ELJ-FC120JF Equivalent & Substitute Parts

Part Overview

The ELJ-FC120JF is a 12 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 75 mA maximum current with 4.1Ohm DC resistance in a 1008 (2520 Metric) surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and design continuity. Substitute parts must maintain the same inductance value, tolerance, package footprint, and mounting type while meeting or exceeding the current rating and thermal performance requirements of the original specification.

Key Parameters

Parameter	ELJ-FC120JF
Inductance	12 µH
Tolerance	±5%
Current Rating	75 mA
DC Resistance (DCR)	4.1Ohm Max
Package / Case	1008 (2520 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-20°C ~ 85°C
Frequency - Self Resonant	30 MHz

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following mandatory parameters:

Inductance Value: Must be 12 µH ±5%
Package / Case: Must be 1008 (2520 Metric) surface mount
Shielding: Must be unshielded
Current Rating: Must equal or exceed 75 mA
DC Resistance: Lower or equal values are acceptable
Self Resonant Frequency: Must be 30 MHz or higher
Inductance Frequency Test: Must be 2.52 MHz

All substitute parts listed meet these core electrical and mechanical compatibility criteria. Differences in core material (ferrite vs. wirewound), product status, and compliance certifications are noted for engineering selection purposes but do not disqualify substitution based on electrical performance.

Parameter Comparison

Parameter	ELJ-FC120JF	IMC1008ER120J	NLV25T-120J-EF	NLV25T-120J-EFD	NLV25T-120J-PF	1008-123J
Manufacturer	Panasonic	Vishay Dale	TDK	TDK	TDK	API Delevan
Inductance	12 µH	12 µH	12 µH	12 µH	12 µH	12 µH
Tolerance	±5%	±5%	±5%	±5%	±5%	±5%
Current Rating (mA)	75	140	150	150	150	207
DC Resistance (Ohm Max)	4.1	3.6	3.8	3.8	3.8	4.6
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)	Nonstandard
Shielding	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded	Unshielded
Self Resonant Frequency (MHz)	30	30	30	30	30	24
Operating Temperature	-20°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Not For New Designs	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance)

IMC1008ER120J (Vishay Dale) and NLV25T-120J-EF (TDK) are the preferred substitutes. Both are active products with ROHS3 compliance and exceed the original current rating (140 mA and 150 mA respectively). IMC1008ER120J offers lower DC resistance (3.6Ohm) and extended temperature range (-40°C ~ 125°C). NLV25T-120J-EF provides identical Q factor performance at 2.52 MHz and maintains the standard 1008 package footprint.

Secondary Substitute (Active Status, Automotive Rated)

NLV25T-120J-EFD (TDK) is functionally equivalent to NLV25T-120J-EF with the addition of AEC-Q200 automotive qualification. This part is suitable for applications requiring automotive-grade reliability and compliance.

Legacy Substitute (Not For New Designs)

NLV25T-120J-PF (TDK) is classified as "Not For New Designs" and should be avoided for new product development, though it remains electrically compatible and is available in high inventory (53,291 pcs).

Nonstandard Package Consideration

1008-123J (API Delevan) features a nonstandard package footprint (2.66mm x 2.41mm vs. 2.50mm x 2.00mm standard) and lower self-resonant frequency (24 MHz). This part is not recommended as a direct substitute due to PCB layout incompatibility and reduced high-frequency performance.

Frequently Asked Questions (FAQ)

Q: Can IMC1008ER120J directly replace ELJ-FC120JF on existing PCBs?

A: Yes. Both parts use the 1008 (2520 Metric) surface mount package with identical footprint dimensions (0.098" L x 0.079" W). The slightly increased height (1.90mm vs. 1.80mm) is within standard PCB assembly tolerances.

Q: What is the difference between NLV25T-120J-EF and NLV25T-120J-EFD?

A: Both parts are electrically identical with 12 µH inductance, 150 mA current rating, and 3.8Ohm DC resistance. NLV25T-120J-EFD includes AEC-Q200 automotive qualification and is suitable for automotive applications. NLV25T-120J-EF is for general industrial use.

Q: Why is 1008-123J not recommended as a substitute?

A: The 1008-123J uses a nonstandard package footprint (2.66mm x 2.41mm) that does not match the standard 1008 (2520 Metric) specification (2.50mm x 2.00mm). PCB layout modifications would be required. Additionally, its self-resonant frequency is 24 MHz, below the 30 MHz specification of the original part.

Q: Is NLV25T-120J-PF suitable for new designs?

A: No. This part is classified as "Not For New Designs" by TDK. While electrically compatible, it should only be used for legacy product support or repair applications. Use NLV25T-120J-EF or NLV25T-120J-EFD for new designs.

Q: What are the key parameters that determine substitution compatibility?

A: Inductance (12 µH ±5%), package footprint (1008 / 2520 Metric), current rating (minimum 75 mA), DC resistance (4.1Ohm or lower), self-resonant frequency (30 MHz or higher), and unshielded configuration. All listed substitutes meet these criteria.

Q: Do all substitutes meet RoHS compliance?

A: IMC1008ER120J, NLV25T-120J-EF, NLV25T-120J-EFD, and NLV25T-120J-PF are ROHS3 compliant. 1008-123J is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message