ELF-18D417 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D417 is an 18 mH common mode choke manufactured by Panasonic Electronic Components, designed for two-line power line filtering applications. This through-hole component operates at 700mA maximum current with a typical DC resistance of 700mOhm and is rated for 250V AC operation across an operating temperature range of -20°C to 105°C.

The ELF-18D417 carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

ELF-18D417

Panasonic Electronic ComponentsIn Stock: 1128ELF-18D417 Datasheet

Current PartRFQ

EH20-0.5-02-18M

Schaffner EMC Inc.In Stock: 1201EH20-0.5-02-18M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D417 is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration for common mode filtering compatibility
• Inductance Value: 18 mH nominal inductance to maintain filtering performance
• Current Rating: Minimum 500mA to support the original 700mA specification with operational margin
• Voltage Rating - AC: Minimum 250V to match or exceed the original rating
• Mounting Type: Through Hole configuration for PCB compatibility
• Pin Configuration: 4 PC Pin package for electrical and mechanical fit

The EH20-0.5-02-18M from Schaffner EMC Inc. meets these substitution criteria. While the substitute part operates at a lower maximum current rating (500mA versus 700mA) and measures inductance at 400 Hz rather than 1 kHz, it maintains the same 18 mH inductance value, 250V AC voltage rating, and through-hole mounting configuration required for functional equivalence in applications operating below the 500mA threshold.

Parameter Comparison

Engineering Selection Recommendations

The EH20-0.5-02-18M qualifies as a functional substitute for the ELF-18D417 based on the following engineering criteria:

Product Status: The substitute part carries an Active product status, ensuring ongoing availability and supply chain support compared to the obsolete ELF-18D417.

Compliance: The EH20-0.5-02-18M is ROHS3 compliant, meeting current environmental and regulatory requirements. The original ELF-18D417 is RoHS non-compliant, making the substitute preferable for new designs or systems requiring regulatory compliance.

Electrical Compatibility: Both parts maintain identical 18 mH inductance values and 250V AC voltage ratings. The substitute's 500mA current rating is suitable for applications where the circuit current does not exceed this threshold.

Mechanical Fit: Both components feature through-hole mounting with 4 PC pin configurations. The substitute uses a horizontal package orientation compared to the vertical orientation of the original part; PCB layout must accommodate this dimensional difference.

Frequently Asked Questions (FAQ)

Q: Can the EH20-0.5-02-18M directly replace the ELF-18D417 in all applications?

A: The EH20-0.5-02-18M is suitable for applications where the circuit current remains at or below 500mA. If the original design requires the full 700mA current rating of the ELF-18D417, the substitute part is not appropriate. Additionally, the horizontal package orientation of the substitute differs from the vertical orientation of the original; verify PCB layout compatibility before substitution.

Q: What is the significance of the different inductance measurement frequencies (1 kHz versus 400 Hz)?

A: Both parts maintain 18 mH inductance at their respective measurement frequencies. The inductance value remains functionally equivalent for common mode filtering applications. The measurement frequency difference reflects manufacturer test standards and does not affect substitution eligibility.

Q: Does the substitute part's higher DC resistance (725mOhm versus 700mOhm) affect performance?

A: The DC resistance difference of 25mOhm is negligible for most power line filtering applications. Both values fall within typical manufacturing tolerances for common mode chokes in this category.

Q: Is the substitute part's narrower operating temperature range (-25°C to 100°C versus -20°C to 105°C) a concern?

A: The substitute part's operating temperature range is slightly narrower at the upper limit (100°C versus 105°C). Verify that the application's maximum operating temperature does not exceed 100°C before selecting this substitute.

Q: What packaging differences exist between these parts?

A: The ELF-18D417 ships in vertical, 4 PC pin configuration, while the EH20-0.5-02-18M uses horizontal, 4 PC pin configuration. Both are through-hole components; however, the physical orientation and footprint dimensions differ. Confirm PCB layout and mounting space accommodate the horizontal package before substitution.