ELF-18D850Z Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-18D850Z is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications requiring 1.5A 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 features a typical DC resistance of 274mOhm and vertical 4-pin configuration, commonly used in power line filtering applications.

Substiute Parts

ELF-18D850Z

Panasonic Electronic ComponentsIn Stock: 1064ELF-18D850Z Datasheet

Current PartRFQ

B82734R2172B030

EPCOS - TDK ElectronicsIn Stock: 9215B82734R2172B030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-18D850Z is determined by the following critical parameters that must be maintained or exceeded:

Core Electrical Parameters:

• Number of Lines: 2 (fixed requirement)
• Current Rating: Minimum 1.5A (substitute must equal or exceed)
• DC Resistance: Comparable performance (substitute at 320mOhm is acceptable within engineering tolerance)
• Mounting Type: Through Hole (fixed requirement)
• Package Configuration: Vertical, 4 PC Pin (fixed requirement)

Physical Compatibility:

• Footprint dimensions must accommodate the original PCB layout
• Height constraints must be verified for clearance in the application

The B82734R2172B030 from EPCOS - TDK Electronics qualifies as a substitute based on matching core electrical and mechanical specifications while providing enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The B82734R2172B030 is the qualified substitute for the ELF-18D850Z based on the following engineering criteria:

Electrical Compatibility: The substitute exceeds the current rating requirement (1.7A vs. 1.5A) and maintains comparable DC resistance performance. The specified inductance value of 27 mH at 10 kHz and 250V AC voltage rating provide defined performance characteristics absent from the original part specification.

Regulatory & Compliance Status: The substitute holds active product status with ROHS3 compliance and international certifications (ENEC, UR, VDE), addressing regulatory requirements that the obsolete original part cannot support. The original part's RoHS non-compliance status necessitates transition to compliant alternatives for new designs and ongoing production.

Physical Considerations: The substitute features a smaller footprint (32.50mm x 21.00mm vs. 36.00mm x 25.50mm) and reduced height (31.00mm vs. 40.00mm). PCB layout verification is required to confirm that the reduced dimensions do not create clearance conflicts in the target application.

Packaging: The substitute is supplied in Tray packaging versus the original specification. Packaging format should be confirmed against procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the B82734R2172B030 directly replace the ELF-18D850Z without PCB modifications?

A: The substitute maintains the same mounting type (through hole) and package configuration (vertical, 4 PC pin). However, the reduced physical dimensions (smaller footprint and height) require PCB layout verification. If the original PCB design includes mechanical constraints or clearance requirements based on the larger original dimensions, layout adjustments may be necessary.

Q: What is the significance of the higher current rating on the substitute part?

A: The B82734R2172B030 is rated for 1.7A maximum current versus the original 1.5A rating. This higher rating provides additional design margin and does not create compatibility issues. The substitute remains suitable for applications designed for the original 1.5A specification.

Q: How does the DC resistance difference affect circuit performance?

A: The substitute exhibits 320mOhm typical DC resistance compared to the original 274mOhm. This 46mOhm increase represents approximately 17% higher resistance. For applications where DC resistance is a critical parameter, circuit performance impact should be evaluated against the specific application requirements.

Q: Why is RoHS compliance important for this substitution?

A: The original ELF-18D850Z is RoHS non-compliant, while the B82734R2172B030 is ROHS3 compliant. Regulatory requirements in many markets mandate RoHS compliance for new component selections. The substitute addresses this requirement while maintaining functional equivalence.

Q: Are there any temperature operating range considerations?

A: The substitute specifies an operating temperature range of -40°C to 125°C. The original part does not provide temperature specifications. If the application operates within this range, the substitute is suitable. Applications requiring extended temperature operation should confirm compatibility with the specified range.

Q: What certifications does the substitute carry?

A: The B82734R2172B030 holds ENEC, UR, and VDE certifications, providing international safety and performance validation. The original part does not specify approval agencies. These certifications support compliance requirements in regulated applications.