ELJ-RF2N2DFB Equivalent & Substitute Parts

Part Overview

The ELJ-RF2N2DFB is a 2.2 nH unshielded multilayer inductor manufactured by Panasonic Electronic Components, designed for RF applications requiring low inductance values in compact surface mount packages. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -20°C to 85°C with a maximum DC resistance of 90mOhm and supports current ratings up to 400 mA.

Substiute Parts

ELJ-RF2N2DFB

Panasonic Electronic ComponentsIn Stock: 942ELJ-RF2N2DFB Datasheet

Current PartRFQ

MLG1005S2N2ST000

TDK CorporationIn Stock: 155472MLG1005S2N2ST000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-RF2N2DFB is determined by the following critical parameters:

• Inductance Value: Must match 2.2 nH with tolerance ±0.3nH
• Package / Case: Must be 0402 (1005 Metric) for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount
• Shielding Configuration: Must be Unshielded
• Core Material: Must be Non-Magnetic
• Type: Must be Multilayer

The substitute part MLG1005S2N2ST000 meets all mandatory substitution criteria. While the substitute exhibits higher current rating (900 mA vs 400 mA), higher DC resistance (150mOhm Max vs 90mOhm Max), and extended operating temperature range (-55°C ~ 125°C vs -20°C ~ 85°C), these represent performance enhancements or broader operational capability rather than incompatibilities. The inductance value, tolerance, package, and core configuration remain identical.

Parameter Comparison

Engineering Selection Recommendations

The MLG1005S2N2ST000 from TDK Corporation is a direct functional equivalent for the obsolete ELJ-RF2N2DFB. Selection of this substitute is supported by:

• Active Product Status: The substitute maintains active manufacturing status, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: Both parts share identical REACH and ECCN classifications, maintaining compliance posture across international markets.
• Identical Core Specifications: Inductance value, tolerance, package dimensions, and mounting configuration are identical, enabling direct PCB-level substitution without layout modifications.
• Enhanced Operational Capability: The substitute provides higher current rating capacity (900 mA vs 400 mA) and extended temperature range (-55°C ~ 125°C vs -20°C ~ 85°C), offering design margin for thermal and current stress conditions.
• Moisture Sensitivity: Both parts carry MSL 1 (Unlimited) rating, indicating equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can MLG1005S2N2ST000 be used as a direct replacement for ELJ-RF2N2DFB on existing PCBs?

A: Yes. Both parts share identical package dimensions (0402 / 1005 Metric), footprint, and mounting type (Surface Mount). No PCB layout modifications are required.

Q: What is the significance of the higher DC resistance in the substitute part?

A: The MLG1005S2N2ST000 exhibits 150mOhm Max DCR compared to 90mOhm Max in the original part. This parameter affects resistive losses in the inductor. Circuit designs operating within the original 400 mA current specification will experience acceptable performance with the substitute.

Q: Does the extended operating temperature range of the substitute affect compatibility?

A: No. The substitute's operating range (-55°C ~ 125°C) encompasses the original part's range (-20°C ~ 85°C). This represents expanded capability rather than incompatibility.

Q: Are there differences in Q factor between the two parts?

A: The original part specifies Q of 8 @ 100MHz, while the substitute specifies Q of 7 @ 100MHz. This represents a minor difference in quality factor at the test frequency. Both values are suitable for RF applications in the 2.2 nH inductance class.

Q: What is the difference in self-resonant frequency?

A: The original part has a self-resonant frequency of 6GHz, while the substitute is rated at 7GHz. The higher self-resonant frequency of the substitute provides extended usable frequency range for RF circuit applications.

Q: Are packaging and moisture sensitivity requirements identical?

A: Yes. Both parts are rated MSL 1 (Unlimited) and use identical Tape & Reel or equivalent packaging formats. Storage and handling requirements are equivalent.