## Technical Overview of ELJNDR10DF The **ELJNDR10DF** is a high-frequency wire-wound chip inductor manufactured by **Panasonic**. It belongs to the **ND series**, which is specifically designed for high-frequency circuits such as mobile communications and RF modules. --- ### 1. Key Technical Specifications The following table outlines the fundamental electronic parameters of the ELJNDR10DF: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.10 µH (100 nH) | | **Inductance Tolerance** | ±5% (J-grade) | | **DC Resistance (DCR)** | 1.05 Ω (Maximum) | | **Rated Current** | 200 mA | | **Self-Resonant Frequency (SRF)** | 1000 MHz | | **Quality Factor (Q)** | 12 (Minimum at 25.2 MHz) | | **Case Size (EIA/Metric)** | 0805 / 2012 | | **Operating Temperature** | -40°C to +85°C | --- ### 2. Physical Construction and Form Factor The device utilizes a **wire-wound** structure on a ceramic core, which provides superior electrical performance compared to multilayer inductors at high frequencies. * **Size:** 0805 (2.0mm x 1.25mm x 1.2mm). * **Termination:** Lead-free (RoHS compliant) solder electrodes. * **Packaging:** Typically supplied in Embossed Carrier Taping for automated SMT (Surface Mount Technology) assembly. --- ### 3. Core Characteristics #### High Quality (Q) Factor The wire-wound design ensures low losses, resulting in a high Q-factor. This is essential for maintaining signal integrity in filters and matching circuits. #### High Resonant Frequency With an SRF of 1000 MHz, this part is ideal for applications operating in the VHF and UHF bands, as it maintains its inductive properties without becoming capacitive too early. #### Precision The ±5% tolerance allows for tighter control in RF circuit tuning compared to standard 10% or 20% tolerance parts. --- ### 4. Common Applications Due to its high-frequency stability, the ELJNDR10DF is commonly found in: * **RF Matching Networks:** Impedance matching for antennas in cellular phones and Wi-Fi modules. * **Signal Conditioning:** Used in high-speed data transmission lines to filter out noise. * **Oscillators:** Stability in Voltage Controlled Oscillators (VCOs). * **Mobile Communication:** Pagers, cordless phones, and GPS receivers. ---