ELF-18D656X Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D656X is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 2.2A current handling capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The part features a compact vertical 4-pin configuration with 111mOhm typical DC resistance, suitable for power line filtering and EMI suppression in electronic equipment.

Substiute Parts

ELF-18D656X

Panasonic Electronic ComponentsIn Stock: 832ELF-18D656X Datasheet

Current PartRFQ

B82734R2232B030

EPCOS - TDK ElectronicsIn Stock: 2058B82734R2232B030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D656X is determined by the following critical parameters:

Primary Compatibility Criteria:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4-pin package
• Current Rating: Must meet or exceed 2.2A
• DC Resistance: Should be comparable (111mOhm baseline)

Secondary Compatibility Factors:

• Physical dimensions must accommodate existing PCB layouts
• Electrical performance at specified frequency ranges
• Regulatory compliance and certifications

The B82734R2232B030 from EPCOS - TDK Electronics meets all primary compatibility criteria with a 2.3A current rating (exceeding the 2.2A requirement) and identical 2-line through-hole vertical 4-pin configuration. While the DC resistance is higher at 185mOhm typical, the part provides additional specifications including defined inductance (15 mH @ 10 kHz) and operating temperature range (-40°C ~ 125°C), making it suitable for direct substitution in applications where these enhanced specifications are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The B82734R2232B030 is the qualified substitute for the ELF-18D656X based on the following engineering factors:

Product Status Alignment: The substitute part is active and currently manufactured by EPCOS - TDK Electronics, ensuring long-term availability and supply chain continuity compared to the obsolete ELF-18D656X.

Regulatory Compliance: The B82734R2232B030 carries certifications from ENEC, UR, and VDE, with ROHS3 compliance and REACH affected status documentation. These certifications support deployment in regulated applications and markets requiring environmental compliance.

Electrical Performance: The substitute exceeds the current rating requirement (2.3A vs. 2.2A) and provides specified operating temperature range (-40°C ~ 125°C) and AC voltage rating (250V), enabling use in broader application environments than the original part specification allows.

Physical Compatibility: While the substitute is 4.6mm longer (32.50mm vs. 29.00mm), it is 3.6mm shorter in height (31.00mm vs. 34.60mm). PCB layout verification is required to confirm dimensional accommodation in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the B82734R2232B030 directly replace the ELF-18D656X without circuit modifications?

A: The B82734R2232B030 maintains the same 2-line through-hole vertical 4-pin configuration and exceeds the current rating requirement. However, the higher DC resistance (185mOhm vs. 111mOhm) and different inductance specification (15 mH @ 10 kHz) may affect circuit performance. Circuit analysis is required to confirm functional equivalence in your specific application.

Q: What are the dimensional differences, and will the substitute fit existing PCB layouts?

A: The substitute is 4.6mm longer (32.50mm vs. 29.00mm) and 3.6mm shorter in height (31.00mm vs. 34.60mm). PCB layout verification is necessary to confirm that the increased length does not conflict with adjacent components or routing constraints.

Q: Why is the DC resistance higher in the substitute part?

A: The B82734R2232B030 is specified with defined inductance (15 mH @ 10 kHz) and broader operating temperature range, which may contribute to the higher DC resistance value. The substitute's electrical characteristics are optimized for power line filtering applications with enhanced performance specifications.

Q: Are there compliance or certification differences between the parts?

A: The ELF-18D656X specifications do not include regulatory certifications or compliance documentation. The B82734R2232B030 carries ENEC, UR, and VDE approvals with ROHS3 compliance, making it suitable for regulated markets and applications requiring documented compliance.

Q: What is the current availability status of each part?

A: The ELF-18D656X is obsolete with limited remaining inventory (786 pcs). The B82734R2232B030 is active and currently manufactured with substantial inventory availability (2000 pcs), ensuring reliable supply for new designs and ongoing support.