ELF-18N012A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18N012A is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 1.2A current handling capability. This component features a typical DC resistance of 300mOhm and is housed in a vertical 4-pin package with dimensions of 18.00mm × 27.50mm.

The ELF-18N012A is classified as obsolete. Locating equivalent or substitute components is necessary to support ongoing maintenance, repair, and new design requirements where this part is specified or functionally required.

Substiute Parts

ELF-18N012A

Panasonic Electronic ComponentsIn Stock: 979ELF-18N012A Datasheet

Current PartRFQ

SS21V-100098

KEMETIn Stock: 2369SS21V-100098 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18N012A is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4-pin package
• Current Rating: Substitute must support minimum 1.2A operation
• DC Resistance: Substitute DCR must not exceed 300mOhm to maintain equivalent performance characteristics
• Physical Dimensions: Package footprint must be compatible with through-hole PCB layouts

The substitute part SS21V-100098 (KEMET) meets the core functional requirements as a 2-line common mode choke with through-hole mounting in a vertical 4-pin configuration. However, parameter variations exist that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The ELF-18N012A is obsolete, making the active SS21V-100098 a viable alternative for new designs and ongoing production support.

Compliance Consideration: The SS21V-100098 is ROHS3 compliant, whereas the ELF-18N012A is RoHS non-compliant. Applications subject to RoHS regulations must use the KEMET substitute.

Performance Trade-offs: The SS21V-100098 operates at a lower maximum current rating (1A versus 1.2A) and exhibits higher DC resistance (600mOhm versus 300mOhm). These differences must be evaluated against specific circuit requirements. The KEMET part provides specified AC voltage rating (250V) and operating temperature range (-25°C ~ 120°C), which are not documented for the Panasonic part.

Physical Compatibility: Dimensional differences exist between the two parts. The SS21V-100098 is slightly larger in length (20.50mm versus 18.00mm) but shorter in height (24.50mm versus 27.50mm) and narrower in width (16.50mm versus 27.50mm). PCB layout verification is required to confirm mechanical fit.

Frequently Asked Questions (FAQ)

Q: Can SS21V-100098 directly replace ELF-18N012A in all applications?

A: Direct replacement requires verification of three factors: (1) current requirement does not exceed 1A, (2) circuit tolerance for increased DCR (600mOhm versus 300mOhm), and (3) PCB layout accommodation of different physical dimensions.

Q: What is the impact of higher DC resistance in the substitute part?

A: Increased DCR results in higher power dissipation and voltage drop across the component. Applications operating at or near the 1.2A rating of the original part may experience performance degradation with the 1A-rated substitute.

Q: Are there compatibility concerns with the different package dimensions?

A: Yes. The SS21V-100098 has different length, width, and height specifications. PCB through-hole spacing and component clearance must be verified before substitution. Physical prototyping or simulation is recommended for space-constrained layouts.

Q: Does RoHS compliance affect substitution decisions?

A: For applications subject to RoHS regulations, the ROHS3-compliant SS21V-100098 is required. The RoHS non-compliant ELF-18N012A cannot be used in regulated markets or applications with RoHS mandates.

Q: What parameters should be prioritized when evaluating substitutes?

A: Prioritize in this order: (1) number of lines and mounting type (must match), (2) current rating (substitute must meet or exceed application requirement), (3) DC resistance (lower is preferable), (4) physical dimensions (must fit PCB layout), and (5) compliance certifications (must meet regulatory requirements).