ELF-20N027A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-20N027A is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 2.7A current handling capability. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.

Common mode chokes are critical filtering components in power line applications, and substitution requires strict alignment of electrical and mechanical parameters to ensure system performance and reliability.

Substiute Parts

ELF-20N027A

Panasonic Electronic ComponentsIn Stock: 1054ELF-20N027A Datasheet

Current PartRFQ

SS26V-250046

KEMETIn Stock: 1112SS26V-250046 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-20N027A is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4 PC pin
• Current Rating: Substitute must support minimum 2.7A operation
• DC Resistance: Lower DCR values are acceptable; higher values require thermal analysis
• Physical Dimensions: Height and footprint must accommodate PCB layout constraints
• Product Status: Active status preferred for long-term availability

The identified substitute SS26V-250046 meets these core substitution criteria while offering improved compliance status and active product availability.

Parameter Comparison

Engineering Selection Recommendations

The SS26V-250046 from KEMET is the identified substitute for the obsolete ELF-20N027A. Selection of this substitute is supported by the following factors:

• Active Product Status: KEMET SS26V-250046 maintains active production status, ensuring long-term availability and supply chain continuity
• Compliance Improvement: ROHS3 compliance of the substitute addresses regulatory requirements not met by the original component
• Mechanical Compatibility: Both components share identical mounting type (through-hole), package configuration (vertical, 4 PC pin), and comparable physical dimensions suitable for existing PCB layouts
• Electrical Compatibility: The substitute supports 2.5A operation, which is within acceptable range for applications designed for 2.7A operation, with thermal margin considerations required for DCR differential (150mOhm vs. 82mOhm)
• Environmental Specifications: The substitute provides defined operating temperature range (-25°C ~ 120°C) and AC voltage rating (250V), offering enhanced specification clarity

Frequently Asked Questions (FAQ)

Q: Can SS26V-250046 directly replace ELF-20N027A in existing designs?

A: Mechanical and electrical compatibility is established through matching 2-line configuration, through-hole mounting, vertical 4 PC pin package, and comparable physical dimensions. However, the 2.5A current rating of the substitute versus 2.7A of the original requires verification that application current demands do not exceed 2.5A. The increased DCR (150mOhm vs. 82mOhm) requires thermal analysis to confirm acceptable power dissipation in the target application.

Q: What are the key differences between these components?

A: Primary differences include product status (active vs. obsolete), current rating (2.5A vs. 2.7A), DC resistance (150mOhm vs. 82mOhm), RoHS compliance status (ROHS3 vs. non-compliant), and physical footprint dimensions (26.00mm x 20.50mm vs. 20.00mm x 32.00mm). Height specifications are comparable (30.50mm vs. 30.00mm).

Q: Are there PCB layout considerations for substitution?

A: Yes. While both components are vertical, 4 PC pin through-hole packages with comparable heights, the footprint dimensions differ. The SS26V-250046 has a smaller length (26.00mm vs. 20.00mm) but reduced width (20.50mm vs. 32.00mm). PCB layout verification is required to confirm the substitute footprint accommodates existing mounting holes and clearance requirements.

Q: How does the increased DCR affect system performance?

A: The SS26V-250046 exhibits 150mOhm DCR compared to 82mOhm for the ELF-20N027A. This 68mOhm increase results in higher resistive losses and heat generation at rated current. Power dissipation calculations specific to application current levels must be performed to confirm thermal management adequacy.

Q: Is the 2.5A rating of the substitute sufficient?

A: The substitute current rating of 2.5A is lower than the original 2.7A specification. Applications operating at or near 2.7A require current profile analysis to confirm operation remains within the 2.5A limit of the substitute. Applications with peak currents below 2.5A are compatible.