ELJ-QF4N7DF Equivalent & Substitute Parts

Part Overview

The ELJ-QF4N7DF is a 4.7 nH unshielded multilayer ceramic inductor manufactured by Panasonic Electronic Components. This surface mount component is rated for 360 mA continuous current with a maximum DC resistance of 170mOhm and operates across the temperature range of -40°C to 85°C. The part is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement.

Substiute Parts

ELJ-QF4N7DF

Panasonic Electronic ComponentsIn Stock: 802ELJ-QF4N7DF Datasheet

Current PartRFQ

MLG1005S4N7ST000

TDK CorporationIn Stock: 55155MLG1005S4N7ST000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ELJ-QF4N7DF is determined by the following critical parameters:

• Inductance Value: Must be 4.7 nH with tolerance of ±0.3nH
• Package / Case: Must be 0402 (1005 Metric) for mechanical and electrical compatibility
• Shielding Type: Must be unshielded to match circuit design requirements
• Core Material: Must be ceramic to maintain electrical characteristics
• Mounting Type: Must be surface mount

The substitute part MLG1005S4N7ST000 meets all these core requirements. While the substitute exhibits higher current rating (700 mA vs 360 mA), higher DC resistance (250mOhm vs 170mOhm), and extended operating temperature range (-55°C ~ 125°C vs -40°C ~ 85°C), these parameters remain within acceptable substitution criteria as they do not reduce the functional capability of the original design.

Parameter Comparison

Engineering Selection Recommendations

The MLG1005S4N7ST000 from TDK Corporation is a direct functional substitute for the obsolete ELJ-QF4N7DF. The substitute maintains identical inductance value and tolerance, identical package dimensions, and identical core material composition. The substitute part carries active product status with ROHS3 compliance certification, ensuring long-term availability and regulatory alignment.

The higher current rating and extended operating temperature range of the substitute provide additional design margin without introducing incompatibility. The increased DC resistance specification (250mOhm vs 170mOhm) must be evaluated within the context of the specific circuit application to confirm acceptable performance.

Frequently Asked Questions (FAQ)

Q: Can MLG1005S4N7ST000 be used as a direct replacement for ELJ-QF4N7DF?

A: Yes. Both components share identical inductance value (4.7 nH), inductance tolerance (±0.3nH), package dimensions (0402 / 1005 Metric), core material (ceramic), and mounting type (surface mount). Mechanical and electrical compatibility is confirmed.

Q: What is the significance of the higher current rating on the substitute part?

A: The MLG1005S4N7ST000 is rated for 700 mA continuous current compared to 360 mA for the ELJ-QF4N7DF. This higher rating does not create incompatibility; it indicates the substitute can handle equal or greater current levels without saturation. Circuit designs operating at or below 360 mA will function identically with either component.

Q: Does the increased DC resistance affect circuit performance?

A: The substitute part specifies 250mOhm maximum DC resistance versus 170mOhm for the original. The 80mOhm difference must be evaluated within the specific circuit application. For high-frequency RF applications or precision impedance matching circuits, this difference may require circuit analysis. For general-purpose filtering and coupling applications, the difference is typically negligible.

Q: Are there packaging differences between these components?

A: No. Both components use identical 0402 (1005 Metric) surface mount packaging with matching footprint dimensions (1.00mm L x 0.50mm W) and maximum seated height (0.55mm). PCB layout and assembly processes require no modification.

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

A: The ELJ-QF4N7DF specifies 4.8GHz self-resonant frequency while the MLG1005S4N7ST000 specifies 4.5GHz. Both values remain well above typical operating frequencies for general-purpose inductor applications. For circuits operating near or above 4.5GHz, the specific self-resonant frequency should be confirmed against circuit requirements.