ELJ-RF4N3DFB Equivalent & Substitute Parts

Part Overview

The ELJ-RF4N3DFB is a 4.3 nH unshielded multilayer inductor manufactured by Panasonic Electronic Components in the 0402 (1005 Metric) surface mount package. This component is designed for high-frequency applications requiring low inductance values with controlled DC resistance characteristics. The part is currently listed as obsolete, making identification of equivalent substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

ELJ-RF4N3DFB

Panasonic Electronic ComponentsIn Stock: 760ELJ-RF4N3DFB Datasheet

Current PartRFQ

MLG1005S4N3STD25

TDK CorporationIn Stock: 24842MLG1005S4N3STD25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELJ-RF4N3DFB is determined by the following critical parameters:

• Inductance Value: 4.3 nH with ±0.3 nH tolerance
• Package / Case: 0402 (1005 Metric) surface mount
• Shielding Type: Unshielded multilayer construction
• Physical Dimensions: 0.039" L x 0.020" W (1.00 mm x 0.50 mm)
• Mounting Compatibility: Surface mount technology

The substitute part MLG1005S4N3STD25 from TDK Corporation meets these core substitution criteria. Both components share identical inductance specifications, package geometry, and unshielded multilayer construction. Differences in current rating, DC resistance, and operating temperature range represent performance enhancements in the substitute part and do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

The MLG1005S4N3STD25 is the direct substitute for the obsolete ELJ-RF4N3DFB. Selection of this substitute is supported by:

• Identical Electrical Specifications: Both components provide 4.3 nH inductance with ±0.3 nH tolerance and matching Q factor at 100 MHz
• Package Compatibility: Identical 0402 (1005 Metric) surface mount package with matching physical dimensions and height
• Active Product Status: The TDK substitute is currently in active production with established supply chain availability
• Enhanced Performance Margins: The substitute offers higher current rating (700 mA vs. 360 mA) and extended operating temperature range (-55°C ~ 125°C vs. -20°C ~ 85°C)
• Compliance Certifications: The substitute carries AEC-Q200 automotive qualification and ROHS3 compliance

Frequently Asked Questions (FAQ)

Q: Can MLG1005S4N3STD25 be used as a direct replacement for ELJ-RF4N3DFB?

A: Yes. Both components share identical inductance values (4.3 nH ±0.3 nH), package geometry (0402 / 1005 Metric), and unshielded multilayer construction. The substitute is electrically and mechanically compatible for direct PCB substitution.

Q: What are the differences between these two inductors?

A: The primary differences are current rating (700 mA vs. 360 mA), DC resistance (200 mOhm Max vs. 160 mOhm Max), self-resonant frequency (4.5 GHz vs. 5 GHz), and operating temperature range (-55°C ~ 125°C vs. -20°C ~ 85°C). The substitute provides enhanced performance specifications.

Q: Are the physical dimensions identical?

A: Yes. Both components measure 0.039" L x 0.020" W (1.00 mm x 0.50 mm) with a maximum seated height of 0.022" (0.55 mm). They are fully compatible for existing PCB layouts.

Q: What is the packaging format for the substitute part?

A: The MLG1005S4N3STD25 is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount component distribution.

Q: Does the substitute meet automotive standards?

A: Yes. The MLG1005S4N3STD25 carries AEC-Q200 qualification, indicating suitability for automotive applications.