ELC-09D821DF Equivalent & Substitute Parts

Part Overview

The ELC-09D821DF is a 820 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 300 mA with a DC resistance of 1.6Ohm. This through-hole radial component operates at a test frequency of 10 kHz and is packaged in a vertical cylinder configuration with a 0.374" diameter and 0.350" seated height.

The product is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or repair requirements for systems utilizing this inductor specification.

Substiute Parts

ELC-09D821DF

Panasonic Electronic ComponentsIn Stock: 774ELC-09D821DF Datasheet

Current PartRFQ

7447728215

Würth ElektronikIn Stock: 12577447728215 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELC-09D821DF is determined by the following critical parameters:

Primary Matching Criteria:

• Inductance value: 820 µH (exact match required)
• Mounting type: Through Hole (mechanical compatibility)
• Package configuration: Radial, Vertical Cylinder (form factor compatibility)
• Shielding classification: Unshielded (electromagnetic performance class)

Secondary Compatibility Criteria:

• Current rating: Must equal or exceed 300 mA
• DC resistance: Must not significantly exceed 1.6Ohm (affects circuit performance)
• Tolerance: ±10% or tighter acceptable
• RoHS compliance: ROHS3 Compliant (regulatory requirement)

The substitute part 7447728215 (Würth Elektronik WE-TI series) meets all primary matching criteria and exceeds secondary requirements with a 360 mA current rating and 1.56Ohm maximum DC resistance.

Parameter Comparison

Engineering Selection Recommendations

The 7447728215 (Würth Elektronik WE-TI series) is a direct functional substitute for the obsolete ELC-09D821DF. Both components are ROHS3 compliant and meet the core electrical and mechanical requirements for 820 µH through-hole radial inductor applications.

The Würth Elektronik substitute provides measurable advantages: tighter inductance tolerance (±5% versus ±10%), higher current rating (360 mA versus 300 mA), and lower maximum DC resistance (1.56Ohm versus 1.6Ohm). The substitute maintains unshielded configuration and identical mounting classification.

Physical dimensions differ slightly: the Würth part measures 0.307" diameter and 0.394" seated height compared to the Panasonic original at 0.374" diameter and 0.350" seated height. PCB layout verification is required to confirm mechanical fit within the target application.

Both components carry active inventory status and are available for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can the 7447728215 directly replace the ELC-09D821DF in existing designs?

A: The 7447728215 meets all electrical specifications and mounting requirements. However, physical dimensions differ slightly (diameter and height). PCB footprint and component clearance must be verified before implementation.

Q: What is the significance of the inductance tolerance difference (±10% versus ±5%)?

A: The substitute part offers tighter tolerance, meaning inductance values remain closer to the nominal 820 µH specification. This provides improved circuit performance consistency and reduced variation across production batches.

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

A: Both components are ROHS3 compliant. The Würth Elektronik part includes REACH Unaffected status. No regulatory barriers exist for substitution in applications requiring these certifications.

Q: Why does the current rating differ (300 mA versus 360 mA)?

A: The Würth Elektronik substitute is rated for higher current capacity. If the application operates at or below 300 mA, this higher rating provides additional design margin and thermal headroom.

Q: What does "Drum Core, Wirewound" mean compared to "Wirewound"?

A: Both are wirewound inductors. The Würth part uses a ferrite drum core structure, while the Panasonic original does not specify core material. This construction difference does not affect substitution compatibility for the specified electrical parameters.

Q: How do the test frequencies (10 kHz versus 1 kHz) affect substitution?

A: Inductance values are measured at different frequencies. Both measurements confirm the 820 µH nominal value. The frequency difference reflects manufacturer test methodology and does not impact functional equivalence.