ELJ-PC120KF Equivalent & Substitute Parts

Part Overview

The ELJ-PC120KF is a 12 µH unshielded wirewound inductor manufactured by Panasonic Electronic Components, rated for 195 mA maximum current with 2.7Ω DC resistance. This component is classified as obsolete, making substitute parts necessary for new procurement and ongoing production support. The part is packaged in 1008 (2520 Metric) surface mount format with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Inductance	12 µH
Inductance Tolerance	±10%
Current Rating	195 mA
DC Resistance (DCR)	2.7Ω Max
Shielding	Unshielded
Package / Case	1008 (2520 Metric)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 85°C
Frequency - Self Resonant	25 MHz
Q @ Freq	20 @ 2.52MHz

Substitute Part Grouping Explanation

Substitution for the ELJ-PC120KF is based on the following critical parameters:

Inductance Value: 12 µH (primary functional requirement)
Package / Case: 1008 (2520 Metric) (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Shielding: Unshielded (electromagnetic environment compatibility)

The substitute parts NLV25T-120J-EF and NLV25T-120J-PF, both manufactured by TDK Corporation, meet these core substitution criteria. Both are 12 µH unshielded inductors in 1008 (2520 Metric) surface mount packages. Differences in current rating, DC resistance, and tolerance are within acceptable engineering margins for equivalent functionality in most applications.

Parameter Comparison

Parameter	ELJ-PC120KF (Panasonic)	NLV25T-120J-EF (TDK)	NLV25T-120J-PF (TDK)
Inductance	12 µH	12 µH	12 µH
Inductance Tolerance	±10%	±5%	±5%
Current Rating (Amps)	195 mA	150 mA	150 mA
DC Resistance (DCR)	2.7Ω Max	3.8Ω Max	3.8Ω Max
Shielding	Unshielded	Unshielded	Unshielded
Type	Wirewound	Drum Core, Wirewound	Drum Core, Wirewound
Package / Case	1008 (2520 Metric)	1008 (2520 Metric)	1008 (2520 Metric)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-20°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 105°C
Frequency - Self Resonant	25 MHz	30 MHz	30 MHz
Q @ Freq	20 @ 2.52MHz	25 @ 2.52MHz	25 @ 2.52MHz
Product Status	Obsolete	Active	Not For New Designs
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

NLV25T-120J-EF is the primary substitute for new designs. This part carries Active product status, ROHS3 compliance, and REACH compliance, making it suitable for current production and future applications. The tighter inductance tolerance (±5% vs ±10%) provides improved consistency.

NLV25T-120J-PF is available as a secondary option with significantly higher inventory (53,291 pcs vs 2,100 pcs). However, this part is classified as Not For New Designs, limiting its application to legacy system support or existing production runs where component continuity is required.

Both TDK substitutes operate across a wider temperature range (-40°C ~ 105°C vs -20°C ~ 85°C) and feature higher self-resonant frequency (30 MHz vs 25 MHz). The reduced current rating (150 mA vs 195 mA) and increased DC resistance (3.8Ω vs 2.7Ω) must be evaluated against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can NLV25T-120J-EF and NLV25T-120J-PF be used interchangeably with ELJ-PC120KF?

A: Both TDK parts share identical electrical specifications (12 µH inductance, 150 mA current rating, 3.8Ω DCR) and the same 1008 (2520 Metric) package. They are mechanically and electrically compatible substitutes. Selection between them depends on product status requirements and inventory availability.

Q: What are the key differences between the substitute parts?

A: NLV25T-120J-EF is Active status with full compliance certifications (ROHS3, REACH). NLV25T-120J-PF is Not For New Designs but offers substantially higher stock availability. Both parts are functionally equivalent.

Q: Does the reduced current rating (150 mA vs 195 mA) affect compatibility?

A: Circuit current requirements must not exceed 150 mA when using TDK substitutes. If the original design operates above 150 mA, these parts are not suitable without circuit redesign.

Q: How do the DC resistance differences impact circuit performance?

A: The increase from 2.7Ω to 3.8Ω results in higher power dissipation and voltage drop across the inductor. Applications sensitive to resistive losses require circuit analysis to confirm acceptability.

Q: Are the package dimensions identical?

A: Yes. All three parts use 1008 (2520 Metric) packaging with identical footprints (0.098" L x 0.079" W / 2.50mm x 2.00mm). Height differences are minimal (1.80mm vs 1.90mm maximum seated height).

Q: Which substitute should be selected for new product designs?

A: NLV25T-120J-EF is the appropriate choice for new designs due to Active product status and full compliance certifications.

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