ELF-18D417F Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D417F is an 18 mH common mode choke manufactured by Panasonic Electronic Components, designed for two-line power line filtering applications. This component features an 800 mA current rating and operates across a temperature range of -20°C to 105°C. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

ELF-18D417F

Panasonic Electronic ComponentsIn Stock: 1141ELF-18D417F Datasheet

Current PartRFQ

EH24-0.8-02-18M

Schaffner EMC Inc.In Stock: 977EH24-0.8-02-18M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D417F is determined by the following critical parameters:

• Inductance Value: 18 mH nominal inductance
• Number of Lines: 2-line configuration for common mode filtering
• Current Rating: 800 mA maximum continuous current
• Voltage Rating: 250 V AC minimum
• Mounting Type: Through Hole configuration
• Package Pin Configuration: 4-pin package

The substitute part EH24-0.8-02-18M meets these core electrical and mechanical requirements. While measured at different frequencies (400 Hz vs. 1 kHz), both components deliver the specified 18 mH inductance value required for the application. The substitute exhibits lower DC resistance (438 mOhm vs. 655 mOhm), which represents an improvement in thermal performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The EH24-0.8-02-18M from Schaffner EMC Inc. is a qualified substitute for the obsolete ELF-18D417F. Selection should be based on the following factors:

Product Status: The EH24-0.8-02-18M maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete ELF-18D417F.

Regulatory Compliance: The EH24-0.8-02-18M is ROHS3 compliant, meeting current environmental regulations. The original ELF-18D417F is RoHS non-compliant, which may present restrictions in certain markets and applications.

Thermal Performance: The EH24-0.8-02-18M exhibits superior DC resistance characteristics (438 mOhm vs. 655 mOhm), resulting in lower power dissipation and improved thermal efficiency under rated current conditions.

Physical Configuration: The substitute features a horizontal pin orientation compared to the vertical orientation of the original part. PCB layout modifications may be required to accommodate this dimensional difference.

Temperature Range: The EH24-0.8-02-18M operates across -25°C to 100°C, which covers the lower temperature extreme of the original specification but has a slightly reduced upper temperature limit (100°C vs. 105°C).

Frequently Asked Questions (FAQ)

Q: Can the EH24-0.8-02-18M directly replace the ELF-18D417F without circuit modifications?

A: The EH24-0.8-02-18M meets all critical electrical specifications (18 mH inductance, 800 mA current rating, 250 V AC voltage rating, 2-line configuration). However, the horizontal pin orientation differs from the vertical orientation of the original part, requiring PCB layout adjustment.

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

A: Both components are specified to deliver 18 mH inductance at their respective measurement frequencies. Inductance values in common mode chokes vary with frequency due to core material characteristics. The 18 mH nominal value is the critical parameter for functional equivalence.

Q: Does the lower DC resistance of the EH24-0.8-02-18M affect circuit performance?

A: The lower DC resistance (438 mOhm vs. 655 mOhm) represents an improvement. It reduces resistive losses and heat generation at the 800 mA rated current, resulting in better thermal performance without affecting the filtering characteristics of the circuit.

Q: Are there compliance considerations when switching from the ELF-18D417F to the EH24-0.8-02-18M?

A: Yes. The EH24-0.8-02-18M is ROHS3 compliant, while the ELF-18D417F is RoHS non-compliant. This substitution aligns designs with current environmental regulations and may be required for market access in regions with RoHS enforcement.

Q: What is the impact of the 5°C difference in maximum operating temperature?

A: The EH24-0.8-02-18M is rated to 100°C maximum, compared to 105°C for the original part. For applications operating near the upper temperature limit, thermal margin analysis is required to confirm suitability.

Q: How does the packaging difference (Vertical vs. Horizontal) affect board design?

A: The pin orientation change requires PCB footprint modification. The horizontal configuration of the EH24-0.8-02-18M may offer improved space utilization in certain board layouts, but existing designs must be re-evaluated for physical fit and thermal management.