ELJ-NDR47KF Equivalent & Substitute Parts

Part Overview

The Panasonic ELJ-NDR47KF is a 470 nH unshielded wirewound inductor rated for 145 mA with a maximum DC resistance of 2.56Ohm in 0805 (2012 Metric) surface mount package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Substitute parts must maintain the 470 nH inductance specification while accommodating variations in current rating, DC resistance, and core material within acceptable operating parameters.

Substiute Parts

ELJ-NDR47KF

Panasonic Electronic ComponentsIn Stock: 979ELJ-NDR47KF Datasheet

Current PartRFQ

74476032C

Würth ElektronikIn Stock: 424574476032C Datasheet

DirectRFQ

B82498F3471J000

EPCOS - TDK ElectronicsIn Stock: 11883B82498F3471J000 Datasheet

SimilarRFQ

LRW0805FKR47GV001E

Johanson Technology Inc.In Stock: 1000LRW0805FKR47GV001E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Criteria:

• Inductance value: 470 nH (exact match required)
• Shielding configuration: Unshielded (must match)
• Mounting type: Surface Mount (must match)
• Package classification: 0805 or equivalent footprint compatibility

Secondary Compatibility Criteria:

• Current rating must equal or exceed the application requirement (145 mA minimum)
• DC resistance should not significantly degrade circuit performance
• Operating temperature range must encompass the application environment
• Inductance tolerance must be compatible with circuit design margins

The three substitute parts listed below satisfy the primary matching criteria and provide varying performance characteristics in secondary parameters.

Parameter Comparison

Engineering Selection Recommendations

74476032C (Würth Elektronik WE-KI Series)

This substitute provides active product status with ROHS3 compliance. Current rating of 250 mA exceeds the original 145 mA requirement. DC resistance of 2.3Ohm is comparable to the original specification. Operating temperature range extends to -40°C ~ 125°C, providing broader environmental coverage. Inductance tolerance of ±5% offers improved precision over the original ±10%. Core material is ceramic rather than non-magnetic, which may affect high-frequency behavior in sensitive applications.

B82498F3471J000 (EPCOS - TDK SIMID Series)

This substitute offers the lowest DC resistance at 1.9Ohm maximum, reducing power dissipation. Current rating of 190 mA exceeds the original requirement. AEC-Q200 automotive qualification is provided. Operating temperature range of -55°C ~ 125°C is the widest available. ROHS3 compliance is confirmed. Inductance tolerance of ±5% provides improved specification control. Ceramic core material and nonstandard package dimensions require verification for mechanical fit.

LRW0805FKR47GV001E (Johanson Technology)

This substitute provides the highest current rating at 500 mA and the lowest DC resistance at 950mOhm, offering superior thermal performance. Standard 0805 (2012 Metric) package ensures direct mechanical compatibility. ROHS3 and REACH compliance are confirmed. Operating temperature range of -40°C ~ 85°C matches the upper limit of the original specification. Ferrite core material differs from the original non-magnetic core, which may introduce frequency-dependent behavior changes.

Frequently Asked Questions (FAQ)

Q: Can all three substitute parts be used interchangeably with the ELJ-NDR47KF?

A: All three substitutes maintain the 470 nH inductance specification and unshielded surface mount configuration. However, differences in core material (ceramic or ferrite versus non-magnetic), DC resistance, and current rating may affect circuit performance. Verification is required for applications sensitive to core material properties or operating at the thermal limits of the original design.

Q: Which substitute has the best package compatibility?

A: The LRW0805FKR47GV001E maintains the standard 0805 (2012 Metric) package specification identical to the original. The Würth Elektronik 74476032C and EPCOS B82498F3471J000 use nonstandard packages with 0805 supplier designation, requiring physical dimension verification against PCB footprints.

Q: What is the impact of different core materials on circuit performance?

A: The original ELJ-NDR47KF uses a non-magnetic core. The Würth and EPCOS substitutes use ceramic cores, while the Johanson uses a ferrite core. Core material affects frequency response, Q factor, and self-resonant frequency. Applications operating near the self-resonant frequency or requiring specific frequency characteristics should evaluate core material compatibility.

Q: Are all substitutes suitable for automotive applications?

A: The EPCOS B82498F3471J000 carries AEC-Q200 automotive qualification. The Würth Elektronik 74476032C and Johanson Technology LRW0805FKR47GV001E do not specify automotive qualification. Automotive applications should prioritize the EPCOS part or verify alternative parts against specific automotive requirements.

Q: How do inductance tolerances affect circuit design?

A: The original ELJ-NDR47KF specifies ±10% tolerance. The Würth Elektronik and EPCOS substitutes offer ±5% tolerance, providing tighter inductance control. The Johanson part maintains ±10% tolerance. Circuits designed with the original ±10% tolerance can accommodate any substitute. Circuits requiring tighter tolerance control benefit from the ±5% alternatives.

Q: What are the thermal considerations when selecting a substitute?

A: The LRW0805FKR47GV001E offers the lowest DC resistance at 950mOhm, resulting in the lowest power dissipation and heat generation. The EPCOS B82498F3471J000 at 1.9Ohm and Würth Elektronik 74476032C at 2.3Ohm provide intermediate thermal performance. Applications with thermal constraints should prioritize the Johanson part.

Q: Can the substitute parts operate outside the original temperature range?

A: The original ELJ-NDR47KF operates from -20°C ~ 85°C. The EPCOS B82498F3471J000 extends to -55°C ~ 125°C, and the Würth Elektronik 74476032C to -40°C ~ 125°C. The Johanson part operates to -40°C ~ 85°C. Applications requiring operation outside the original range should select substitutes with appropriate temperature specifications.