ELJ-FAR68KF2 Equivalent & Substitute Parts

Part Overview

The Panasonic ELJ-FAR68KF2 is a 680 nH unshielded wirewound inductor rated for 260 mA with 550mOhm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The part operates across -20°C to 85°C with ±10% inductance tolerance and demonstrates a Q factor of 25 at 25.2 MHz with a self-resonant frequency of 135 MHz.

Key Parameters

Parameter	Value	Unit
Inductance	680	nH
Inductance Tolerance	±10%	—
Current Rating	260	mA
DC Resistance (DCR)	550	mOhm Max
Q Factor @ Test Frequency	25 @ 25.2 MHz	—
Self-Resonant Frequency	135	MHz
Operating Temperature Range	-20 to 85	°C
Package / Case	1210 (3225 Metric)	—
Mounting Type	Surface Mount	—
Shielding	Unshielded	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-FAR68KF2 is determined by strict alignment with the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance value: 680 nH ±10%
Package / Case: 1210 (3225 Metric) surface mount
Current Rating: minimum 260 mA
DC Resistance: maximum 550 mOhm
Shielding: Unshielded
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Substitute Categories:

Direct Equivalents — Parts meeting all primary criteria with identical or superior electrical performance:

IMC1210EBR68K, IMC1210ERR68K, IMC1210ESR68K (Vishay Dale)
CM322522-R68KL (Bourns Inc.)

Compatible Alternatives — Parts meeting primary criteria with enhanced current rating or improved thermal range:

1210R-681K, 1210-681K (API Delevan Inc.)
IMC1210BNR68K, IMC1210SYR68K, IMC1210SZR68K (Vishay Dale)

Functional Equivalent with Package Variation — Part meeting electrical criteria but with non-standard package designation:

B82422A3681K100 (EPCOS - TDK Electronics) — Note: 2-SMD J-Lead package with reduced current rating of 145 mA; suitable only for applications with lower current demands

Parameter Comparison

Manufacturer	Part Number	Inductance (nH)	Tolerance	Current Rating (mA)	DCR Max (mOhm)	Q @ Freq	SRF (MHz)	Temp Range (°C)	Package	Product Status	RoHS Status
Panasonic	ELJ-FAR68KF2	680	±10%	260	550	25 @ 25.2 MHz	135	-20 to 85	1210 (3225 Metric)	Obsolete	—
API Delevan Inc.	1210R-681K	680	±10%	588	600	30 @ 25 MHz	160	-55 to 125	1210 (3225 Metric)	Active	ROHS3 Compliant
EPCOS - TDK Electronics	B82422A3681K100	680	±10%	145	2400	22 @ 30 MHz	280	-55 to 125	2-SMD, J-Lead	Active	ROHS3 Compliant
Bourns Inc.	CM322522-R68KL	680	±10%	260	550	25 @ 25.2 MHz	135	-40 to 125	Nonstandard	Active	ROHS3 Compliant
Vishay Dale	IMC1210BNR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	RoHS non-compliant
Vishay Dale	IMC1210EBR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	ROHS3 Compliant
Vishay Dale	IMC1210ERR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	ROHS3 Compliant
Vishay Dale	IMC1210ESR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	ROHS3 Compliant
Vishay Dale	IMC1210SYR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	RoHS non-compliant
Vishay Dale	IMC1210SZR68K	680	±10%	450	600	30 @ 25.2 MHz	160	-55 to 125	1210 (3225 Metric)	Active	RoHS non-compliant
API Delevan Inc.	1210-681K	680	±10%	588	600	30 @ 25 MHz	160	-55 to 125	1210 (3225 Metric)	Active	RoHS non-compliant

Engineering Selection Recommendations

Preferred Substitutes for RoHS3 Compliance:

IMC1210EBR68K, IMC1210ERR68K, and IMC1210ESR68K (Vishay Dale) are direct functional equivalents with ROHS3 compliance. These parts maintain the 680 nH inductance, 1210 package footprint, and unshielded configuration. Current rating increases to 450 mA, exceeding the original 260 mA specification. Operating temperature range extends to -55°C to 125°C. All three parts are active products with identical electrical performance; selection among them depends on packaging preference (Bulk or Tape & Reel).

