ELF-19N005A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-19N005A is a 2-line common mode choke manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 500mA current handling capability. This component features a typical DC resistance of 1.68Ohm and is part of the N series product line. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

ELF-19N005A

Panasonic Electronic ComponentsIn Stock: 847ELF-19N005A Datasheet

Current PartRFQ

SS21V-R040770

KEMETIn Stock: 1231SS21V-R040770 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-19N005A is evaluated based on the following critical parameters that define functional equivalence for common mode choke applications:

Primary Substitution Criteria:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4-pin package
• Current Rating: Substitute must support minimum 500mA operation
• DC Resistance: Substitute DCR must not exceed application thermal and loss requirements

The SS21V-R040770 from KEMET meets the core mechanical and electrical substitution requirements as a 2-line, through-hole common mode choke with vertical 4-pin configuration. However, the substitute exhibits different electrical characteristics including reduced maximum current rating (400mA versus 500mA) and higher DC resistance (5.4Ohm versus 1.68Ohm), which must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The SS21V-R040770 represents an active product alternative to the obsolete ELF-19N005A, offering continued supply availability and ROHS3 compliance. Selection of this substitute requires evaluation of the following factors:

Current Derating: The substitute part supports a maximum current rating of 400mA compared to the original 500mA specification. Applications operating at or near 500mA with the original part require confirmation that operation within the 400mA limit of the substitute is acceptable.

DC Resistance Impact: The substitute exhibits significantly higher DC resistance (5.4Ohm versus 1.68Ohm typical). This increase directly affects power dissipation and thermal performance. Applications sensitive to insertion loss or thermal budget must account for this 3.2x increase in resistance.

Physical Footprint: The substitute features a smaller footprint (0.807" L x 0.650" W versus 0.709" L x 1.083" W) with reduced height (0.965" versus 1.083"). PCB layout compatibility must be verified, though the reduced height may provide design flexibility.

Compliance Status: The KEMET substitute is ROHS3 compliant and carries active product status, ensuring long-term availability and regulatory alignment for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the SS21V-R040770 directly replace the ELF-19N005A in all applications?

A: Direct replacement requires verification of two critical parameters. First, confirm that the application current requirement does not exceed 400mA, as the substitute is rated 100mA lower than the original. Second, evaluate whether the increased DC resistance (5.4Ohm versus 1.68Ohm) is acceptable for your thermal and loss budget. If either parameter exceeds the substitute's capability, alternative parts must be sourced.

Q: What is the impact of the higher DC resistance on my circuit?

A: Higher DC resistance increases power dissipation according to P = I²R. At 400mA, the substitute dissipates approximately 0.864W compared to 0.268W for the original part at the same current. This 3.2x increase in dissipation must be accommodated through thermal design or current derating.

Q: Are the physical dimensions compatible with my PCB layout?

A: Both parts use vertical 4-pin through-hole packages with identical pin configurations. The substitute is physically smaller (0.807" L x 0.650" W x 0.965" H versus 0.709" L x 1.083" W x 1.083" H). Verify that your PCB footprint accommodates the substitute's dimensions, particularly the reduced width and height, which may require layout adjustment.

Q: What compliance certifications apply to the substitute?

A: The SS21V-R040770 is ROHS3 compliant and REACH unaffected. The original ELF-19N005A compliance status is not specified in available documentation. For applications requiring specific regulatory certifications, confirm that the substitute meets all applicable requirements.

Q: Is the substitute available in the same packaging format?

A: Both parts are supplied in vertical 4-pin through-hole packages. The KEMET substitute is available in bulk packaging, while the original Panasonic part was available in standard packaging. Confirm packaging and minimum order quantities with your supplier.