ELJ-FA151KF Equivalent & Substitute Parts

Part Overview

The Panasonic ELJ-FA151KF is a 150 µH unshielded wirewound inductor rated for 50 mA with 15Ohm maximum DC resistance in a 1210 (3225 Metric) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Substitute parts must maintain the core electrical specifications: 150 µH inductance at ±10% tolerance, 50 mA current rating, and 15Ohm maximum DC resistance, while accommodating variations in core material, package configuration, and operating temperature ranges.

Key Parameters

Parameter	ELJ-FA151KF
Inductance	150 µH
Inductance Tolerance	±10%
Current Rating	50 mA
DC Resistance (DCR)	15Ohm Max
Q @ Frequency	20 @ 796kHz
Self Resonant Frequency	8MHz
Package / Case	1210 (3225 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Shielding	Unshielded
Type	Wirewound

Substitute Part Grouping Explanation

Substitution for the ELJ-FA151KF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Inductance: 150 µH (fixed requirement)
Inductance Tolerance: ±10% or tighter
Current Rating: 50 mA minimum
DC Resistance: 15Ohm maximum
Q @ 796kHz: 20 or higher
Self Resonant Frequency: 8MHz or higher
Package / Case: 1210 (3225 Metric) or equivalent footprint
Mounting Type: Surface Mount
Shielding: Unshielded

Acceptable Variations:

Core Material: Ferrite or wirewound construction acceptable
Operating Temperature Range: May exceed the original -20°C ~ 85°C range
Product Status: Active or Not For New Designs acceptable; Obsolete status not preferred
RoHS Compliance: ROHS3 Compliant preferred but not mandatory for substitution

Parts meeting all primary criteria are classified as direct substitutes. Parts exceeding current rating or DCR specifications while maintaining all other parameters are classified as upgraded substitutes with enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Inductance	Tolerance	Current Rating (mA)	DCR (Ohm Max)	Q @ 796kHz	SRF (MHz)	Package	Operating Temp	Product Status
ELJ-FA151KF	Panasonic	150 µH	±10%	50	15	20	8	1210	-20°C ~ 85°C	Obsolete
CM322522-151JL	Bourns Inc.	150 µH	±5%	50	15	20	8	Nonstandard	-40°C ~ 125°C	Active
CM322522-151KL	Bourns Inc.	150 µH	±10%	50	15	20	8	Nonstandard	-40°C ~ 125°C	Active
PM1210-151J-RC	Bourns Inc.	150 µH	±5%	50	15	20	8	1210	-40°C ~ 125°C	Active
IMC1210BN151K	Vishay Dale	150 µH	±10%	65	15	15	6.5	1210	-55°C ~ 125°C	Active
IMC1210EB151K	Vishay Dale	150 µH	±10%	65	15	15	6.5	1210	-55°C ~ 125°C	Active
IMC1210ER151K	Vishay Dale	150 µH	±10%	65	15	15	6.5	1210	-55°C ~ 125°C	Active
IMC1210SY151K	Vishay Dale	150 µH	±10%	65	15	15	6.5	1210	-55°C ~ 125°C	Active
NLCV32T-151K-PF	TDK Corporation	150 µH	±10%	100	7.93	20	8	1210	-40°C ~ 105°C	Not For New Designs
NLCV32T-151K-EF	TDK Corporation	150 µH	±10%	100	7.93	20	8	1210	-40°C ~ 105°C	Active
B82422H1154K000	EPCOS - TDK Electronics	150 µH	±10%	120	7.5	20	6	2-SMD, J-Lead	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Substitutes (Electrical and Mechanical Equivalence):

PM1210-151J-RC (Bourns Inc.) is the primary direct substitute. It maintains identical electrical specifications (150 µH, ±5% tolerance, 50 mA, 15Ohm DCR, 20 Q @ 796kHz, 8MHz SRF) in the standard 1210 package with active product status and ROHS3 compliance. Operating temperature range extends to -40°C ~ 125°C, providing improved thermal margin.

CM322522-151KL (Bourns Inc.) is an electrical equivalent with ±10% tolerance matching the original specification. It maintains 50 mA current rating and 15Ohm DCR in a nonstandard package configuration. Active product status and ROHS3 compliance are confirmed.

CM322522-151JL (Bourns Inc.) offers tighter ±5% inductance tolerance with identical electrical performance. Nonstandard package configuration requires mechanical verification for PCB compatibility.

