ELJ-FB331JF Equivalent & Substitute Parts

Part Overview

The ELJ-FB331JF is a 330 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 75 mA with a maximum DC resistance of 16 Ohm in a 1812 (4532 Metric) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Inductance	330 µH
Tolerance	±5%
Current Rating	75 mA
DC Resistance (DCR)	16 Ohm Max
Package / Case	1812 (4532 Metric)
Mounting Type	Surface Mount
Shielding	Unshielded
Operating Temperature	-20°C ~ 85°C
Q @ Frequency	40 @ 796 kHz
Frequency - Self Resonant	3.7 MHz

Substitute Part Grouping Explanation

Substitution for the ELJ-FB331JF is determined by the following critical parameters: inductance value (330 µH), tolerance (±5%), package format (1812 / 4532 Metric), mounting type (surface mount), and electrical performance within acceptable operating ranges. The primary substitutes maintain identical inductance and tolerance specifications while offering improved current ratings (85 mA) and lower DC resistance (14 Ohm Max), providing enhanced performance margins. All substitute parts are housed in the same 1812 package footprint, ensuring mechanical and electrical compatibility.

The substitute parts are grouped into two categories:

Category 1: Unshielded Drum Core Wirewound Inductors (85 mA rated)

CM453232-331JL (Bourns Inc.)
IMC1812BN331J (Vishay Dale)
IMC1812EB331J (Vishay Dale)
IMC1812ES331J (Vishay Dale)
IMC1812RQ331J (Vishay Dale)

Category 2: Shielded Inductor (129 mA rated)

S1812R-334J (API Delevan Inc.)

Category 3: Similar Unshielded Inductor (120 mA rated)

1812-334J (API Delevan Inc.)

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR (Ohm Max)	Shielding	Operating Temp	Package	Product Status
ELJ-FB331JF	Panasonic	330 µH	±5%	75	16	Unshielded	-20°C ~ 85°C	1812	Obsolete
CM453232-331JL	Bourns Inc.	330 µH	±5%	85	14	Unshielded	-40°C ~ 125°C	1812	Active
IMC1812BN331J	Vishay Dale	330 µH	±5%	85	14	Unshielded	-55°C ~ 125°C	1812	Active
IMC1812EB331J	Vishay Dale	330 µH	±5%	85	14	Unshielded	-55°C ~ 125°C	1812	Active
IMC1812ES331J	Vishay Dale	330 µH	±5%	85	14	Unshielded	-55°C ~ 125°C	1812	Active
IMC1812RQ331J	Vishay Dale	330 µH	±5%	85	14	Unshielded	-55°C ~ 125°C	1812	Active
S1812R-334J	API Delevan Inc.	330 µH	±5%	129	12	Shielded	-55°C ~ 125°C	1812	Active
1812-334J	API Delevan Inc.	330 µH	±5%	120	14	Unshielded	-55°C ~ 125°C	1812	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

The CM453232-331JL, IMC1812EB331J, and IMC1812ES331J are the preferred direct substitutes. These parts maintain identical inductance and tolerance specifications while providing superior electrical performance with 85 mA current ratings and 14 Ohm maximum DC resistance. The IMC1812EB331J and IMC1812ES331J offer RoHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The CM453232-331JL provides active product status with ROHS3 compliance and extended operating temperature range (-40°C to 125°C).

Alternative Substitutes

The IMC1812BN331J and IMC1812RQ331J are functionally equivalent alternatives with identical electrical specifications but carry RoHS non-compliant and REACH affected designations. These parts remain electrically suitable but may not satisfy procurement requirements for new designs requiring regulatory compliance.

Extended Performance Options

The S1812R-334J (shielded, 129 mA) and 1812-334J (unshielded, 120 mA) offer higher current ratings and lower DC resistance. The S1812R-334J introduces shielding, which may alter electromagnetic coupling characteristics in the circuit. The 1812-334J carries RoHS non-compliant status. Selection of these parts requires circuit-level evaluation to confirm compatibility with the original design intent.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct drop-in replacement for the ELJ-FB331JF?

A: The CM453232-331JL, IMC1812EB331J, and IMC1812ES331J are direct substitutes with identical inductance (330 µH), tolerance (±5%), and 1812 package format. All maintain the same footprint and mounting type. The higher current ratings (85 mA vs. 75 mA) and lower DC resistance (14 Ohm vs. 16 Ohm) provide improved performance margins.

Q: What is the difference between shielded and unshielded inductors?

A: The ELJ-FB331JF and most substitutes are unshielded. The S1812R-334J is shielded. Shielding reduces electromagnetic radiation and susceptibility to external fields but may affect circuit behavior. Shielded inductors are not direct substitutes without circuit validation.

Q: Why do some substitutes have higher current ratings?

A: The substitute parts use drum core ferrite construction, which provides better thermal performance and lower DC resistance compared to the original wirewound design. This results in higher current handling capability (85 mA to 129 mA) while maintaining the same inductance value.

Q: Are there packaging differences between these parts?

A: All parts use the 1812 (4532 Metric) surface mount package. Physical dimensions are consistent across all substitutes, ensuring PCB footprint compatibility. Packaging format (Tape & Reel vs. Bulk) affects procurement and handling but not electrical or mechanical compatibility.

Q: Which substitute should I choose for new designs?

A: For new designs, select from CM453232-331JL, IMC1812EB331J, or IMC1812ES331J. These parts offer active product status, regulatory compliance (RoHS3, REACH unaffected), and extended operating temperature ranges (-40°C to -55°C minimum, 125°C maximum). These characteristics ensure long-term availability and compliance with current industry standards.

Q: What is the significance of the operating temperature range difference?

A: The ELJ-FB331JF operates from -20°C to 85°C. Most substitutes extend this range to -40°C to -55°C minimum and 125°C maximum. Verify that your application requirements fall within the selected substitute's operating range. Extended temperature ranges provide design flexibility for harsh environment applications.

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