ELF-18D620 Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D620 is a 100 mH, 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications with a maximum current rating of 400mA. This part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity. The component operates across a temperature range of -20°C to 105°C and carries a 250V AC voltage rating.

Substiute Parts

ELF-18D620

Panasonic Electronic ComponentsIn Stock: 772ELF-18D620 Datasheet

Current PartRFQ

B82732F2451B001

EPCOS - TDK ElectronicsIn Stock: 8693B82732F2451B001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELF-18D620 is determined by the following critical parameters:

• Inductance Value: 100 mH nominal inductance
• Number of Lines: 2-line configuration for common mode filtering
• Current Rating: Minimum 400mA to meet or exceed the original specification
• DC Resistance: Comparable DCR to maintain circuit performance
• Voltage Rating: Minimum 250V AC rating
• Mounting Type: Through-hole configuration for PCB compatibility
• Operating Temperature Range: Support for the application environment

The B82732F2451B001 qualifies as a substitute based on matching inductance value, line configuration, voltage rating, and mounting type, with current rating and temperature range exceeding the original part specifications.

Parameter Comparison

Engineering Selection Recommendations

The B82732F2451B001 serves as an active substitute for the obsolete ELF-18D620. Key selection factors include:

• Product Status: The substitute is classified as active, ensuring continued availability and manufacturing support, whereas the main part is obsolete.
• Compliance: The B82732F2451B001 is ROHS3 compliant and carries REACH unaffected status, meeting modern regulatory requirements. The ELF-18D620 is RoHS non-compliant.
• Certifications: The substitute holds ENEC, UR, and VDE approvals, providing third-party validation for safety and performance standards.
• Performance Headroom: The substitute exceeds the original part in current rating (450mA vs. 400mA) and operating temperature range (-40°C to 125°C vs. -20°C to 105°C).
• Physical Orientation: The substitute uses horizontal mounting versus vertical mounting in the original part; PCB layout accommodation is required.

Frequently Asked Questions (FAQ)

Q: Can the B82732F2451B001 directly replace the ELF-18D620 without circuit modifications?

A: The substitute meets the core electrical specifications (100 mH inductance, 2-line configuration, 250V AC rating, 400mA+ current capacity). However, the physical orientation differs (horizontal vs. vertical mounting), requiring PCB layout adjustment. DC resistance is slightly higher (2.93Ohm vs. 2.448Ohm), which may introduce minimal additional losses in the circuit.

Q: What is the significance of the inductance measurement frequency difference (1 kHz vs. 10 kHz)?

A: Both parts are specified at their respective measurement frequencies. The 100 mH inductance value is the critical parameter for common mode filtering function. Frequency-dependent inductance variation is inherent to choke design; the specified values at different frequencies reflect manufacturer characterization methods and do not preclude substitution.

Q: Are there any compliance or regulatory advantages to using the substitute?

A: Yes. The B82732F2451B001 is ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations. The original ELF-18D620 is RoHS non-compliant, which may restrict use in regulated markets or applications with strict material composition requirements.

Q: How does the higher DC resistance of the substitute affect circuit performance?

A: The DCR difference (2.93Ohm vs. 2.448Ohm) represents approximately 20% higher resistance. This results in increased power dissipation and heat generation under full current load. Circuit thermal analysis should confirm acceptable operating conditions at the maximum current rating of 400mA.

Q: What packaging considerations apply to this substitution?

A: The main part is supplied in standard packaging, while the substitute is supplied in trays. Both use 4-pin through-hole configurations. The horizontal versus vertical orientation requires verification of available PCB space and routing clearances before implementation.