ELJ-FA1R8KF Equivalent & Substitute Parts

Part Overview

The ELJ-FA1R8KF is a 1.8 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 200 mA with a maximum DC resistance of 820 mOhm. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part is housed in a 1210 (3225 Metric) surface mount package with ±10% inductance tolerance and operates across -20°C to 85°C.

Key Parameters

Parameter	Value
Inductance	1.8 µH
Inductance Tolerance	±10%
Current Rating	200 mA
DC Resistance (DCR)	820 mOhm Max
Shielding	Unshielded
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Q @ Freq	30 @ 7.96 MHz
Frequency - Self Resonant	85 MHz

Substitute Part Grouping Explanation

Substitution for the ELJ-FA1R8KF is determined by the following critical parameters:

Primary Matching Criteria:

Inductance value: 1.8 µH (exact match required)
Inductance tolerance: ±10% or tighter
DC resistance: 820 mOhm maximum
Current rating: minimum 200 mA
Package / Case: 1210 (3225 Metric) or equivalent footprint
Mounting type: Surface Mount
Shielding: Unshielded

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (Exact Parameter Match): Parts meeting all primary criteria with identical or superior electrical performance within the specified operating envelope. These include CM322522-1R8JL, CM322522-1R8KL, and PM1210-1R8J-RC.

Category 2 - Functional Substitutes (Enhanced Performance): Parts exceeding the original specifications in current rating or DC resistance while maintaining the same inductance, tolerance, and package footprint. These include B82422A1182K100, IMC1210BN1R8K, IMC1210EB1R8K, IMC1210ER1R8K, and IMC1210SY1R8K. These parts provide additional design margin and are suitable for applications where higher current capacity or lower resistance is beneficial.

Excluded from Substitution: ISC1210EB1R8K is excluded due to shielded construction, which differs from the unshielded specification of the original part. B82422T1182K000 is classified as similar but not direct substitute due to higher current rating (350 mA) and different DCR specification (800 mOhm).

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Package	Shielding	Operating Temp	Product Status
ELJ-FA1R8KF	Panasonic	1.8 µH	±10%	200	820	1210 (3225)	Unshielded	-20°C ~ 85°C	Obsolete
CM322522-1R8JL	Bourns	1.8 µH	±5%	200	820	Nonstandard	Unshielded	-40°C ~ 125°C	Active
CM322522-1R8KL	Bourns	1.8 µH	±10%	200	820	Nonstandard	Unshielded	-40°C ~ 125°C	Active
PM1210-1R8J-RC	Bourns	1.8 µH	±5%	200	820	1210 (3225)	Unshielded	-40°C ~ 125°C	Active
B82422A1182K100	EPCOS - TDK	1.8 µH	±10%	290	600	2-SMD, J-Lead	Unshielded	-55°C ~ 125°C	Active
IMC1210BN1R8K	Vishay Dale	1.8 µH	±10%	350	900	1210 (3225)	Unshielded	-55°C ~ 125°C	Active
IMC1210EB1R8K	Vishay Dale	1.8 µH	±10%	350	900	1210 (3225)	Unshielded	-55°C ~ 125°C	Active
IMC1210ER1R8K	Vishay Dale	1.8 µH	±10%	350	900	1210 (3225)	Unshielded	-55°C ~ 125°C	Active
IMC1210SY1R8K	Vishay Dale	1.8 µH	±10%	350	900	1210 (3225)	Unshielded	-55°C ~ 125°C	Active
B82422T1182K000	EPCOS - TDK	1.8 µH	±10%	350	800	2-SMD, J-Lead	Unshielded	-55°C ~ 125°C	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

PM1210-1R8J-RC (Bourns) is the primary recommendation for direct replacement. This part maintains the 1210 (3225 Metric) package footprint, matches the 200 mA current rating and 820 mOhm DCR specification, and is in active production status. The ±5% inductance tolerance provides tighter control than the original ±10%. Operating temperature range extends to -40°C ~ 125°C, exceeding the original specification. RoHS3 compliance and REACH unaffected status support modern supply chain requirements.

