ELJ-FC2R2MF Equivalent & Substitute Parts

Part Overview

The ELJ-FC2R2MF is a 2.2 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 155 mA maximum current with 1.05Ohm DC resistance. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The part is housed in a 1008 (2520 Metric) surface mount package with ±20% inductance tolerance and operates across -20°C to 85°C.

Key Parameters

Parameter	Value
Inductance	2.2 µH
Inductance Tolerance	±20%
Current Rating	155 mA
DC Resistance (DCR)	1.05Ohm Max
Shielding	Unshielded
Package / Case	1008 (2520 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-FC2R2MF is determined by the following critical parameters:

Inductance value: 2.2 µH (±20% tolerance acceptable)
Package / Case: 1008 (2520 Metric) surface mount
Shielding configuration: Unshielded
Current rating: Must equal or exceed 155 mA
DC resistance: Lower values preferred for reduced losses
Operating temperature range: Must accommodate -20°C to 85°C minimum
Mounting type: Surface mount

Substitute parts are grouped into two categories:

Direct Substitutes (Active Status): NLCV25T-2R2M-EF and NLCV25T-2R2M-EFR from TDK Corporation. These parts maintain identical inductance, package, and unshielded configuration while offering superior current ratings (390 mA and 730 mA respectively) and lower DC resistance values.

Compatible Alternatives (Not For New Designs): NLCV25T-2R2M-PF, NLCV25T-2R2M-PFR, and NLV25T-2R2J-PF from TDK Corporation. These parts meet core electrical and mechanical requirements but carry product status restrictions.

Similar Substitute (Not For New Designs): MAMK2520T2R2M from Taiyo Yuden. This part differs in shielding (shielded vs. unshielded) and core material (metal vs. ferrite), making it suitable only when shielding requirements change.

Parameter Comparison

Parameter	ELJ-FC2R2MF (Main)	NLCV25T-2R2M-EF	NLCV25T-2R2M-EFR	NLCV25T-2R2M-PF	NLCV25T-2R2M-PFR	NLV25T-2R2J-PF	MAMK2520T2R2M
Manufacturer	Panasonic	TDK	TDK	TDK	TDK	TDK	Taiyo Yuden
Inductance	2.2 µH	2.2 µH	2.2 µH	2.2 µH	2.2 µH	2.2 µH	2.2 µH
Inductance Tolerance	±20%	±20%	±20%	±20%	±20%	±5%	±20%
Current Rating	155 mA	390 mA	730 mA	390 mA	730 mA	200 mA	1.9 A
DC Resistance (DCR)	1.05Ohm Max	650mOhm Max	324mOhm Max	650mOhm Max	324mOhm Max	1.55Ohm Max	117mOhm Max
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Shielded
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Operating Temperature	-20°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C
Product Status	Obsolete	Active	Active	Not For New Designs	Not For New Designs	Not For New Designs	Not For New Designs
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: NLCV25T-2R2M-EFR (TDK Corporation) is the preferred substitute. This part carries active product status, ensuring long-term availability and supply chain stability. It exceeds the original current rating (730 mA vs. 155 mA), provides significantly lower DC resistance (324mOhm vs. 1.05Ohm), and maintains identical package and inductance specifications. ROHS3 compliance and extended operating temperature range (-40°C to 105°C) provide additional design flexibility.

Secondary Recommendation: NLCV25T-2R2M-EF (TDK Corporation) offers similar advantages with active product status and ROHS3 compliance. Current rating of 390 mA and DC resistance of 650mOhm provide adequate performance for most applications requiring the original 155 mA rating.

Legacy Design Continuation: NLCV25T-2R2M-PF and NLCV25T-2R2M-PFR maintain electrical and mechanical compatibility but carry "Not For New Designs" status. These are suitable only for sustaining production of existing designs where component qualification has already been completed.

Alternative Consideration: NLV25T-2R2J-PF provides tighter inductance tolerance (±5% vs. ±20%) and higher Q factor (30 @ 7.96MHz) but carries "Not For New Designs" status and slightly higher DC resistance (1.55Ohm). Selection requires verification that the 200 mA current rating meets application requirements.

Shielded Alternative: MAMK2520T2R2M (Taiyo Yuden) is suitable only when electromagnetic shielding becomes a design requirement. The shielded configuration, metal core construction, and significantly lower DC resistance (117mOhm) represent a different inductor class and require full circuit re-evaluation.

Frequently Asked Questions (FAQ)

Q: Can NLCV25T-2R2M-EFR directly replace ELJ-FC2R2MF without circuit modification?

A: Yes, for applications where the original 155 mA current rating is the limiting factor. NLCV25T-2R2M-EFR maintains identical inductance (2.2 µH), tolerance (±20%), package (1008/2520 Metric), and unshielded configuration. The higher current rating (730 mA) and lower DC resistance (324mOhm) represent performance improvements. Verify that the extended operating temperature range (-40°C to 105°C vs. -20°C to 85°C) does not conflict with thermal management design assumptions.

Q: What is the difference between NLCV25T-2R2M-EF and NLCV25T-2R2M-EFR?

A: Both are TDK NLCV-EF series parts with identical inductance, tolerance, package, and unshielded configuration. NLCV25T-2R2M-EFR provides higher current rating (730 mA vs. 390 mA) and lower DC resistance (324mOhm vs. 650mOhm). Selection depends on application current requirements and acceptable power dissipation.

Q: Why is MAMK2520T2R2M listed as a similar substitute rather than a direct substitute?

A: MAMK2520T2R2M differs in two critical parameters: it is shielded (vs. unshielded) and uses metal core construction (vs. ferrite). These differences alter electromagnetic behavior and require circuit-level evaluation. Use this part only when shielding requirements change or when the superior current rating (1.9 A) and minimal DC resistance (117mOhm) justify the design change.

Q: Are "Not For New Designs" parts acceptable for production use?

A: "Not For New Designs" status indicates the manufacturer is not recommending these parts for new product development. They remain suitable for sustaining production of existing designs where component qualification has been completed and supply agreements are established. New designs should prioritize parts with "Active" status.

Q: Does inductance tolerance affect substitution eligibility?

A: Yes. The ELJ-FC2R2MF specifies ±20% tolerance. All listed substitutes maintain this tolerance except NLV25T-2R2J-PF, which offers tighter ±5% tolerance. Tighter tolerance provides better circuit performance but does not prevent substitution. Verify that circuit design does not depend on the wider tolerance band.

Q: What is the significance of Q factor differences between substitute parts?

A: Q factor (quality factor) indicates inductor efficiency at a specific frequency. Higher Q values represent lower losses. ELJ-FC2R2MF specifies Q of 25 @ 7.96MHz. NLCV25T-2R2M-EFR provides Q of 10 @ 7.96MHz (lower efficiency), while NLV25T-2R2J-PF provides Q of 30 @ 7.96MHz (higher efficiency). Selection depends on circuit sensitivity to inductor losses at the operating frequency.

Q: Can substitute parts be mixed in the same production batch?

A: Mixing substitute parts with different DC resistance values (ranging from 117mOhm to 1.55Ohm) will introduce circuit performance variation. Maintain part consistency within a production batch unless circuit design explicitly tolerates the resulting parameter spread.

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