Equivalent & Substitute Parts for ELF-18D290S

Part Overview

The ELF-18D290S is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 1.1A current handling capability. This component is classified as obsolete, necessitating identification of active alternative parts that maintain functional compatibility within the allowed electrical and mechanical parameters of the product category.

Substiute Parts

ELF-18D290S

Panasonic Electronic ComponentsIn Stock: 917ELF-18D290S Datasheet

Current PartRFQ

B82731M2112A030

EPCOS - TDK ElectronicsIn Stock: 5816B82731M2112A030 Datasheet

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EV20-0.3-02-33M

Schaffner EMC Inc.In Stock: 3262EV20-0.3-02-33M Datasheet

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LF2020NP-333

Sumida America Components Inc.In Stock: 772LF2020NP-333 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D290S is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package / Case: Must be vertical, 4 PC pin
• Current Rating: Must support minimum 1.1A operation
• Physical Footprint: Length and width must accommodate 21.00mm x 16.00mm base dimensions with height considerations for PCB clearance

The three identified substitute parts meet these core mechanical and electrical criteria while offering active product status and improved compliance profiles.

Parameter Comparison

Engineering Selection Recommendations

B82731M2112A030 (EPCOS - TDK Electronics) is the primary substitute candidate. It maintains the 1.1A current rating of the original part, supports identical 2-line through-hole configuration with vertical 4-pin packaging, and provides the most direct electrical compatibility. This part is ROHS3 compliant, carries active product status, and includes third-party certifications (ENEC, UR, VDE) with specified operating temperature range (-40°C ~ 125°C) and 250V AC voltage rating.

EV20-0.3-02-33M (Schaffner EMC Inc.) and LF2020NP-333 (Sumida America Components Inc.) are secondary alternatives suitable only for applications where current requirements do not exceed 300mA. Both parts maintain the 2-line through-hole configuration and vertical 4-pin package format. EV20-0.3-02-33M provides 250V AC voltage rating specification. Both are ROHS3 compliant with active product status. These parts are not suitable for direct replacement in circuits requiring the full 1.1A current capacity of the original ELF-18D290S.

Frequently Asked Questions (FAQ)

Q: Can B82731M2112A030 be used as a direct replacement for ELF-18D290S?

A: Yes, within the allowed electrical and mechanical parameters. Both parts support 1.1A current rating, feature 2-line common mode choke configuration, through-hole mounting, and vertical 4-pin packaging. Physical dimensions are compatible (21.00mm x 15.00mm vs. 21.00mm x 16.00mm), with B82731M2112A030 offering lower height (20.50mm vs. 22.50mm). The substitute provides improved compliance status (ROHS3 vs. non-compliant) and active product availability.

Q: Why are EV20-0.3-02-33M and LF2020NP-333 listed as substitutes if they only support 300mA?

A: These parts are included as substitutes for applications where the circuit design operates at or below 300mA current levels. They maintain the required 2-line through-hole configuration and vertical 4-pin package compatibility. Selection depends on actual circuit current requirements, not the maximum rating of the original part.

Q: What are the key differences in DC resistance between substitute options?

A: ELF-18D290S specifies 277mOhm (Typ). B82731M2112A030 has 400mOhm (Typ), representing a 123mOhm increase. EV20-0.3-02-33M has 1.78Ohm (Typ), and LF2020NP-333 has 3.42Ohm. Higher DCR values result in increased power dissipation and heat generation. Circuit thermal analysis is required when selecting parts with elevated DCR specifications.

Q: Are all substitute parts RoHS compliant?

A: All three substitute parts are ROHS3 compliant. The original ELF-18D290S is RoHS non-compliant. If RoHS compliance is a design requirement, any of the three substitutes satisfy this criterion.

Q: What certifications does B82731M2112A030 carry?

A: B82731M2112A030 carries ENEC, UR, and VDE certifications. These represent European Norms (ENEC), Underwriters Laboratories (UR), and Verband der Elektrotechnik (VDE) approvals. The original ELF-18D290S does not specify approval agencies.

Q: Are there height clearance considerations when substituting?

A: Yes. B82731M2112A030 has maximum height of 20.50mm (1.5mm lower than original). EV20-0.3-02-33M has maximum height of 26.00mm (4.6mm higher than original). LF2020NP-333 matches the original at 22.50mm. PCB layout and component clearance requirements must be verified for each substitute option.