ELF-19N012A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-19N012A is a 2-line common mode choke manufactured by Panasonic Electronic Components, rated for 1.2A maximum current with 300mOhm typical DC resistance. This through-hole component is designed for power line filtering applications in electronic equipment. The part is currently obsolete, making identification of functionally equivalent substitutes necessary for ongoing design support, legacy system maintenance, and component procurement.

Substiute Parts

ELF-19N012A

Panasonic Electronic ComponentsIn Stock: 1166ELF-19N012A Datasheet

Current PartRFQ

744862120

Würth ElektronikIn Stock: 837744862120 Datasheet

SimilarRFQ

SS21V-R100146

KEMETIn Stock: 1276SS21V-R100146 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ELF-19N012A are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Number of Lines: 2 (mandatory)
• Mounting Type: Through Hole (mandatory)
• Package Configuration: Vertical, 4 PC Pin (mandatory)
• Current Rating: Minimum 1.0A to 1.2A range
• DC Resistance: Within acceptable operating range (300mOhm to 2Ohm)

Secondary Considerations:

• Filter Type: Power Line applications
• Physical dimensions compatible with PCB layout constraints
• Product Status: Active status preferred for long-term availability

The identified substitutes meet the core electrical and mechanical requirements while offering improved availability and modern compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

744862120 (Würth Elektronik WE-TFC Series)

This substitute is active and ROHS3 compliant. The 400mA current rating is lower than the original 1.2A specification. Selection of this part requires confirmation that application current demands do not exceed 400mA. The reduced DC resistance of 2Ohm compared to the original 300mOhm may affect circuit performance in applications sensitive to impedance characteristics. Compact dimensions (17.00mm height) provide PCB layout advantages in space-constrained designs.

SS21V-R100146 (KEMET SS Series)

This substitute is active and ROHS3 compliant. The 1A current rating closely approaches the original 1.2A specification, making it suitable for applications operating near the upper current range. The 600mOhm DC resistance is approximately double the original specification and must be evaluated against circuit requirements. Operating temperature range (-25°C ~ 120°C) is narrower than the Würth alternative. Physical dimensions (20.50mm x 24.50mm) are comparable to the original part, supporting direct PCB layout compatibility.

Both substitutes provide modern compliance certifications and active product status, ensuring long-term component availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the 744862120 substitute for the ELF-19N012A in all applications?

A: The 744862120 matches the core mechanical requirements (2-line, through-hole, vertical 4-pin configuration) but has a maximum current rating of 400mA versus the original 1.2A. Substitution is valid only for applications where circuit current does not exceed 400mA.

Q: What is the impact of different DC resistance values between the original and substitute parts?

A: The ELF-19N012A has 300mOhm typical DCR, while the 744862120 has 2Ohm and the SS21V-R100146 has 600mOhm. Higher DC resistance increases power dissipation and voltage drop across the component. Circuit analysis is required to determine if the increased resistance is acceptable for the intended application.

Q: Are the substitute parts physically compatible with the original PCB layout?

A: All three parts use vertical, 4-pin through-hole packaging. The 744862120 is more compact (17.00mm height) than the original (27.50mm), allowing direct substitution with potential PCB layout optimization. The SS21V-R100146 (24.50mm height) is also compatible with minimal layout adjustment.

Q: What compliance advantages do the substitute parts offer?

A: Both the 744862120 and SS21V-R100146 are ROHS3 compliant, whereas the original ELF-19N012A is RoHS non-compliant. Modern designs requiring RoHS compliance must use one of the active substitute parts.

Q: Which substitute part is recommended for new designs?

A: Selection depends on application current requirements. For applications requiring 1A or higher current capacity, the SS21V-R100146 is preferred. For applications with lower current demands (under 400mA), the 744862120 offers compact dimensions and higher voltage rating (400V AC).