ELF-18D850W Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D850W is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 2.5A current handling capability. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates with a typical DC resistance of 124mOhm and is packaged in a vertical 4-pin configuration.

Substiute Parts

ELF-18D850W

Panasonic Electronic ComponentsIn Stock: 1085ELF-18D850W Datasheet

Current PartRFQ

B82734R2262B030

EPCOS - TDK ElectronicsIn Stock: 2310B82734R2262B030 Datasheet

SimilarRFQ

EV35-3.0-02-10M

Schaffner EMC Inc.In Stock: 1409EV35-3.0-02-10M Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ELF-18D850W are identified based on the following critical parameters that define functional equivalence:

• Number of Lines: Must be 2-line configuration
• Mounting Type: Must be through-hole
• Package Configuration: Must be vertical, 4-pin
• Current Rating: Must meet or exceed 2.5A requirement
• DC Resistance: Should be comparable to 124mOhm typical value
• Physical Dimensions: Should accommodate existing PCB footprints

Two active substitute parts meet these criteria: the B82734R2262B030 from EPCOS - TDK Electronics and the EV35-3.0-02-10M from Schaffner EMC Inc. Both components maintain the 2-line through-hole configuration with vertical 4-pin packaging and support current ratings at or above the original specification.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products with current availability, addressing the obsolescence status of the ELF-18D850W. Selection between the two substitutes depends on specific application requirements:

B82734R2262B030 offers the closest current rating match at 2.6A with comparable DCR of 130mOhm. This part carries ROHS3 compliance and holds approvals from ENEC, UR, and VDE. The component features a wider operating temperature range (-40°C to 125°C) and is rated for 250V AC operation. Physical dimensions are slightly smaller, which may require PCB layout verification.

EV35-3.0-02-10M provides the highest current capacity at 3A with the lowest DC resistance at 72mOhm, offering improved thermal performance. This part is ROHS3 compliant and rated for 250V AC operation. Physical dimensions closely match the original part in length (1.417"), though height extends to 1.681". Operating temperature range is -25°C to 100°C.

Both substitutes eliminate RoHS non-compliance issues present in the original part and provide active product status with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can the B82734R2262B030 be used as a direct replacement for the ELF-18D850W?

A: The B82734R2262B030 meets the core functional requirements: 2-line configuration, through-hole mounting, vertical 4-pin package, and current rating of 2.6A exceeding the 2.5A requirement. However, physical dimensions are smaller (32.50mm x 21.00mm vs. 36.00mm x 25.50mm), requiring verification that the PCB footprint accommodates this change. Height is also reduced from 40.00mm to 31.00mm.

Q: What are the key differences between the two substitute parts?

A: The primary differences are current capacity (B82734R2262B030 at 2.6A vs. EV35-3.0-02-10M at 3A), DC resistance (130mOhm vs. 72mOhm), and physical dimensions. The EV35-3.0-02-10M maintains closer dimensional alignment with the original part in length and offers superior thermal characteristics through lower resistance.

Q: Are both substitute parts RoHS compliant?

A: Yes, both B82734R2262B030 and EV35-3.0-02-10M are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete ELF-18D850W.

Q: What is the impact of different DC resistance values on circuit performance?

A: DC resistance affects power dissipation and voltage drop across the component. The EV35-3.0-02-10M at 72mOhm provides lower dissipation compared to the original 124mOhm and the B82734R2262B030 at 130mOhm. Selection should be based on thermal budget and voltage drop tolerance in the specific application.

Q: Do the substitute parts have the same pin configuration?

A: Yes, both substitute parts maintain the vertical 4-pin configuration required for through-hole mounting, ensuring compatibility with existing pin layouts.

Q: What certifications do the substitute parts carry?

A: The B82734R2262B030 holds ENEC, UR, and VDE approvals. The EV35-3.0-02-10M does not list specific approval agencies in the provided data. Application requirements should determine if specific certifications are mandatory.