ELC-3FN220M Equivalent & Substitute Parts

Part Overview

The ELC-3FN220M is a 22 µH unshielded surface mount inductor manufactured by Panasonic Electronic Components, rated for 330 mA with a DC resistance of 1.18Ohm. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain the same inductance value, tolerance, and current handling capability while meeting modern compliance standards.

Key Parameters

Parameter	Value	Specification Basis
Inductance	22 µH	Core functional requirement
Inductance Tolerance	±20%	Acceptable variation range
Current Rating	330 mA	Minimum continuous current capability
DC Resistance (DCR)	1.18Ohm	Power dissipation and thermal performance
Shielding	Unshielded	Electromagnetic interference profile
Mounting Type	Surface Mount	PCB assembly compatibility
Package Type	Nonstandard	Physical footprint constraint
Frequency - Test	100 kHz	Inductance measurement standard

Substitute Part Grouping Explanation

Substitution eligibility for the ELC-3FN220M is determined by the following criteria:

Primary Matching Parameters:

Inductance value: 22 µH (exact match required)
Inductance tolerance: ±20% (must be equal or tighter)
Current rating: minimum 330 mA (equal or higher acceptable)
Shielding configuration: Unshielded (must match)
Mounting type: Surface Mount (must match)
Inductance test frequency: 100 kHz (standard measurement condition)

Secondary Compatibility Factors:

DC resistance must not exceed the original specification to prevent excessive thermal dissipation
Physical dimensions and height must be compatible with existing PCB layouts
RoHS and environmental compliance status

The substitute part 7447732122 (Würth Elektronik WE-PD2 series) meets all primary matching parameters with enhanced electrical performance characteristics.

Parameter Comparison

Parameter	ELC-3FN220M (Panasonic)	7447732122 (Würth Elektronik)	Compatibility Assessment
Inductance	22 µH	22 µH	Exact match
Inductance Tolerance	±20%	±20%	Equivalent
Current Rating (Amps)	330 mA	530 mA	Substitute exceeds requirement
DC Resistance (DCR)	1.18Ohm	700mOhm Max	Substitute provides lower resistance
Shielding	Unshielded	Unshielded	Exact match
Mounting Type	Surface Mount	Surface Mount	Exact match
Package Type	Nonstandard	Nonstandard	Equivalent classification
Inductance Test Frequency	100 kHz	100 kHz	Exact match
Size / Dimension	0.126" L x 0.126" W (3.20mm x 3.20mm)	0.138" L x 0.118" W (4.60mm x 3.00mm)	Footprint variation; verify PCB layout compatibility
Height - Seated (Max)	0.047" (1.20mm)	0.094" (2.40mm)	Substitute is taller; verify clearance
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant; substitute meets current standard
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent handling requirements

Engineering Selection Recommendations

The 7447732122 (Würth Elektronik WE-PD2 series) qualifies as a functional substitute for the obsolete ELC-3FN220M based on the following engineering criteria:

Electrical Compatibility: The substitute maintains the required 22 µH inductance at ±20% tolerance and exceeds the 330 mA current rating with a 530 mA capability. The lower DC resistance (700mOhm vs. 1.18Ohm) provides improved thermal performance and reduced power dissipation in the application circuit.

Compliance Status: Both components meet RoHS requirements. The substitute carries ROHS3 certification, representing current environmental compliance standards. Moisture sensitivity levels are equivalent (MSL 1), requiring identical handling and storage protocols.

Physical Integration Considerations: The substitute exhibits dimensional variations: the footprint is slightly larger (4.60mm x 3.00mm vs. 3.20mm x 3.20mm) and the seated height is doubled (2.40mm vs. 1.20mm). PCB layout verification is required to confirm clearance compatibility with surrounding components and circuit board constraints.

Product Status: The substitute is classified as Active, ensuring ongoing availability and supply chain stability compared to the obsolete original component.

Frequently Asked Questions (FAQ)

Q: Can the 7447732122 be used as a direct replacement for the ELC-3FN220M?

A: The 7447732122 meets all electrical substitution criteria: identical inductance (22 µH), equivalent tolerance (±20%), and superior current rating (530 mA vs. 330 mA). Physical dimensions require verification for PCB layout compatibility due to increased height (2.40mm vs. 1.20mm) and footprint variation.

Q: What is the significance of the lower DC resistance in the substitute part?

A: The substitute's 700mOhm DC resistance compared to the original 1.18Ohm results in reduced resistive losses and lower thermal dissipation. This represents an improvement in component efficiency and is compatible with circuit designs specified for the original part.

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

A: Both components are RoHS compliant. The substitute carries ROHS3 certification, which represents the current regulatory standard. Moisture sensitivity levels are identical (MSL 1), requiring equivalent handling procedures.

Q: How should the dimensional differences be evaluated?

A: The substitute is 0.024" (0.60mm) taller and has a slightly different footprint. Verify that the PCB layout accommodates the increased height and that the footprint dimensions do not conflict with adjacent component placement or circuit board edge constraints.

Q: Is the substitute part actively manufactured?

A: Yes, the 7447732122 is classified as Active product status, ensuring continued availability and supply chain support, unlike the obsolete ELC-3FN220M.

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