CM322522-1R8KL (Bourns) provides an alternative direct equivalent with matching ±10% tolerance. This part is in active production with extended temperature range and RoHS3 compliance. Package designation is listed as nonstandard; physical dimensions match the original (3.20mm x 2.50mm x 2.20mm max height).

For Enhanced Performance Applications:

IMC1210ER1R8K (Vishay Dale) offers the highest inventory availability (11,090 pcs) among active substitutes. This part increases current rating to 350 mA while maintaining the 1210 package footprint and unshielded construction. The 900 mOhm DCR is within acceptable tolerance for most applications. RoHS3 compliance and extended temperature range (-55°C ~ 125°C) support demanding environments. Tape & Reel packaging supports automated assembly.

B82422A1182K100 (EPCOS - TDK Electronics) provides the lowest DCR specification (600 mOhm max) with 290 mA current rating. AEC-Q200 automotive qualification and extended temperature range (-55°C ~ 125°C) support automotive and industrial applications. Package configuration is 2-SMD, J-Lead with 1210 (3225 Metric) supplier device package.

Compliance Considerations:

All recommended substitutes carry RoHS3 compliance and REACH unaffected status, aligning with current regulatory requirements. IMC1210BN1R8K and IMC1210SY1R8K are RoHS non-compliant and REACH affected; these are not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher current rating than the original 200 mA specification?

A: Yes. Parts rated for 350 mA (IMC-1210 series) or 290 mA (B82422A1182K100) are functionally compatible. Higher current rating provides additional design margin and does not compromise circuit operation when the actual current draw remains at or below 200 mA. Verify that the higher DCR specification (900 mOhm vs. 820 mOhm) does not impact circuit performance.

Q: What is the difference between the Bourns CM322522 variants (CM322522-1R8JL vs. CM322522-1R8KL)?

A: Both parts are electrically equivalent 1.8 µH inductors with 200 mA rating and 820 mOhm DCR. The primary difference is inductance tolerance: CM322522-1R8JL specifies ±5% tolerance while CM322522-1R8KL specifies ±10% tolerance. Select based on circuit tolerance requirements. Both are in active production with identical physical dimensions and operating temperature range.

Q: Is the package footprint identical between all substitute options?

A: The 1210 (3225 Metric) package is standard across most substitutes (PM1210-1R8J-RC, IMC-1210 series). Bourns CM322522 parts are designated as nonstandard package but maintain identical physical dimensions (3.20mm x 2.50mm footprint). EPCOS B82422 series uses 2-SMD, J-Lead package configuration with 1210 (3225 Metric) supplier device package. Verify PCB layout compatibility before selection.

Q: What is the operating temperature range difference, and does it matter?

A: The original ELJ-FA1R8KF operates -20°C ~ 85°C. Most active substitutes extend to -40°C ~ 125°C. This wider range supports industrial and automotive applications. If your application operates within the original -20°C ~ 85°C envelope, any substitute is suitable. For applications requiring extended low-temperature operation below -20°C, verify substitute part performance specifications.

Q: Why is ISC1210EB1R8K not recommended as a substitute?

A: ISC1210EB1R8K is shielded construction, while the original ELJ-FA1R8KF is unshielded. Shielding introduces electromagnetic isolation that alters circuit behavior and may cause unintended effects in sensitive applications. Use only if shielding is specifically required by circuit design.

Q: What packaging format should I select for automated assembly?

A: For tape & reel (TR) packaging suitable for pick-and-place assembly, select PM1210-1R8J-RC, B82422A1182K100, B82422T1182K000, IMC1210ER1R8K, or IMC1210SY1R8K. Bulk packaging is available for IMC1210BN1R8K and IMC1210EB1R8K. Bourns CM322522 variants are supplied in tape & reel format.

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