ELF-18D290H Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D290H is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 300mA 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 a DC resistance of 2.691Ohm (Typ) and is rated for 300mA maximum current.

Substiute Parts

ELF-18D290H

Panasonic Electronic ComponentsIn Stock: 844ELF-18D290H Datasheet

Current PartRFQ

EV20-0.3-02-33M

Schaffner EMC Inc.In Stock: 3262EV20-0.3-02-33M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18D290H is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Current Rating: Must support minimum 300mA
• Mounting Type: Must be through-hole compatible
• Package Configuration: Must maintain vertical 4-pin layout
• Physical Footprint: Dimensional compatibility within PCB layout constraints
• DC Resistance: Should remain within acceptable operating parameters for the application

The EV20-0.3-02-33M from Schaffner EMC Inc. qualifies as a substitute based on matching these core electrical and mechanical specifications while maintaining form-factor compatibility.

Parameter Comparison

Engineering Selection Recommendations

The EV20-0.3-02-33M represents an active substitute for the obsolete ELF-18D290H. Both components share identical electrical ratings for current handling (300mA) and maintain compatible through-hole mounting configurations with matching footprint dimensions (21.00mm x 16.00mm).

The Schaffner component offers improved DC resistance characteristics (1.78Ohm vs. 2.691Ohm), which reduces power dissipation in the application. The EV20-0.3-02-33M includes specified AC voltage rating (250V) and operating temperature range (-25°C ~ 100°C), providing additional design margin documentation. The height differential (1.024" vs. 0.886") requires PCB layout verification to ensure clearance compatibility.

Selection of the EV20-0.3-02-33M is supported by its active product status and RoHS3 compliance, ensuring long-term availability and regulatory alignment for new designs.

Frequently Asked Questions (FAQ)

Q: Can the EV20-0.3-02-33M directly replace the ELF-18D290H in existing designs?

A: Direct replacement is possible from an electrical standpoint, as both components maintain 2-line configuration, 300mA current rating, and compatible through-hole mounting. PCB layout verification is required to confirm the 0.138" (4.60mm) height difference does not create clearance conflicts.

Q: What is the significance of the DC resistance difference between these parts?

A: The EV20-0.3-02-33M exhibits lower DC resistance (1.78Ohm vs. 2.691Ohm), resulting in reduced power dissipation and heat generation during operation. This represents an improvement over the original specification.

Q: Why is the ELF-18D290H classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Panasonic Electronic Components. The EV20-0.3-02-33M provides an active alternative with equivalent functional specifications.

Q: Are there compliance differences between these components?

A: The EV20-0.3-02-33M is RoHS3 compliant and REACH unaffected, providing documented regulatory compliance. The original ELF-18D290H compliance documentation is not specified in available data.

Q: What physical constraints should be considered during substitution?

A: Both components maintain identical footprint dimensions (21.00mm x 16.00mm). The height difference of 4.60mm requires verification against PCB clearance requirements, particularly in applications with space constraints or adjacent components.