ELJ-RF4N7DFB Equivalent & Substitute Parts

Part Overview

The ELJ-RF4N7DFB is a 4.7 nH unshielded multilayer inductor manufactured by Panasonic Electronic Components in the RF series. This surface mount component is rated for 360 mA maximum current with 170mOhm DC resistance in a 0402 (1005 Metric) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring this inductance value and package form factor.

Substiute Parts

ELJ-RF4N7DFB

Panasonic Electronic ComponentsIn Stock: 777ELJ-RF4N7DFB Datasheet

Current PartRFQ

MLG1005S4N7ST000

TDK CorporationIn Stock: 55155MLG1005S4N7ST000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ELJ-RF4N7DFB is determined by the following critical parameters:

• Inductance Value: Must be 4.7 nH with ±0.3nH tolerance
• Package Form Factor: Must be 0402 (1005 Metric) surface mount
• Shielding Configuration: Must be unshielded multilayer construction
• Physical Dimensions: Must match 0.039" L x 0.020" W (1.00mm x 0.50mm) with maximum seated height of 0.022" (0.55mm)

The MLG1005S4N7ST000 from TDK Corporation meets all substitution criteria. While this part exceeds the original specifications in current rating (700 mA vs 360 mA) and operating temperature range (-55°C ~ 125°C vs -20°C ~ 85°C), these represent performance enhancements that do not compromise compatibility in applications designed for the ELJ-RF4N7DFB.

Parameter Comparison

Engineering Selection Recommendations

The MLG1005S4N7ST000 is the direct substitute for the obsolete ELJ-RF4N7DFB. Selection of this substitute is supported by:

• Product Status: The TDK part is active and in production, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: Both parts share identical REACH and ECCN classifications, maintaining compliance requirements
• RoHS Compliance: The MLG1005S4N7ST000 is ROHS3 compliant, meeting current environmental standards
• Electrical Equivalence: Identical inductance value and tolerance ensure functional compatibility in RF circuit applications
• Physical Compatibility: Matching package dimensions and mounting type enable direct PCB layout substitution without redesign
• Performance Enhancement: The substitute part provides superior current rating and extended operating temperature range, offering design margin improvement

Frequently Asked Questions (FAQ)

Q: Can the MLG1005S4N7ST000 be used as a direct replacement for the ELJ-RF4N7DFB?

A: Yes. Both parts share identical inductance values (4.7 nH ±0.3nH), package form factors (0402 / 1005 Metric), physical dimensions, and unshielded multilayer construction. The TDK substitute is electrically and mechanically compatible for direct PCB substitution.

Q: What are the differences between these two parts?

A: The MLG1005S4N7ST000 exceeds the ELJ-RF4N7DFB in current rating (700 mA vs 360 mA), operating temperature range (-55°C ~ 125°C vs -20°C ~ 85°C), and product status (active vs obsolete). DC resistance is higher at 250mOhm maximum compared to 170mOhm maximum. Self-resonant frequency is slightly lower at 4.5GHz versus 4.8GHz.

Q: Are there packaging differences between these parts?

A: The ELJ-RF4N7DFB is supplied in standard packaging, while the MLG1005S4N7ST000 is supplied in Tape & Reel (TR) format. Both maintain identical component dimensions and surface mount compatibility. Tape & Reel packaging is standard for high-volume production applications.

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

A: The 80mOhm increase in maximum DC resistance (from 170mOhm to 250mOhm) must be evaluated within the specific application context. For RF applications operating at 100MHz and above, this resistance difference may have minimal impact on circuit performance. Applications with strict loss requirements should perform circuit simulation to confirm acceptable performance margins.

Q: What is the moisture sensitivity level for both parts?

A: Both the ELJ-RF4N7DFB and MLG1005S4N7ST000 are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage practices are sufficient without special moisture control measures.