ELJ-FCR39MF Equivalent & Substitute Parts

Part Overview

The ELJ-FCR39MF is a 390 nH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 160 mA maximum current with 950mOhm maximum DC resistance. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The part is packaged in 1008 (2520 Metric) surface mount format with RoHS compliance and unlimited moisture sensitivity rating.

Substiute Parts

ELJ-FCR39MF

Panasonic Electronic ComponentsIn Stock: 3020ELJ-FCR39MF Datasheet

Current PartRFQ

NLV25T-R39J-PF

TDK CorporationIn Stock: 17992NLV25T-R39J-PF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-FCR39MF is determined by the following critical parameters:

Inductance value must be 390 nH to maintain circuit function. The inductance tolerance of ±20% establishes the acceptable range for this specification.

Current rating must meet or exceed 160 mA to ensure the substitute part can handle the design's maximum current demand without saturation or thermal stress.

DC resistance must not exceed 950mOhm to maintain power dissipation characteristics within design specifications.

Package and mounting type must remain 1008 (2520 Metric) surface mount to ensure physical and electrical compatibility with existing PCB layouts.

Operating temperature range must encompass or exceed the -20°C ~ 85°C specification to support the intended application environment.

The substitute part NLV25T-R39J-PF from TDK Corporation meets these core substitution criteria while offering enhanced electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The NLV25T-R39J-PF qualifies as a direct substitute for the obsolete ELJ-FCR39MF based on matching inductance value, package format, and mounting type. The substitute part exceeds minimum requirements across multiple parameters: current rating of 375 mA provides 234% margin above the 160 mA requirement, DC resistance of 650mOhm is 32% lower than the 950mOhm maximum, and operating temperature range extends from -40°C to 105°C, encompassing the original -20°C to 85°C specification.

The NLV25T-R39J-PF carries ROHS3 compliance status, meeting current regulatory requirements. The inductance tolerance of ±5% on the substitute part is tighter than the ±20% tolerance of the original component, providing improved circuit performance consistency.

The substitute part is classified as "Not For New Designs" by TDK, indicating it remains available for replacement and legacy support applications but is not recommended for new product development initiatives.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-R39J-PF directly replace the ELJ-FCR39MF in existing designs?

A: Yes. Both parts share identical inductance value (390 nH), package format (1008 / 2520 Metric), and mounting type (surface mount). The substitute part meets or exceeds all critical electrical parameters required by the original design.

Q: What are the key differences between these two inductors?

A: The NLV25T-R39J-PF offers superior electrical performance: higher current rating (375 mA vs. 160 mA), lower DC resistance (650mOhm vs. 950mOhm), tighter inductance tolerance (±5% vs. ±20%), and extended operating temperature range (-40°C to 105°C vs. -20°C to 85°C). The substitute uses a drum core ferrite construction compared to the original wirewound design.

Q: Are there any physical dimension differences between these parts?

A: Both parts use the 1008 (2520 Metric) package with identical length and width (0.098" L x 0.079" W / 2.50mm x 2.00mm). Maximum seated height differs slightly: 0.071" (1.80mm) for the original versus 0.075" (1.90mm) for the substitute. This 0.004" difference is within typical PCB assembly tolerances.

Q: What is the significance of the "Not For New Designs" status on the substitute part?

A: This designation indicates the NLV25T-R39J-PF remains available for replacement and legacy support but is not recommended for new product development. For new designs, consult TDK's current inductor portfolio for actively supported alternatives.

Q: How do the Q factor values compare?

A: At 25.2 MHz test frequency, the substitute part (Q = 30) provides higher quality factor than the original (Q = 25), indicating lower losses and improved efficiency at this frequency.