ELJ-FC4R7KF Equivalent & Substitute Parts

Part Overview

The ELJ-FC4R7KF is a 4.7 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 125 mA maximum current with a DC resistance of 1.55Ohm Max. This surface mount component is packaged in the 1008 (2520 Metric) form factor and operates across the temperature range of -20°C to 85°C.

The product is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within the specified inductance, current rating, and DC resistance parameters while accommodating the same physical package footprint.

Substiute Parts

ELJ-FC4R7KF

Panasonic Electronic ComponentsIn Stock: 1054ELJ-FC4R7KF Datasheet

Current PartRFQ

NLV25T-4R7J-PF

TDK CorporationIn Stock: 16721NLV25T-4R7J-PF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-FC4R7KF is determined by the following critical parameters:

• Inductance Value: Must be 4.7 µH (tolerance variations acceptable within industry standards)
• Package / Case: Must be 1008 (2520 Metric) to ensure PCB footprint compatibility
• Mounting Type: Must be Surface Mount for assembly process compatibility
• Current Rating: Must meet or exceed 125 mA to support circuit requirements
• DC Resistance: Must not significantly exceed 1.55Ohm Max to maintain circuit performance
• Shielding Configuration: Unshielded specification must be maintained

The substitute part NLV25T-4R7J-PF manufactured by TDK Corporation meets these core substitution criteria. It maintains the identical inductance value, package footprint, and mounting type while providing enhanced current rating (175 mA) and improved temperature operating range (-40°C ~ 105°C).

Parameter Comparison

Engineering Selection Recommendations

The NLV25T-4R7J-PF from TDK Corporation is a qualified substitute for the obsolete ELJ-FC4R7KF. Both components share identical inductance specifications, package footprints, and mounting configurations, ensuring direct PCB compatibility.

The TDK substitute offers operational advantages including higher current rating capacity (175 mA versus 125 mA), tighter inductance tolerance (±5% versus ±10%), and extended temperature operating range (-40°C ~ 105°C versus -20°C ~ 85°C). The TDK part is classified as Not For New Designs but maintains ROHS3 compliance and REACH compliance status.

The primary design consideration is the increased DC resistance of the substitute (2.3Ohm Max versus 1.55Ohm Max). Circuit designs dependent on minimal resistive losses should evaluate this parameter against application requirements. The substitute's ferrite drum core construction differs from the original wirewound design, which may affect high-frequency performance characteristics in sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-4R7J-PF be used as a direct replacement for ELJ-FC4R7KF?

A: Yes, for applications where the increased DC resistance (2.3Ohm Max) and extended temperature range do not conflict with circuit specifications. Both components maintain the same 1008 (2520 Metric) package footprint and surface mount configuration.

Q: What is the impact of the higher DC resistance in the substitute part?

A: The NLV25T-4R7J-PF exhibits 0.75Ohm additional DC resistance compared to the original part. This increases resistive losses in the inductor. Circuit designs with tight power budget or thermal constraints should evaluate this parameter against application requirements.

Q: Are there packaging differences between these parts?

A: Both components use identical 1008 (2520 Metric) surface mount packaging with matching physical dimensions (0.098" L x 0.079" W). The substitute has a slightly greater seated height (0.075" versus 0.071"), which remains within typical PCB assembly tolerances.

Q: What is the difference between wirewound and drum core construction?

A: The original ELJ-FC4R7KF uses wirewound construction, while the NLV25T-4R7J-PF uses drum core wirewound construction with ferrite material. This affects core loss characteristics and high-frequency performance. Applications operating at frequencies near the self-resonant point should evaluate this difference.

Q: Does the substitute part have better compliance certifications?

A: The NLV25T-4R7J-PF carries ROHS3 and REACH compliance certifications. Both parts maintain MSL 1 (Unlimited) moisture sensitivity rating and EAR99 export classification.