The **CS201212-R56K** is a surface-mount electronic component, specifically a **multilayer ferrite chip inductor**. These components are widely used in high-frequency circuits for noise suppression and signal conditioning. --- ### 1. Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.56 µH (R56) | The nominal inductance value. | | **Tolerance** | ±10% (K) | The allowable deviation from the nominal value. | | **Package Size** | 2012 (Metric) / 0805 (Imperial) | Physical dimensions: 2.0 x 1.25 mm. | | **Material** | Ferrite | Multi-layer construction for high-density mounting. | | **DC Resistance (DCR)** | ~0.40 Ω (typical) | Internal resistance of the coil. | | **Rated Current** | ~250 mA | Maximum continuous current allowable. | | **Self-Resonant Freq.** | ~150 MHz | The frequency at which it stops acting as an inductor. | --- ### 2. Part Number Breakdown The nomenclature follows a standard industry format for chip inductors: * **CS**: Series prefix (typically indicating a Multilayer Chip Inductor). * **201212**: Physical dimensions in millimeters ($Length \times Width \times Thickness$). * **R56**: Inductance value code. "R" acts as a decimal point ($0.56$ microhenries). * **K**: Tolerance code ($K = \pm 10\%$). --- ### 3. Key Features & Applications #### Features * **Closed Magnetic Circuit:** The multilayer ferrite structure creates a closed magnetic path, which minimizes crosstalk between components. * **Excellent Solderability:** Usually features nickel barrier terminations with a tin plating for reliable reflow soldering. * **High Reliability:** No wire-winding leads to better mechanical stability and resistance to vibration. #### Common Applications 1. **Noise Filtering:** Used in power supply lines to filter out high-frequency electromagnetic interference (EMI). 2. **RF Circuits:** Found in mobile phones, Wi-Fi modules, and Bluetooth devices for signal matching. 3. **Digital Equipment:** Decoupling in motherboards, tablets, and wearable electronics. --- ### 4. Comparison with Wire-Wound Inductors Compared to traditional wire-wound inductors, the **CS201212-R56K** offers: * **Smaller Footprint:** Easier to integrate into compact consumer electronics. * **Lower Cost:** The multilayer process is highly automated and cost-effective. * **Lower Q-Factor:** Generally has a lower Quality factor than wire-wound versions, making it better for general filtering than high-precision tuning.