ELF-18N032A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18N032A is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 3.2A current handling capability with 45mOhm typical DC resistance. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

ELF-18N032A

Panasonic Electronic ComponentsIn Stock: 732ELF-18N032A Datasheet

Current PartRFQ

SS21V-250015

KEMETIn Stock: 1166SS21V-250015 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18N032A is determined by the following critical parameters:

• Number of Lines: Must remain 2-line configuration for common mode filtering function
• Mounting Type: Through-hole mounting required for PCB compatibility
• Package Configuration: Vertical, 4-pin package for mechanical fit
• Current Rating: Substitute must support minimum 3.2A operation
• DC Resistance: Substitute DCR must not exceed application thermal and loss requirements
• Pin Configuration: 4 PC pin vertical orientation for direct board-level replacement

The SS21V-250015 from KEMET meets these substitution criteria as a 2-line through-hole common mode choke with vertical 4-pin configuration and current rating of 2.5A, though with higher DC resistance of 100mOhm.

Parameter Comparison

Engineering Selection Recommendations

The SS21V-250015 represents an active product alternative to the obsolete ELF-18N032A. Key considerations for selection:

Product Status: The ELF-18N032A is obsolete; the SS21V-250015 is active and currently manufactured, ensuring long-term availability and supply chain continuity.

Compliance: The SS21V-250015 is ROHS3 compliant, whereas the ELF-18N032A is RoHS non-compliant. Applications requiring RoHS compliance must use the KEMET substitute.

Current Rating Differential: The SS21V-250015 has a maximum current rating of 2.5A compared to the ELF-18N032A's 3.2A. Applications operating at currents exceeding 2.5A require thermal and design verification.

DC Resistance: The SS21V-250015 exhibits 100mOhm DCR versus the ELF-18N032A's 45mOhm typical DCR. Higher resistance results in increased power dissipation; thermal analysis is necessary for high-current applications.

Physical Dimensions: The SS21V-250015 is slightly larger in length and width but shorter in height. PCB layout verification is required to confirm mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can the SS21V-250015 directly replace the ELF-18N032A in all applications?

A: Direct replacement requires verification of three factors: (1) current operating point must not exceed 2.5A, (2) thermal dissipation from the higher 100mOhm DCR must be acceptable, and (3) PCB layout must accommodate the different physical dimensions.

Q: What is the impact of the higher DC resistance in the SS21V-250015?

A: Higher DCR increases resistive losses proportional to I²R. At 2.5A, the SS21V-250015 dissipates approximately 625mW compared to approximately 360mW for the ELF-18N032A at 3.2A. Thermal design must account for this increased dissipation.

Q: Are there mechanical compatibility concerns between these parts?

A: Both components use vertical 4-pin through-hole packages. The SS21V-250015 has different footprint dimensions (20.50mm x 16.50mm versus 18.00mm x 27.50mm). PCB hole spacing and layout must be verified for compatibility.

Q: Does the RoHS compliance difference affect substitution decisions?

A: RoHS compliance is a regulatory requirement for many applications and markets. If the original design requires RoHS non-compliant components, the SS21V-250015 cannot be used. If RoHS compliance is required, the SS21V-250015 is the appropriate choice.

Q: What is the inductance specification for the ELF-18N032A?

A: Inductance is not provided in the available technical parameters for the ELF-18N032A. The SS21V-250015 specifies 1.5 mH @ 1 kHz. Inductance matching should be verified against original design specifications.