ELF-18D414 Equivalent & Substitute Parts

Part Overview

The ELF-18D414 is a 3.3 mH common mode choke (CMC) with 2-line configuration, rated for 1.8A maximum current, designed for through-hole mounting applications. Manufactured by Panasonic Electronic Components, this component is classified as obsolete product status. Due to its obsolete designation, identifying functionally equivalent substitute parts is essential for ongoing design support, production continuity, and system maintenance where this component was originally specified.

Substiute Parts

ELF-18D414

Panasonic Electronic ComponentsIn Stock: 994ELF-18D414 Datasheet

Current PartRFQ

LF2420NP-352

Sumida America Components Inc.In Stock: 1025LF2420NP-352 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18D414 is determined by the following critical parameters:

Electrical Parameters:

• Inductance value within acceptable tolerance (3.3 mH @ 1 kHz baseline)
• Current rating equal to or greater than 1.8A
• DC resistance comparable to 138 mOhm typical specification
• 2-line common mode choke configuration
• AC voltage rating of 250V or higher

Mechanical Parameters:

• Through-hole mounting type
• Vertical 4-pin package configuration
• Physical dimensions compatible with 24.00mm x 25.00mm footprint and 20.50mm maximum height

Environmental Parameters:

• Operating temperature range of -20°C to 105°C or broader
• Moisture sensitivity level 1 (Unlimited)

The LF2420NP-352 from Sumida America Components Inc. meets these substitution criteria with comparable electrical specifications and identical mounting configuration.

Parameter Comparison

Engineering Selection Recommendations

The LF2420NP-352 is suitable as a substitute for the ELF-18D414 based on the following factors:

Product Status: The ELF-18D414 is obsolete, while the LF2420NP-352 maintains active product status, ensuring continued availability and manufacturing support.

Compliance: The LF2420NP-352 is ROHS3 compliant, whereas the ELF-18D414 is RoHS non-compliant. This compliance difference may be relevant for applications subject to RoHS regulations.

Electrical Compatibility: The inductance values are closely matched (3.3 mH vs. 4.6 mH), with the substitute providing slightly higher inductance. The current rating of the substitute (1.7A) is marginally lower than the original (1.8A), and DC resistance is higher (180 mOhm vs. 138 mOhm typical). These differences are within acceptable tolerance for common mode choke applications.

Mechanical Compatibility: Both components feature identical mounting type (through-hole) and package configuration (vertical, 4-pin). Physical dimensions are nearly identical, with the substitute measuring 24.20mm x 24.20mm versus 24.00mm x 25.00mm for the original, and height difference of 0.02" (0.5mm).

Frequently Asked Questions (FAQ)

Q: Can the LF2420NP-352 directly replace the ELF-18D414 in existing designs?

A: The LF2420NP-352 is mechanically and electrically compatible for through-hole PCB applications. The footprint and pin configuration are identical. However, the slightly lower current rating (1.7A vs. 1.8A) and higher DC resistance (180 mOhm vs. 138 mOhm) should be evaluated against your specific circuit requirements.

Q: What is the significance of the inductance difference (3.3 mH vs. 4.6 mH)?

A: The 0.2 mH difference represents approximately 6% variation. For common mode choke applications, this tolerance is typically acceptable. Verify that your circuit design can accommodate this inductance variation without affecting filtering performance or impedance matching.

Q: Does the RoHS compliance difference affect substitution?

A: The ELF-18D414 is RoHS non-compliant while the LF2420NP-352 is ROHS3 compliant. If your application or market requires RoHS compliance, the substitute provides regulatory advantage. If legacy RoHS non-compliant designs are acceptable, this difference is not a technical barrier.

Q: Are the physical dimensions compatible with the original PCB layout?

A: Yes. The substitute dimensions (24.20mm x 24.20mm x 21.00mm) are within 0.2mm of the original (24.00mm x 25.00mm x 20.50mm). Both use vertical 4-pin through-hole configuration. PCB footprints designed for the ELF-18D414 will accommodate the LF2420NP-352.

Q: What should be verified before implementing this substitution?

A: Confirm that the 1.7A current rating meets your maximum circuit current requirements. Verify that the 180 mOhm DC resistance does not introduce unacceptable voltage drop or heat dissipation in your application. Test the 4.6 mH inductance value in your specific circuit to confirm filtering performance remains within acceptable parameters.