ELF-18D290C Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D290C is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications with a 400mA current rating and 1.707Ohm typical DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

ELF-18D290C

Panasonic Electronic ComponentsIn Stock: 669ELF-18D290C Datasheet

Current PartRFQ

B82731M2401A033

EPCOS - TDK ElectronicsIn Stock: 12559B82731M2401A033 Datasheet

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LF2020NP-223

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

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the ELF-18D290C is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Current Rating: Must support minimum 400mA
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4 PC pin
• Physical Dimensions: Length and width must be compatible with 21.00mm x 16.00mm footprint; height variance acceptable within board layout constraints
• DC Resistance: Must be within acceptable range for the application (1.707Ohm to 3Ohm typical)

The substitute parts listed below meet these core electrical and mechanical requirements and are available as active products from their respective manufacturers.

Parameter Comparison

Engineering Selection Recommendations

B82731M2401A033 (EPCOS - TDK Electronics): This substitute is an active product with ROHS3 compliance, VDE, ENEC, and UR approvals. It maintains the 400mA current rating and 2-line configuration with identical footprint length (21.00mm). The DC resistance of 3Ohm is higher than the original part; this must be evaluated against circuit requirements. Operating temperature range (-40°C to 125°C) and 250V AC voltage rating are specified. Packaging is provided in trays.

LF2020NP-223 (Sumida America Components Inc.): This substitute is an active product with ROHS3 compliance. It maintains the 400mA current rating, 2-line configuration, and identical physical dimensions (21.00mm x 16.20mm length and width, 22.50mm height). The DC resistance of 2.04Ohm is closest to the original specification. Moisture sensitivity level matches the original part (MSL 1). Packaging is provided in bulk.

Frequently Asked Questions (FAQ)

Q: Can the B82731M2401A033 be used as a direct replacement for the ELF-18D290C?

A: The B82731M2401A033 meets the core electrical and mechanical requirements: 2-line configuration, 400mA current rating, through-hole mounting, and vertical 4 PC pin package. However, the DC resistance is 3Ohm compared to 1.707Ohm in the original part. Circuit performance must be evaluated to determine if this higher resistance is acceptable for the application.

Q: Which substitute has the closest electrical match to the ELF-18D290C?

A: The LF2020NP-223 has a DC resistance of 2.04Ohm, which is closer to the original 1.707Ohm specification than the B82731M2401A033 at 3Ohm.

Q: Are there physical dimension differences that affect PCB layout?

A: The B82731M2401A033 has a width of 15.00mm compared to 16.00mm in the original part, a 1mm reduction. The LF2020NP-223 has a width of 16.20mm, a 0.20mm increase. Both maintain the 21.00mm length. Height differences are 20.50mm (B82731M2401A033) versus 22.50mm (original and LF2020NP-223). These variations must be verified against PCB layout constraints.

Q: What compliance certifications are available for these substitutes?

A: The B82731M2401A033 carries VDE, ENEC, and UR approvals with ROHS3 compliance. The LF2020NP-223 carries ROHS3 compliance. Both are ECCN EAR99 classified.

Q: What is the difference in packaging between the substitutes?

A: The B82731M2401A033 is supplied in trays. The LF2020NP-223 is supplied in bulk. Packaging selection depends on procurement and handling requirements.