ELF-16M050A Common Mode Choke Equivalent & Substitute Parts

Part Overview

The ELF-16M050A is a 2-line common mode choke (CMC) manufactured by Panasonic Electronic Components, designed for through-hole mounting applications with a 500mA current rating. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity. The part's core function—filtering common mode noise in two-line configurations—remains consistent across suitable substitute components, provided electrical and mechanical parameters align within acceptable tolerances.

Substiute Parts

ELF-16M050A

Panasonic Electronic ComponentsIn Stock: 947ELF-16M050A Datasheet

Current PartRFQ

B82731M2501A030

EPCOS - TDK ElectronicsIn Stock: 9887B82731M2501A030 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELF-16M050A is determined by the following critical parameters:

Mandatory Matching Criteria:

• Number of Lines: 2 (common mode choke configuration)
• Current Rating (Max): 500mA (electrical load capacity)
• Mounting Type: Through Hole (assembly compatibility)
• Package / Case: Vertical, 4 PC Pin (physical and electrical interface)

Compatible Variation Parameters:

• DC Resistance (DCR): Tolerance range acceptable within typical circuit design margins
• Physical Dimensions: Height must not exceed 0.807" (20.50mm); length and width variations acceptable if footprint fits PCB layout
• Voltage Rating: AC or DC ratings may differ if application requirements are met

The B82731M2501A030 from EPCOS - TDK Electronics satisfies all mandatory matching criteria and is therefore classified as a direct functional equivalent for the ELF-16M050A.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: B82731M2501A030

The B82731M2501A030 is the designated equivalent for the obsolete ELF-16M050A based on the following factors:

• Functional Equivalence: Identical 2-line common mode choke configuration, 500mA current rating, through-hole mounting, and 4-pin vertical package.
• Product Status: Active production status ensures long-term availability and supply chain stability, addressing the obsolescence of the original part.
• Compliance: ROHS3 compliant and REACH affected, meeting current regulatory requirements for new designs and manufacturing environments.
• Certifications: ENEC, UR, and VDE approvals provide third-party validation for safety and performance standards.

Design Considerations:

1. DC Resistance Variance: The B82731M2501A030 exhibits 2Ohm typical DCR compared to 980mOhm for the ELF-16M050A. Circuit designers must verify that the increased DCR does not exceed acceptable power dissipation or voltage drop limits in the application.

2. Physical Footprint: The B82731M2501A030 measures 0.827" L x 0.591" W (21.00mm x 15.00mm), compared to 0.591" L x 0.709" W (15.00mm x 18.00mm) for the ELF-16M050A. PCB layout verification is required to confirm adequate clearance and component placement compatibility.

3. Electrical Specifications: The B82731M2501A030 provides specified AC voltage rating (250V) and operating temperature range (-40°C ~ 125°C), which were not documented for the original part. These specifications should be cross-referenced with application requirements.

Frequently Asked Questions (FAQ)

Q: Can the B82731M2501A030 be used as a direct pin-for-pin replacement for the ELF-16M050A?

A: Yes, the B82731M2501A030 maintains identical pin configuration (vertical, 4 PC pin) and mounting type (through-hole), enabling direct electrical connection. However, physical footprint differences require PCB layout verification before implementation.

Q: What is the significance of the higher DC Resistance (2Ohm vs. 980mOhm) in the B82731M2501A030?

A: Higher DCR results in increased power dissipation and voltage drop across the component. Circuit designers must calculate whether this variance remains within acceptable operating parameters for the specific application. If DCR sensitivity is critical, alternative substitutes with lower resistance values should be evaluated.

Q: Are there any compliance or regulatory differences between the two parts?

A: Yes. The ELF-16M050A is RoHS non-compliant, while the B82731M2501A030 is ROHS3 compliant. For new designs or manufacturing environments subject to RoHS regulations, the B82731M2501A030 is the appropriate choice. The B82731M2501A030 also carries ENEC, UR, and VDE certifications, providing additional safety validation.

Q: What should I verify before finalizing the substitution?

A: Confirm the following: (1) DC Resistance variance does not exceed circuit tolerance; (2) PCB layout accommodates the 0.827" L x 0.591" W footprint; (3) Operating temperature range (-40°C ~ 125°C) meets application requirements; (4) AC voltage rating (250V) is sufficient for the intended use.

Q: Is the B82731M2501A030 available in the same packaging format?

A: The B82731M2501A030 is supplied in Tray packaging, whereas the original part number does not specify packaging format. Verify packaging requirements for your procurement and assembly processes.