Upgraded Substitutes (Enhanced Performance Margins):

NLCV32T-151K-EF (TDK Corporation) provides 100 mA current rating and 7.93Ohm DCR, doubling the current capacity while reducing DC resistance. Electrical specifications (150 µH, ±10%, 20 Q @ 796kHz, 8MHz SRF) remain equivalent. Standard 1210 package with active product status and ROHS3 compliance.

IMC1210EB151K, IMC1210ER151K, IMC1210SY151K (Vishay Dale) offer 65 mA current rating with 15Ohm DCR in standard 1210 packages. These variants provide 30% current margin improvement. Active product status with ROHS3 compliance (EB and ER variants). Operating temperature range -55°C ~ 125°C exceeds original specification.

B82422H1154K000 (EPCOS - TDK Electronics) provides 120 mA current rating and 7.5Ohm DCR with extended operating temperature to -55°C ~ 150°C. Package configuration is 2-SMD, J-Lead; mechanical compatibility requires verification. AEC-Q200 rating and ROHS3 compliance confirmed.

Not Recommended for New Designs:

NLCV32T-151K-PF (TDK Corporation) carries "Not For New Designs" status despite meeting electrical specifications. NLCV32T-151K-EF is the active replacement.

Frequently Asked Questions (FAQ)

Q: Can CM322522-151KL replace ELJ-FA151KF directly?

A: CM322522-151KL meets all electrical substitution criteria: 150 µH inductance, ±10% tolerance, 50 mA current rating, and 15Ohm maximum DCR. However, the nonstandard package configuration requires mechanical verification against the original 1210 footprint to confirm PCB compatibility.

Q: What is the difference between PM1210-151J-RC and CM322522-151KL?

A: PM1210-151J-RC uses the standard 1210 (3225 Metric) package, while CM322522-151KL uses a nonstandard package. Electrically, PM1210-151J-RC has ±5% tolerance versus ±10% for CM322522-151KL. Both maintain 50 mA current rating and 15Ohm DCR. Package selection depends on PCB layout requirements.

Q: Can I use NLCV32T-151K-EF as a substitute?

A: NLCV32T-151K-EF is electrically compatible with enhanced performance: 100 mA current rating (versus 50 mA) and 7.93Ohm DCR (versus 15Ohm). Inductance, tolerance, Q factor, and self-resonant frequency remain equivalent. The standard 1210 package ensures mechanical compatibility. This is an upgraded substitute suitable for applications requiring improved current handling.

Q: What are the key differences between Vishay Dale IMC1210 variants?

A: IMC1210BN151K, IMC1210EB151K, IMC1210ER151K, and IMC1210SY151K are electrically identical: 150 µH, ±10%, 65 mA, 15Ohm DCR. Differences are in packaging (Bulk versus Tape & Reel) and RoHS compliance status. IMC1210EB151K and IMC1210ER151K are ROHS3 compliant; IMC1210BN151K and IMC1210SY151K are RoHS non-compliant. All use standard 1210 packages.

Q: Why does B82422H1154K000 have a different package designation?

A: B82422H1154K000 uses a 2-SMD, J-Lead package configuration rather than the standard 1210 format. While electrical specifications are compatible, the physical package footprint differs. Mechanical compatibility with the original PCB layout must be verified before selection.

Q: Is NLCV32T-151K-PF still available for use?

A: NLCV32T-151K-PF carries "Not For New Designs" status. NLCV32T-151K-EF is the active equivalent with identical electrical specifications and should be selected for new applications. NLCV32T-151K-PF remains available in inventory but is not recommended for ongoing production.

Q: What operating temperature range should I select?

A: The original ELJ-FA151KF operates from -20°C ~ 85°C. Most substitutes extend this range to -40°C ~ 125°C or wider. Selection depends on application thermal requirements. If the original temperature range is sufficient, any substitute meeting this criterion is acceptable. Extended temperature ranges provide additional design margin without electrical trade-offs.

Q: Are all substitutes RoHS compliant?

A: Most active substitutes are ROHS3 compliant. IMC1210BN151K and IMC1210SY151K are RoHS non-compliant. B82422H1154K000 is ROHS3 compliant with AEC-Q200 rating. Compliance requirements depend on application and regional regulations; verify RoHS status against design specifications.

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