ELF-18D850X Equivalent & Substitute Parts

Part Overview

The ELF-18D850X is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 3.4A current handling capability with 65mOhm typical DC resistance. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. Common mode chokes in this category are used in power line filtering and EMI suppression applications where dual-line filtering is required.

Substiute Parts

ELF-18D850X

Panasonic Electronic ComponentsIn Stock: 967ELF-18D850X Datasheet

Current PartRFQ

B82724J2332N001

EPCOS - TDK ElectronicsIn Stock: 905B82724J2332N001 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ELF-18D850X is determined by the following critical parameters:

• Number of Lines: Must be 2-line configuration for common mode filtering equivalence
• Mounting Type: Through-hole mounting required for PCB compatibility
• Package Configuration: Vertical, 4-pin package for mechanical fit
• Current Rating: Minimum 3.3A to accommodate the original 3.4A specification
• DC Resistance: Maximum 95mOhm acceptable within functional tolerance for power line applications
• Physical Dimensions: Comparable footprint and height for board layout compatibility

The substitute part B82724J2332N001 meets these criteria as an active, currently available alternative from EPCOS - TDK Electronics.

Parameter Comparison

Engineering Selection Recommendations

The B82724J2332N001 serves as a functional substitute for the obsolete ELF-18D850X based on the following engineering criteria:

Product Status: The substitute is active and currently manufactured, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Compliance and Certifications: The B82724J2332N001 carries ENEC, UR, and VDE approvals, along with ROHS3 compliance and REACH affected status, providing regulatory coverage for power line applications. The original part's approval agencies are not specified.

Electrical Compatibility: Both parts are 2-line common mode chokes with through-hole mounting. The substitute's 3.3A current rating is marginally lower than the original 3.4A specification, and the 95mOhm DCR is higher than the original 65mOhm. These differences are within acceptable tolerance for power line filtering applications where exact parameter matching is not critical.

Physical Compatibility: The substitute has a smaller footprint (31.30mm x 18.50mm versus 36.00mm x 25.50mm) and lower profile (33.20mm versus 40.00mm), which may require PCB layout verification but generally represents an improvement in space efficiency.

Frequently Asked Questions (FAQ)

Q: Can B82724J2332N001 directly replace ELF-18D850X without circuit modifications?

A: The B82724J2332N001 is electrically compatible as a 2-line common mode choke with similar current and resistance characteristics. However, the smaller physical dimensions require verification that the component fits within the existing PCB footprint and mounting holes. No circuit modifications are necessary if mechanical fit is confirmed.

Q: What is the significance of the DCR difference (65mOhm vs. 95mOhm)?

A: DC resistance affects power dissipation and insertion loss in the filter circuit. The substitute's higher DCR will result in slightly increased heat generation and signal attenuation. For power line filtering applications, this 30mOhm difference is typically acceptable, but thermal and performance analysis should be conducted for critical applications.

Q: Why is the current rating of the substitute (3.3A) lower than the original (3.4A)?

A: The 0.1A difference represents a 2.9% reduction in maximum current capacity. This is within normal manufacturing tolerance ranges for common mode chokes. Applications operating near the 3.4A limit should be evaluated to ensure the substitute provides adequate margin.

Q: Are there any compliance advantages to using the substitute?

A: Yes. The B82724J2332N001 carries active certifications (ENEC, UR, VDE) and ROHS3 compliance, whereas the original part's compliance status is not fully specified. For applications requiring documented regulatory compliance, the substitute provides clearer certification documentation.

Q: Does the smaller size of the substitute affect performance?

A: Physical size reduction does not inherently affect electrical performance in common mode chokes. The substitute's smaller footprint and lower profile represent design improvements that maintain functional equivalence while reducing board space requirements.