ELF-21N024A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-21N024A is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 2.4A 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 typical DC resistance of 94mOhm and is housed in a vertical 4-pin package with dimensions of 20.00mm × 32.00mm × 30.00mm (max height).

Substiute Parts

ELF-21N024A

Panasonic Electronic ComponentsIn Stock: 1018ELF-21N024A Datasheet

Current PartRFQ

SS26V-R250061

KEMETIn Stock: 986SS26V-R250061 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-21N024A 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 package format
• Current Rating: Substitute must support minimum 2.4A operation
• DC Resistance: Substitute DCR must not significantly exceed the original 94mOhm specification to maintain thermal and efficiency characteristics
• Physical Dimensions: Substitute footprint must accommodate the original mounting hole pattern and spatial constraints

The identified substitute part SS26V-R250061 (KEMET) meets these core substitution criteria while offering enhanced specifications including active product status and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The SS26V-R250061 (KEMET) serves as the primary substitute for the obsolete ELF-21N024A. Selection of this substitute is supported by the following engineering factors:

Product Status: The ELF-21N024A is classified as obsolete, necessitating transition to an active product. The SS26V-R250061 maintains active product status, ensuring long-term availability and manufacturing support.

Compliance & Certifications: The SS26V-R250061 is RoHS3 compliant, addressing regulatory requirements that the original non-compliant ELF-21N024A does not meet. This compliance status is critical for applications subject to environmental and safety regulations.

Functional Compatibility: Both components maintain 2-line configuration, through-hole mounting, and vertical 4-pin package format. The SS26V-R250061 provides a current rating of 2.5A, exceeding the original 2.4A requirement, and includes specified AC voltage rating (250V) and operating temperature range (-25°C ~ 120°C).

Physical Considerations: While the SS26V-R250061 exhibits slightly different planar dimensions (26.00mm L × 20.50mm W versus 20.00mm L × 32.00mm W), both components maintain compatible height specifications (30.50mm max versus 30.00mm max). PCB layout verification is required to confirm footprint compatibility with existing hole patterns.

DC Resistance Trade-off: The SS26V-R250061 exhibits higher DC resistance (150mOhm versus 94mOhm typical). This parameter difference must be evaluated against thermal dissipation and efficiency requirements in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SS26V-R250061 directly replace the ELF-21N024A without PCB modification?

A: Both components share identical line count (2), mounting type (through-hole), and package configuration (vertical 4-pin). However, planar dimensions differ (26.00mm × 20.50mm versus 20.00mm × 32.00mm). PCB hole pattern verification is required before confirming direct replacement feasibility.

Q: What is the impact of the increased DC resistance in the SS26V-R250061?

A: The SS26V-R250061 exhibits 150mOhm DC resistance compared to the ELF-21N024A's 94mOhm typical value. This 60mOhm increase results in higher resistive losses and thermal dissipation. Applications with strict thermal budgets or high-frequency current operation require thermal analysis to confirm acceptability.

Q: Does the SS26V-R250061 meet current regulatory requirements?

A: Yes. The SS26V-R250061 is RoHS3 compliant, whereas the ELF-21N024A is RoHS non-compliant. This compliance status addresses environmental and safety regulations applicable to most modern applications.

Q: What is the current rating relationship between these components?

A: The SS26V-R250061 provides 2.5A maximum current rating, exceeding the ELF-21N024A's 2.4A specification. This margin provides operational headroom for the substitute part.

Q: Are there temperature operating range considerations?

A: The SS26V-R250061 specifies an operating temperature range of -25°C ~ 120°C. The ELF-21N024A does not provide temperature specifications. Applications requiring operation outside this range require alternative evaluation.

Q: What packaging formats are available for the SS26V-R250061?

A: The SS26V-R250061 is supplied in bulk packaging. Verify packaging requirements for your procurement and assembly processes.