection between these two substitutes should be based on application-specific requirements for thermal performance (DCR tolerance) and physical space constraints.

Frequently Asked Questions (FAQ)

Q: Can the B82731M2132A030 and LF2020NP-222 be used interchangeably with the ELF-18D290T?

A: Both parts meet the core substitution criteria: 2-line configuration, 1.3A current rating, through-hole mounting, and vertical 4-pin package. However, the increased DC resistance values (280mOhm and 240mOhm respectively, versus 186mOhm original) will result in higher power dissipation. Thermal analysis of the specific application is required to confirm suitability.

Q: What is the impact of higher DC resistance on circuit performance?

A: Increased DC resistance generates additional heat during operation and causes greater voltage drop across the component. For common mode choke applications where EMI filtering is the primary function, this impact is typically acceptable within normal operating ranges. Applications with tight thermal budgets or high continuous current must be evaluated individually.

Q: Are there dimensional compatibility concerns with the substitute parts?

A: The B82731M2132A030 has slightly reduced width (15.00mm vs. 16.00mm) and height (20.50mm vs. 22.50mm), which may improve PCB layout but requires verification that the reduced footprint does not conflict with adjacent components. The LF2020NP-222 maintains nearly identical dimensions to the original part, minimizing layout concerns.

Q: What certifications and compliance standards apply to these substitutes?

A: Both substitute parts are ROHS3 compliant. The B82731M2132A030 additionally carries ENEC, UR, and VDE certifications. The LF2020NP-222 REACH status is vendor-undefined. Applications requiring specific regulatory certifications should confirm compliance requirements against the substitute part documentation.

Q: Is the original ELF-18D290T still available?

A: The ELF-18D290T is classified as obsolete. While 644 pieces are listed as in-stock inventory, this represents limited remaining supply. For new designs and ongoing production, transition to an active substitute part is recommended to ensure long-term component availability.