ELC-09D681DF Equivalent & Substitute Parts

Part Overview

The ELC-09D681DF is a 680 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 340 mA with 1.4Ohm DC resistance. This through-hole radial component operates at 10 kHz test frequency and is classified as obsolete. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for ongoing design support and production continuity.

Substiute Parts

ELC-09D681DF

Panasonic Electronic ComponentsIn Stock: 729ELC-09D681DF Datasheet

Current PartRFQ

744772681

Würth ElektronikIn Stock: 1300744772681 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELC-09D681DF is determined by strict equivalence across the following critical parameters:

• Inductance Value: 680 µH (±10% tolerance maintained)
• Current Rating: Minimum 340 mA; higher ratings acceptable
• DC Resistance: 1.4Ohm maximum
• Mounting Configuration: Through-hole radial, vertical cylinder orientation
• Shielding Type: Unshielded
• Compliance: ROHS3 compliant

The substitute part 744772681 (Würth Elektronik WE-TI series) meets all critical substitution criteria. It maintains identical inductance, tolerance, and DC resistance specifications while providing a higher current rating (350 mA) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 744772681 (Würth Elektronik WE-TI series) is the qualified substitute for ELC-09D681DF applications. Selection is based on:

• Electrical Equivalence: Identical inductance (680 µH), tolerance (±10%), and DC resistance (1.4Ohm) ensure direct functional replacement in circuit designs.
• Current Margin: The 350 mA rating exceeds the original 340 mA specification, providing operational headroom.
• Compliance Continuity: Both parts maintain ROHS3 compliance, ensuring regulatory consistency.
• Product Availability: The substitute is active in production, eliminating supply chain risk associated with the obsolete original part.
• Mechanical Compatibility: Through-hole radial mounting and vertical cylinder package orientation are preserved, supporting PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can 744772681 be used as a direct replacement for ELC-09D681DF?

A: Yes. The substitute maintains identical inductance (680 µH), tolerance (±10%), DC resistance (1.4Ohm), and mounting configuration. The higher current rating (350 mA vs. 340 mA) is compatible with applications designed for the original part.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete vs. active), core material (unspecified vs. ferrite drum core), and physical dimensions. The Würth part is slightly smaller in diameter (7.80mm vs. 9.50mm) but taller (10.00mm vs. 8.90mm). Both maintain electrical equivalence for the specified application parameters.

Q: Are there any compliance or certification concerns with substitution?

A: No. Both parts are ROHS3 compliant. The substitute carries REACH Unaffected status, ensuring regulatory alignment across multiple compliance frameworks.

Q: Does the physical size difference affect PCB layout?

A: The substitute has a smaller diameter but greater height. PCB footprint verification is required to confirm clearance in the vertical dimension and component spacing around the inductor location.

Q: What is the operating temperature range for the substitute?

A: The 744772681 operates across -40°C to 125°C. Verify this range meets application requirements if thermal performance is a design constraint.