Alternative with Enhanced Thermal Range:

1210R-681K (API Delevan Inc.) provides ROHS3 compliance with extended operating temperature (-55°C to 125°C) and elevated current rating (588 mA). DCR increases to 600 mOhm, remaining within acceptable tolerance for most applications. Self-resonant frequency improves to 160 MHz.

For Non-RoHS Applications:

IMC1210BNR68K, IMC1210SYR68K, and IMC1210SZR68K (Vishay Dale) and 1210-681K (API Delevan Inc.) are available for designs not requiring RoHS3 certification. These maintain 680 nH inductance with enhanced current ratings and extended temperature ranges.

Not Recommended for Direct Substitution:

B82422A3681K100 (EPCOS - TDK Electronics) exhibits significantly reduced current rating (145 mA versus 260 mA) and substantially elevated DCR (2400 mOhm versus 550 mOhm). Package configuration differs (2-SMD J-Lead versus 1210). This part is suitable only for applications with substantially lower current requirements.

Frequently Asked Questions (FAQ)

Q: Can IMC1210EBR68K directly replace ELJ-FAR68KF2 in existing designs?

A: Yes. Both parts share identical inductance (680 nH), tolerance (±10%), DC resistance (550 mOhm max), and 1210 package footprint. The IMC1210EBR68K provides higher current rating (450 mA versus 260 mA) and extended temperature range (-55°C to 125°C versus -20°C to 85°C), making it functionally superior. ROHS3 compliance adds regulatory advantage.

Q: What is the difference between IMC1210EBR68K, IMC1210ERR68K, and IMC1210ESR68K?

A: These three Vishay Dale parts are electrically identical. Differences exist only in packaging: EBR indicates Bulk packaging, ERR and ESR indicate Tape & Reel configurations. Selection depends on assembly process requirements and inventory management preferences.

Q: Why does B82422A3681K100 have such high DC resistance?

A: B82422A3681K100 uses a ceramic drum core construction with reduced wire gauge to achieve the 145 mA current rating. This design trade-off results in 2400 mOhm DCR, approximately 4.4 times higher than the original part. This part is not suitable for applications requiring the original 260 mA current specification.

Q: Are all substitute parts available in the same package size?

A: Most substitutes use the standard 1210 (3225 Metric) package. CM322522-R68KL is designated as nonstandard package but maintains 3.20mm x 2.50mm footprint dimensions. B82422A3681K100 uses 2-SMD J-Lead configuration and is not mechanically compatible with 1210 footprints.

Q: Which substitute offers the best thermal performance?

A: 1210R-681K and 1210-681K (API Delevan Inc.) and all active Vishay Dale IMC-1210 series parts operate across -55°C to 125°C, providing the widest temperature range. The original ELJ-FAR68KF2 operates only to 85°C maximum.

Q: Do all substitutes meet RoHS3 requirements?

A: No. IMC1210EBR68K, IMC1210ERR68K, IMC1210ESR68K (Vishay Dale), 1210R-681K (API Delevan Inc.), and B82422A3681K100 (EPCOS - TDK Electronics) are ROHS3 compliant. IMC1210BNR68K, IMC1210SYR68K, IMC1210SZR68K (Vishay Dale), and 1210-681K (API Delevan Inc.) are RoHS non-compliant. Design requirements determine compliance necessity.

Q: What is the significance of the Q factor difference between parts?

A: Q factor indicates inductor efficiency at the test frequency. Higher Q values (30 versus 25) indicate lower losses. API Delevan and Vishay Dale parts demonstrate Q of 30 at their respective test frequencies, compared to Q of 25 for the original part. This represents improved performance in RF and high-frequency applications.

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