ELF-18D270D Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D270D 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, making identification of suitable substitute parts essential for ongoing production support, maintenance, and design continuity. The part features a compact vertical 4-pin configuration with 248mOhm typical DC resistance and is rated for unlimited moisture sensitivity (MSL 1).

Substiute Parts

ELF-18D270D

Panasonic Electronic ComponentsIn Stock: 1226ELF-18D270D Datasheet

Current PartRFQ

7448640397

Würth ElektronikIn Stock: 7747448640397 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18D270D is determined by the following critical parameters:

• Number of Lines: Must remain 2-line configuration for functional compatibility
• Mounting Type: Through-hole mounting required for PCB assembly compatibility
• Package Configuration: Vertical 4-pin configuration for footprint compatibility
• Current Rating: Substitute must support minimum 1.1A; higher ratings are acceptable
• DC Resistance: Substitute DCR must not significantly exceed 248mOhm to maintain circuit performance
• Physical Dimensions: Substitute footprint must accommodate existing PCB layouts

The Würth Elektronik 7448640397 qualifies as a substitute based on matching 2-line configuration, through-hole mounting, vertical 4-pin package, and superior electrical specifications (1.2A current rating, 225mOhm DCR). The substitute maintains mechanical compatibility while offering improved performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The Würth Elektronik 7448640397 is the qualified substitute for the obsolete ELF-18D270D based on the following engineering criteria:

• Functional Equivalence: Both components share identical 2-line common mode choke architecture with through-hole vertical 4-pin mounting, ensuring direct functional replacement in existing circuit designs.

• Electrical Performance: The 7448640397 exceeds the original specification with 1.2A current rating versus 1.1A, and provides lower DC resistance (225mOhm vs. 248mOhm), resulting in improved thermal performance and reduced power dissipation.

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete ELF-18D270D.

• Compliance & Certifications: The 7448640397 carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. Both components share EAR99 export classification.

• Physical Compatibility: Dimensional differences are minimal (21.20mm vs. 20.00mm length; 17.80mm vs. 20.00mm height). The substitute's reduced height provides additional PCB layout flexibility.

Frequently Asked Questions (FAQ)

Q: Can the Würth Elektronik 7448640397 directly replace the Panasonic ELF-18D270D in existing designs?

A: Yes. Both components feature identical 2-line configuration, through-hole mounting, and vertical 4-pin package. The substitute meets or exceeds all critical electrical parameters (current rating, DC resistance) required for functional equivalence.

Q: What are the key differences between these two parts?

A: The primary differences are product status (obsolete vs. active), current rating (1.1A vs. 1.2A), DC resistance (248mOhm vs. 225mOhm), and physical dimensions. The substitute offers superior electrical performance and regulatory compliance.

Q: Are there any PCB layout considerations when switching to the 7448640397?

A: The substitute has slightly larger footprint dimensions (21.20mm x 21.20mm vs. 20.00mm x 20.87mm) but reduced height (17.80mm vs. 20.00mm). Verify that the PCB layout accommodates the marginally larger length and width while benefiting from the reduced height clearance.

Q: Does the substitute meet current regulatory requirements?

A: Yes. The 7448640397 is ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory standards. The original ELF-18D270D compliance status is not specified.

Q: What is the inductance specification for the substitute?

A: The 7448640397 is specified at 2.7 mH @ 10 kHz. The original ELF-18D270D inductance value is not provided in the available documentation.

Q: Is the substitute available in the same packaging format?

A: The substitute is supplied in tube packaging, whereas the original packaging format is not specified. Both components use identical through-hole vertical 4-pin configuration for PCB assembly.