ELJ-FB100JF Equivalent & Substitute Parts

Part Overview

The Panasonic ELJ-FB100JF is a 10 µH unshielded wirewound inductor rated for 235 mA with a maximum DC resistance of 1.8 Ohm, packaged in 1812 (4532 Metric) surface mount format. This component is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Inductance	10 µH
Tolerance	±5%
Current Rating	235 mA
DC Resistance (DCR)	1.8 Ohm Max
Shielding	Unshielded
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Inductance Value: Must be 10 µH with ±5% tolerance
Package / Case: Must be 1812 (4532 Metric) for mechanical fit
Mounting Type: Must be Surface Mount
Shielding: Must be Unshielded
Current Rating: Must meet or exceed 235 mA minimum
DC Resistance: Must not exceed 1.8 Ohm maximum

Substitute parts are grouped into two categories based on package compatibility and electrical performance:

Category A - Same Package (1812/4532 Metric): Parts maintaining identical physical dimensions and footprint, enabling direct PCB replacement without layout modification.

Category B - Different Package (1210/3225 Metric): Parts with different physical dimensions, requiring PCB layout adjustment but offering alternative electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Inductance	Current Rating (mA)	DCR (Ohm Max)	Package	Operating Temp	Product Status
ELJ-FB100JF	Panasonic	10 µH	235	1.8	1812	-20°C ~ 85°C	Obsolete
CM453232-100JL	Bourns Inc.	10 µH	250	1.6	1812	-40°C ~ 125°C	Active
IMC1812EB100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812ER100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812ES100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812EU100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812RQ100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812RV100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812RW100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
IMC1812BN100J	Vishay Dale	10 µH	250	1.6	1812	-55°C ~ 125°C	Active
1210R-103J	API Delevan Inc.	10 µH	297	2.1	1210	-55°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Substitutes (1812 Package - Direct Replacement)

For applications requiring identical PCB footprint compatibility, the following active parts meet all electrical parameters:

CM453232-100JL (Bourns Inc.): ROHS3 compliant, REACH unaffected. Provides improved DCR (1.6 Ohm vs. 1.8 Ohm) and higher current rating (250 mA vs. 235 mA). Extended operating temperature range (-40°C ~ 125°C).
IMC1812EB100J, IMC1812ER100J, IMC1812ES100J, IMC1812EU100J (Vishay Dale): ROHS3 compliant variants with REACH unaffected status. Identical electrical specifications to CM453232-100JL. Extended operating temperature range (-55°C ~ 125°C).
IMC1812RQ100J, IMC1812RV100J, IMC1812RW100J (Vishay Dale): RoHS non-compliant variants with REACH affected status. Equivalent electrical performance but subject to regulatory restrictions in certain markets.
IMC1812BN100J (Vishay Dale): RoHS non-compliant, REACH affected. Bulk packaging option with equivalent electrical specifications.

Alternative Substitute (1210 Package - Layout Modification Required)

1210R-103J (API Delevan Inc.): ROHS3 compliant, REACH unaffected. Smaller physical footprint (1210 vs. 1812) requires PCB layout redesign. Provides higher current rating (297 mA) and extended temperature range (-55°C ~ 125°C). DCR specification (2.1 Ohm max) exceeds the original part requirement.

Frequently Asked Questions (FAQ)

Q: Can I use a 1210 package inductor as a direct replacement for the 1812 package ELJ-FB100JF?

A: No. The 1210R-103J has different physical dimensions (0.128" L x 0.095" W vs. 0.177" L x 0.126" W) and cannot fit the existing PCB footprint without layout modification. Use only if PCB redesign is feasible.

Q: What is the difference between the various Vishay Dale IMC1812 variants (EB, ER, ES, EU, RQ, RV, RW)?

A: The variants differ in packaging format and regulatory compliance. EB, ER, ES, and EU are ROHS3 compliant with REACH unaffected status. RQ, RV, and RW are RoHS non-compliant with REACH affected status. All variants maintain identical electrical specifications (10 µH, 250 mA, 1.6 Ohm DCR).

Q: Is the improved DCR (1.6 Ohm vs. 1.8 Ohm) of substitute parts beneficial?

A: Lower DCR reduces resistive losses and heat generation. This is an improvement over the original specification and does not create compatibility issues.

Q: Which substitute part offers the best regulatory compliance?

A: CM453232-100JL and the ROHS3-compliant Vishay Dale variants (IMC1812EB100J, IMC1812ER100J, IMC1812ES100J, IMC1812EU100J) provide ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Q: Can I use parts with higher current ratings than the original 235 mA specification?

A: Yes. All substitute parts rated at 250 mA or higher are electrically compatible. Higher current ratings provide design margin without affecting circuit operation.

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