ELJ-QF3N0DF Equivalent & Substitute Parts

Part Overview

The ELJ-QF3N0DF is a 3 nH unshielded multilayer ceramic inductor manufactured by Panasonic Electronic Components in the 0402 (1005 Metric) surface mount package. This component is rated for 400 mA maximum current with 120 mOhm maximum DC resistance and operates across the temperature range of -40°C to 85°C. The product is currently obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Inductance	3 nH
Inductance Tolerance	±0.3 nH
Current Rating	400 mA
DC Resistance (Max)	120 mOhm
Shielding	Unshielded
Core Material	Ceramic
Package / Case	0402 (1005 Metric)
Operating Temperature Range	-40°C to 85°C
Frequency - Self Resonant	5.5 GHz
Q @ 100 MHz	10
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-QF3N0DF is determined by the following critical parameters:

Inductance value and tolerance (3 nH ±0.3 nH)
Package / Case format (0402 / 1005 Metric)
Unshielded ceramic multilayer construction
Surface mount mounting type
Physical dimensions (0.039" L x 0.020" W, 0.022" max height)

The MLG1005S3N0ST000 from TDK Corporation meets all substitution criteria. While this substitute exhibits higher current rating (800 mA vs. 400 mA) and higher maximum DC resistance (200 mOhm vs. 120 mOhm), these parameters represent relaxed constraints that do not prevent substitution in applications designed for the original component. The substitute maintains identical inductance specification, tolerance, package format, and core material composition.

Parameter Comparison

Parameter	ELJ-QF3N0DF (Panasonic)	MLG1005S3N0ST000 (TDK)
Inductance	3 nH	3 nH
Inductance Tolerance	±0.3 nH	±0.3 nH
Current Rating (Amps)	400 mA	800 mA
DC Resistance (Max)	120 mOhm	200 mOhm
Shielding	Unshielded	Unshielded
Core Material	Ceramic	Ceramic, Non-Magnetic
Package / Case	0402 (1005 Metric)	0402 (1005 Metric)
Size / Dimension	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.039" L x 0.020" W (1.00mm x 0.50mm)
Height - Seated (Max)	0.022" (0.55mm)	0.022" (0.55mm)
Operating Temperature Range	-40°C to 85°C	-55°C to 125°C
Frequency - Self Resonant	5.5 GHz	5.5 GHz
Q @ 100 MHz	10	7
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99

Engineering Selection Recommendations

The MLG1005S3N0ST000 is the qualified substitute for the obsolete ELJ-QF3N0DF. Selection of this substitute is supported by the following factors:

Active product status ensures ongoing availability and supply chain continuity
Identical inductance specification (3 nH) and tolerance (±0.3 nH) guarantee electrical equivalence in the primary circuit function
Identical package format and physical dimensions enable direct PCB layout compatibility without redesign
ROHS3 compliance of the substitute provides enhanced regulatory alignment compared to the original component
Extended operating temperature range (-55°C to 125°C) provides broader environmental coverage than the original specification (-40°C to 85°C)
Identical self-resonant frequency (5.5 GHz) and MSL rating (1) maintain high-frequency performance characteristics
Both components carry identical REACH and ECCN classifications, ensuring consistent export and regulatory compliance

Frequently Asked Questions (FAQ)

Q: Can the MLG1005S3N0ST000 be used as a direct replacement for the ELJ-QF3N0DF?

A: Yes. Both components share identical inductance value (3 nH), tolerance (±0.3 nH), package format (0402 / 1005 Metric), physical dimensions, and core material composition. The substitute is electrically and mechanically compatible for direct PCB substitution.

Q: What are the differences between these two inductors?

A: The MLG1005S3N0ST000 features higher current rating (800 mA vs. 400 mA), higher maximum DC resistance (200 mOhm vs. 120 mOhm), lower Q factor at 100 MHz (7 vs. 10), extended operating temperature range (-55°C to 125°C vs. -40°C to 85°C), and active product status versus obsolete status. The substitute also carries ROHS3 compliance.

Q: Does the higher DC resistance of the substitute affect circuit performance?

A: The higher DC resistance (200 mOhm maximum vs. 120 mOhm maximum) represents a relaxed specification. Applications designed for the original component with 120 mOhm maximum resistance will operate within acceptable parameters with the substitute. Circuit analysis should confirm that the additional resistance does not exceed design margins for specific applications.

Q: Are there packaging differences between these components?

A: Both components are supplied in 0402 (1005 Metric) surface mount packages with identical physical dimensions (0.039" L x 0.020" W, 0.022" maximum height). The MLG1005S3N0ST000 is supplied in Tape & Reel (TR) packaging, while the original ELJ-QF3N0DF packaging format is not specified in available data.

Q: What is the impact of the lower Q factor in the substitute?

A: The MLG1005S3N0ST000 exhibits a Q factor of 7 at 100 MHz compared to 10 for the original component. This represents a lower quality factor, which may result in slightly increased losses in high-frequency applications. Circuit performance should be evaluated for applications where Q factor is a critical design parameter.

Q: Are regulatory and compliance certifications equivalent?

A: Both components carry identical REACH Unaffected status and EAR99 ECCN classification. The substitute provides enhanced compliance through ROHS3 certification. Both components maintain MSL rating of 1 (Unlimited) and identical HTSUS classification (8504.50.8000).

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