ELF-16M040A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-16M040A is a 2-line common mode choke (CMC) designed for through-hole mounting with a 400mA current rating and 1.8Ohm typical DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The through-hole configuration and specific electrical characteristics define the scope for equivalent component selection.

Substiute Parts

ELF-16M040A

Panasonic Electronic ComponentsIn Stock: 785ELF-16M040A Datasheet

Current PartRFQ

B82731M2401A033

EPCOS - TDK ElectronicsIn Stock: 12559B82731M2401A033 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ELF-16M040A are identified based on the following critical parameters that must align for functional equivalence:

• Number of Lines: 2-line configuration required
• Current Rating: 400mA maximum rating
• Mounting Type: Through-hole only
• Package Configuration: Vertical, 4-pin package
• Physical Footprint: Compatible dimensions to fit existing PCB layouts

The B82731M2401A033 qualifies as a substitute based on matching these core electrical and mechanical specifications. While secondary parameters such as inductance value, DC resistance tolerance, and voltage rating may differ, the primary functional requirements for common mode filtering at 400mA through-hole mounting are satisfied.

Parameter Comparison

Engineering Selection Recommendations

The B82731M2401A033 is the identified substitute for the obsolete ELF-16M040A based on matching core specifications: 2-line configuration, 400mA current rating, through-hole mounting, and vertical 4-pin package.

Key considerations for selection:

• Product Status: The B82731M2401A033 is active and currently in production, ensuring long-term availability and supply chain stability compared to the obsolete ELF-16M040A.
• Compliance: The substitute part is ROHS3 compliant and carries international certifications (ENEC, UR, VDE), whereas the original part is RoHS non-compliant.
• Physical Compatibility: Dimensional differences exist (21.00mm x 15.00mm vs. 15.00mm x 18.00mm footprint). PCB layout verification is required to confirm fit within existing mounting holes and clearance constraints.
• Electrical Differences: DC resistance is higher (3Ohm vs. 1.8Ohm typical), which may affect thermal performance and filtering characteristics in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the B82731M2401A033 be used as a direct drop-in replacement for the ELF-16M040A?

A: The B82731M2401A033 matches the critical functional parameters (2-line, 400mA, through-hole, 4-pin vertical package) but has different physical dimensions. PCB layout compatibility must be confirmed before substitution. The higher DC resistance (3Ohm vs. 1.8Ohm) may impact thermal and filtering performance.

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

A: The primary differences are: DC resistance (1.8Ohm vs. 3Ohm), footprint dimensions (15.00mm x 18.00mm vs. 21.00mm x 15.00mm), product status (obsolete vs. active), and compliance certifications. The B82731M2401A033 includes specified voltage rating (250V AC) and operating temperature range (-40°C to 125°C), which are not provided for the original part.

Q: Is the substitute part RoHS compliant?

A: Yes, the B82731M2401A033 is ROHS3 compliant, whereas the ELF-16M040A is RoHS non-compliant. This is a significant advantage for new designs and regulatory compliance.

Q: Will the higher DC resistance of the substitute affect my circuit?

A: The B82731M2401A033 has 1.2Ohm higher DC resistance (3Ohm vs. 1.8Ohm typical). This increases power dissipation and may affect filtering performance. Circuit analysis is required to determine if this difference is acceptable for your specific application.

Q: Are there any packaging differences?

A: Both parts use vertical 4-pin through-hole packages, but the footprint dimensions differ. The substitute is slightly larger (21.00mm x 15.00mm vs. 15.00mm x 18.00mm). Verify that your PCB layout accommodates the larger footprint before implementation.