The **CE201210-R27J** is a surface-mount multilayer ceramic chip inductor. It is commonly used in high-frequency circuits for filtering, impedance matching, and decoupling. --- ## 1. Part Number Breakdown The part number follows a standard nomenclature used by manufacturers (like Bourns or similar) to define physical and electrical characteristics. | Segment | Meaning | Details | | :--- | :--- | :--- | | **CE** | Product Series | Multilayer Chip Inductor (Ceramic Type) | | **201210** | Case Size (EIA) | 2.0mm x 1.25mm x 1.0mm (0805 Imperial) | | **R27** | Inductance Value | R denotes decimal; 0.27 µH (270 nH) | | **J** | Tolerance | ±5% | --- ## 2. Technical Specifications These parts are designed for high-density mounting and provide stable electrical characteristics across a wide frequency range. * **Inductance:** 0.27 µH (270 nH) * **Tolerance:** ±5% * **Q Factor:** Typically high (usually >25 at 25MHz) to ensure low signal loss. * **Self-Resonant Frequency (SRF):** High SRF (typically >400 MHz), making it suitable for RF applications. * **DCR (DC Resistance):** Low resistance to minimize power loss and heat generation. * **Rated Current:** Usually ranges between 150mA to 300mA depending on the specific manufacturer series. --- ## 3. Physical Dimensions (0805 Package) The "201210" code translates to the following dimensions: | Dimension | Metric (mm) | Tolerance | | :--- | :--- | :--- | | **Length (L)** | 2.00 mm | ± 0.2 mm | | **Width (W)** | 1.25 mm | ± 0.2 mm | | **Thickness (T)** | 1.00 mm | ± 0.2 mm | --- ## 4. Key Applications Because this is a multilayer ceramic inductor rather than a wire-wound type, it offers excellent electromagnetic shielding and high reliability. * **RF Modules:** Used in Bluetooth, Wi-Fi, and cellular front-end modules. * **EMI Suppression:** Filtering high-frequency noise in digital signal lines. * **Impedance Matching:** Ensuring maximum power transfer between stages in RF amplifiers. * **Mobile Devices:** Ideal for smartphones and tablets due to the small 0805 footprint.