ELF-18D218 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D218 is a 22 mH common mode choke manufactured by Panasonic Electronic Components, designed for two-line filtering applications in power distribution circuits. This through-hole component is rated for 400mA maximum current with a typical DC resistance of 1.564Ohm and operates across a temperature range of -20°C to 105°C. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations where legacy specifications must be maintained.

Substiute Parts

ELF-18D218

Panasonic Electronic ComponentsIn Stock: 790ELF-18D218 Datasheet

Current PartRFQ

LF2020NP-223

Sumida America Components Inc.In Stock: 1171LF2020NP-223 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D218 is determined by strict alignment of the following critical parameters:

• Inductance value: 22 mH @ 1 kHz (exact match required)
• Number of lines: 2-line configuration (exact match required)
• Current rating: 400mA maximum (equal or greater acceptable)
• Mounting type: Through hole (exact match required)
• Package configuration: Vertical, 4 PC pin (exact match required)
• DC resistance: Functionally equivalent within typical operating margins

The LF2020NP-223 manufactured by Sumida America Components Inc. meets all substitution criteria. Both components share identical inductance specifications, line configuration, current ratings, mounting methodology, and physical package format. Variations in DC resistance (2.04Ohm vs. 1.564Ohm) remain within acceptable operational parameters for common mode choke applications.

Parameter Comparison

Engineering Selection Recommendations

The LF2020NP-223 is the qualified substitute for the obsolete ELF-18D218. Selection of this alternative is supported by:

• Active product status ensuring continued availability and manufacturing support
• ROHS3 compliance, providing regulatory advantage over the non-compliant original part
• Identical electrical specifications for inductance, current capacity, and line configuration
• Matching through-hole mounting and vertical 4-pin package format, enabling direct PCB compatibility
• Equivalent moisture sensitivity rating ensuring consistent handling and storage requirements

The LF2020NP-223 is suitable for direct replacement in applications where the ELF-18D218 specifications are required and component availability is a constraint.

Frequently Asked Questions (FAQ)

Q: Can the LF2020NP-223 be used as a direct replacement for the ELF-18D218 in existing designs?

A: Yes. Both components share identical inductance (22 mH @ 1 kHz), current rating (400mA), line configuration (2-line), mounting type (through hole), and package format (vertical, 4 PC pin). The LF2020NP-223 is electrically and mechanically compatible for direct PCB substitution.

Q: What is the difference in DC resistance between these two parts?

A: The ELF-18D218 has a typical DC resistance of 1.564Ohm, while the LF2020NP-223 measures 2.04Ohm. This 0.476Ohm difference is functionally acceptable for common mode choke applications and does not compromise filtering performance at the specified 400mA current rating.

Q: Are there physical dimension differences between the ELF-18D218 and LF2020NP-223?

A: Minor dimensional variations exist. The ELF-18D218 measures 0.787" L x 0.827" W x 0.787" H (20.00mm x 21.00mm x 20.00mm), while the LF2020NP-223 measures 0.827" L x 0.638" W x 0.886" H (21.00mm x 16.20mm x 22.50mm). Both maintain vertical, 4-pin through-hole configuration and fit standard PCB layouts designed for this package type.

Q: What is the advantage of selecting the LF2020NP-223 over the original ELF-18D218?

A: The LF2020NP-223 is an active product with ongoing manufacturing support, whereas the ELF-18D218 is obsolete. Additionally, the LF2020NP-223 is ROHS3 compliant, providing regulatory compliance benefits for new designs and systems subject to environmental standards.

Q: Are moisture sensitivity requirements the same for both parts?

A: Yes. Both the ELF-18D218 and LF2020NP-223 carry an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage, handling, or assembly processes.