ELF-21V030A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-21V030A is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 3A current handling capability. This component features a typical DC resistance of 58mOhm and is housed in a vertical 4-pin package with dimensions of 29.00mm × 21.00mm × 35.50mm.

The ELF-21V030A is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

ELF-21V030A

Panasonic Electronic ComponentsIn Stock: 1114ELF-21V030A Datasheet

Current PartRFQ

744823422

Würth ElektronikIn Stock: 3243744823422 Datasheet

SimilarRFQ

B82734R2322B030

EPCOS - TDK ElectronicsIn Stock: 1333B82734R2322B030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ELF-21V030A are identified based on the following critical parameters that determine functional compatibility:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4-pin package
• Current Rating: Must meet or exceed 3A requirement
• DC Resistance: Must be compatible with circuit design specifications
• Physical Dimensions: Must fit within or accommodate existing PCB layout constraints

The two substitute parts listed below satisfy these core substitution criteria while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

744823422 (Würth Elektronik WE-CMB Series)

This substitute offers active product status with ROHS3 compliance. The 4A current rating provides margin above the 3A requirement. The 30mOhm DCR is lower than the original specification, which reduces power dissipation in the application. Physical dimensions are smaller (24.60mm × 13.00mm × 25.50mm), which may require PCB layout verification for fit. AC voltage rating of 250V and operating temperature range of -40°C to 125°C are specified.

B82734R2322B030 (EPCOS - TDK Electronics B82734 Series)

This substitute offers active product status with ROHS3 compliance and additional approval certifications (ENEC, UR, VDE). The 3.2A current rating closely matches the original 3A specification. The 85mOhm DCR is higher than the original specification and should be evaluated for circuit performance impact. Physical dimensions (32.50mm × 21.00mm × 31.00mm) are comparable to the original part, with width matching exactly at 21.00mm. AC voltage rating of 250V and operating temperature range of -40°C to 125°C are specified.

Frequently Asked Questions (FAQ)

Q: Can the 744823422 be used as a direct replacement for the ELF-21V030A?

A: The 744823422 meets the core substitution criteria of 2-line configuration, through-hole mounting, and vertical 4-pin package. However, its smaller physical dimensions (24.60mm × 13.00mm) require verification against PCB layout constraints. The lower DCR (30mOhm vs. 58mOhm) and higher current rating (4A vs. 3A) are advantageous for most applications.

Q: What are the implications of the higher DCR in the B82734R2322B030?

A: The B82734R2322B030 has a DCR of 85mOhm compared to the original 58mOhm. This 47% increase in DC resistance will result in higher power dissipation and heat generation at the same current levels. Circuit thermal analysis should be performed to ensure this is acceptable for the application.

Q: Are both substitute parts RoHS compliant?

A: Yes, both substitute parts are ROHS3 compliant. The B82734R2322B030 additionally carries REACH Affected status, while the 744823422 is REACH Unaffected.

Q: Do the substitute parts have specified operating temperature ranges?

A: Yes, both substitute parts are rated for -40°C to 125°C operating temperature. The original ELF-21V030A does not have a specified operating temperature range in the provided data.

Q: Which substitute part has the closest physical dimensions to the original?

A: The B82734R2322B030 has dimensions of 32.50mm × 21.00mm × 31.00mm, which most closely matches the original ELF-21V030A at 29.00mm × 21.00mm × 35.50mm. The width dimension is identical at 21.00mm. The 744823422 is significantly smaller at 24.60mm × 13.00mm × 25.50mm.

Q: What certifications does the B82734R2322B030 carry?

A: The B82734R2322B030 carries ENEC, UR, and VDE approval certifications in addition to ROHS3 compliance, providing broader regulatory acceptance across different markets and applications.