ELF-18D216 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D216 is a 3.9 mH Common Mode Choke (CMC) manufactured by Panasonic Electronic Components, designed for two-line power line filtering applications. This through-hole component is rated for 1A maximum current with a typical DC resistance of 294 mOhm and operates across a temperature range of -20°C to 105°C.

The ELF-18D216 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

ELF-18D216

Panasonic Electronic ComponentsIn Stock: 893ELF-18D216 Datasheet

Current PartRFQ

EH20-1.0-02-3M9

Schaffner EMC Inc.In Stock: 1067EH20-1.0-02-3M9 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D216 is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Inductance Value: 3.9 mH nominal inductance
• Current Rating: 1A maximum current capacity
• Mounting Type: Through-hole configuration
• Voltage Rating: 250V AC minimum
• Package Configuration: 4-pin through-hole package

The substitute part EH20-1.0-02-3M9 (Schaffner EMC Inc.) meets these core electrical and mechanical requirements. While measured at different frequencies (10 kHz vs. 1 kHz) and with variations in DCR and physical dimensions, the part maintains functional equivalence within the specified parameter constraints.

Parameter Comparison

Engineering Selection Recommendations

The EH20-1.0-02-3M9 is the qualified substitute for the obsolete ELF-18D216. Selection should be based on the following factors:

Product Status: The EH20-1.0-02-3M9 maintains active product status with ongoing manufacturer support, whereas the ELF-18D216 is obsolete and subject to supply discontinuation.

Compliance: The EH20-1.0-02-3M9 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The ELF-18D216 is RoHS non-compliant and does not satisfy modern environmental standards.

Electrical Performance: Both parts maintain identical 1A current ratings and 250V AC voltage ratings. The EH20-1.0-02-3M9 exhibits lower DC resistance (168 mOhm vs. 294 mOhm), resulting in reduced power dissipation and improved thermal performance.

Physical Compatibility: Both components utilize through-hole mounting with 4-pin configurations. Dimensional variations exist; verification of PCB layout compatibility is required prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the EH20-1.0-02-3M9 directly replace the ELF-18D216 without circuit modification?

A: The EH20-1.0-02-3M9 meets the core electrical specifications (2-line, 3.9 mH, 1A, 250V AC). Physical dimensions differ slightly; PCB footprint and mounting hole spacing must be verified for direct substitution. No circuit modification is required if mechanical compatibility is confirmed.

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

A: Inductance values are frequency-dependent. The ELF-18D216 is specified at 1 kHz, while the EH20-1.0-02-3M9 is specified at 10 kHz. Both parts maintain the same 3.9 mH nominal inductance value at their respective measurement frequencies, ensuring functional equivalence in typical power line filtering applications.

Q: Does the lower DC resistance of the EH20-1.0-02-3M9 affect circuit performance?

A: The EH20-1.0-02-3M9 exhibits 168 mOhm DCR compared to 294 mOhm for the ELF-18D216. Lower resistance reduces power dissipation and heat generation, which is a performance improvement. This change does not negatively impact circuit function and may enhance thermal characteristics.

Q: Are there packaging differences between these parts?

A: The ELF-18D216 is packaged vertically in a 4-pin configuration, while the EH20-1.0-02-3M9 is packaged horizontally. Both are through-hole components. Physical dimensions vary (20.00mm x 21.00mm vs. 21.00mm x 21.00mm for length and width). PCB layout compatibility must be confirmed before substitution.

Q: What is the operating temperature range difference?

A: The ELF-18D216 operates from -20°C to 105°C, while the EH20-1.0-02-3M9 operates from -25°C to 100°C. The EH20-1.0-02-3M9 provides lower temperature capability (-25°C vs. -20°C) but slightly reduced upper temperature limit (100°C vs. 105°C). Application temperature requirements must be evaluated for compatibility.