The **CV201210-R39K** is a surface-mount (SMD) multilayer chip inductor. It is a passive electronic component commonly used for high-frequency applications, signal conditioning, and noise suppression in compact electronic devices. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its physical and electrical characteristics: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.39 µH (Microhenries) | Represented by "R39" | | **Tolerance** | ±10% | Represented by the "K" suffix | | **Case Size** | 0805 (Metric 2012) | 2.0mm x 1.25mm x 1.0mm | | **Core Material** | Ferrite | High magnetic permeability | | **Max DC Current** | ~200mA to 300mA | Varies slightly by manufacturer (e.g., Bourns) | | **DC Resistance (DCR)** | ~0.45Ω (Max) | Resistance to direct current | | **Self-Resonant Freq.** | ~150 MHz | The limit for inductive behavior | --- ## 2. Key Features * **Multilayer Structure:** Unlike wire-wound inductors, these are made by layering ferrite paste and conductive electrode paste, resulting in a monolithic structure that is highly reliable and compact. * **Magnetic Shielding:** The closed magnetic circuit minimizes crosstalk and electromagnetic interference (EMI) with surrounding components. * **High Q Factor:** Offers excellent efficiency at high frequencies. * **Solderability:** Features nickel-barrier terminations to prevent leaching during reflow soldering. --- ## 3. Common Applications This specific inductor is typically found in: 1. **Mobile Electronics:** Smartphones, tablets, and wearables where space is limited. 2. **RF Circuits:** Used in impedance matching and resonance circuits for Bluetooth, Wi-Fi, and cellular modules. 3. **Signal Filtering:** Low-pass filtering to remove high-frequency noise from data lines. 4. **Local Decoupling:** Managing power stability for low-power ICs. --- ## 4. Part Number Breakdown The code `CV201210-R39K` can be decoded as follows: * **CV:** Series identifier (Multilayer Chip Inductor). * **201210:** Dimensions (Length 2.0mm, Width 1.2mm, Thickness 1.0mm). * **R39:** The value. "R" acts as the decimal point (0.39). * **K:** Tolerance code (K = ±10%, M = ±20%, J = ±5%).