ELJ-FC1R2KF Equivalent & Substitute Parts

Part Overview

The ELJ-FC1R2KF is a 1.2 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 180 mA maximum current with 750mOhm DC resistance. This surface mount component in 1008 (2520 Metric) package is designed for applications requiring compact fixed inductance in the microhenry range. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

ELJ-FC1R2KF

Panasonic Electronic ComponentsIn Stock: 757ELJ-FC1R2KF Datasheet

Current PartRFQ

NLV25T-1R2J-PF

TDK CorporationIn Stock: 37424NLV25T-1R2J-PF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELJ-FC1R2KF is determined by the following critical parameters:

• Inductance Value: Must be 1.2 µH to maintain circuit function
• Package / Case: Must be 1008 (2520 Metric) for PCB footprint compatibility
• Mounting Type: Must be Surface Mount for assembly compatibility
• Current Rating: Must meet or exceed 180 mA requirement
• DC Resistance: Must not exceed 750mOhm to maintain electrical performance
• Shielding: Must be Unshielded to match original design
• Operating Temperature Range: Must encompass or exceed -20°C ~ 85°C

The NLV25T-1R2J-PF from TDK Corporation meets all substitution criteria with identical inductance, package, and mounting specifications while providing enhanced current rating (230 mA) and improved tolerance (±5%).

Parameter Comparison

Engineering Selection Recommendations

The NLV25T-1R2J-PF is a direct functional substitute for the obsolete ELJ-FC1R2KF. Selection should be based on the following factors:

Compliance and Certification: The NLV25T-1R2J-PF carries ROHS3 compliance and REACH Affected status, meeting modern regulatory requirements. The original ELJ-FC1R2KF lacks documented compliance certifications.

Product Status: The ELJ-FC1R2KF is obsolete with limited inventory (648 Pcs). The NLV25T-1R2J-PF is marked "Not For New Designs" but maintains substantial inventory (37400 Pcs), providing immediate availability for replacement applications.

Electrical Performance: The substitute part provides superior specifications including tighter tolerance (±5% vs ±10%), higher current rating (230 mA vs 180 mA), and extended operating temperature range (-40°C ~ 105°C vs -20°C ~ 85°C). The increased DC resistance (1.2Ohm vs 750mOhm) must be evaluated against circuit requirements.

Physical Compatibility: Both parts share identical footprint dimensions and package specifications, ensuring direct PCB compatibility with minimal design modification.

Frequently Asked Questions (FAQ)

Q: Can the NLV25T-1R2J-PF directly replace the ELJ-FC1R2KF without PCB modification?

A: Yes. Both parts use the 1008 (2520 Metric) surface mount package with identical footprint dimensions (0.098" L x 0.079" W). The maximum seated height difference (0.075" vs 0.071") is within standard PCB assembly tolerances.

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

A: The NLV25T-1R2J-PF has 1.2Ohm maximum DCR compared to 750mOhm in the original. This increases resistive losses and heat generation. Circuit analysis is required to confirm acceptability for your specific application.

Q: Are there packaging differences between these parts?

A: The original ELJ-FC1R2KF is supplied in standard packaging. The NLV25T-1R2J-PF is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly.

Q: What is the significance of the different self-resonant frequencies?

A: The NLV25T-1R2J-PF has a self-resonant frequency of 230MHz compared to 100MHz for the original. This indicates different parasitic capacitance characteristics and may affect performance at higher frequencies. Application frequency requirements should be verified.

Q: Is the substitute part suitable for new designs?

A: The NLV25T-1R2J-PF is marked "Not For New Designs," indicating it is a legacy product. For new designs, consultation with TDK for current-generation alternatives is recommended, though this part remains suitable for replacement and legacy applications.