ELF-18D219 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D219 is a 2.7 mH common mode choke manufactured by Panasonic Electronic Components, designed for two-line filtering applications in through-hole configurations. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity. The part operates within a temperature range of -20°C to 105°C and is rated for 250V AC applications with a maximum current capacity of 1.3A.

Substiute Parts

ELF-18D219

Panasonic Electronic ComponentsIn Stock: 896ELF-18D219 Datasheet

Current PartRFQ

7448640397

Würth ElektronikIn Stock: 7747448640397 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D219 is determined by the following critical parameters:

• Inductance Value: 2.7 mH nominal inductance
• Number of Lines: 2-line configuration for common mode filtering
• Current Rating: Minimum 1.2A to accommodate the original 1.3A specification
• DC Resistance: Acceptable range up to 225mOhm to maintain circuit performance
• Voltage Rating: 250V AC minimum
• Mounting Type: Through hole configuration with vertical 4-pin package orientation
• Physical Footprint: Compatible dimensions within PCB layout constraints

The Würth Elektronik part 7448640397 meets these substitution criteria while maintaining functional equivalence for two-line common mode choke applications.

Parameter Comparison

Engineering Selection Recommendations

The ELF-18D219 is obsolete, requiring transition to an active equivalent. The Würth Elektronik 7448640397 is the identified substitute based on matching inductance value, line configuration, and through-hole package type.

Compatibility Considerations:

The 7448640397 operates at a wider temperature range (-40°C to 125°C versus -20°C to 105°C), providing enhanced thermal performance. The current rating of 1.2A is 0.1A lower than the original 1.3A specification; this difference is acceptable for applications operating below 1.2A continuous current. The DC resistance increases from 197mOhm to 225mOhm, representing a 14% increase that may affect circuit impedance characteristics in sensitive applications.

Physical dimensions show minor variations: the substitute is marginally larger in length and width (21.20mm versus 20.00mm and 21.00mm) but shorter in height (17.80mm versus 20.00mm). PCB layout verification is required to confirm fit within existing mounting footprints.

The substitute part carries ROHS3 compliance and REACH unaffected status, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 7448640397 directly replace the ELF-18D219 in all applications?

A: The 7448640397 is functionally equivalent for two-line common mode choke applications operating at or below 1.2A. Applications requiring the full 1.3A current capacity must be evaluated individually. PCB layout must accommodate the slightly larger footprint dimensions.

Q: What is the significance of the different inductance measurement frequencies (1 kHz vs. 10 kHz)?

A: Both parts specify 2.7 mH nominal inductance but at different measurement frequencies. The inductance value remains consistent across the frequency range relevant to common mode filtering applications. The measurement frequency difference does not affect substitution eligibility.

Q: Are there compliance or certification differences between these parts?

A: The ELF-18D219 compliance status is not specified in available documentation. The 7448640397 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: How does the 28mOhm increase in DC resistance affect circuit performance?

A: The increase from 197mOhm to 225mOhm represents a 14% rise in DC resistance. For applications with tight impedance budgets or high current paths, this difference may require circuit analysis. Most common mode filtering applications tolerate this variation without performance degradation.

Q: What mounting considerations apply to the substitute part?

A: Both parts use vertical, 4-pin through-hole packages. The substitute is 2.99mm taller in length and width but 2.2mm shorter in height. Verify PCB layout clearances and mounting hole spacing before implementation.