The **CE201210-R18J** is a high-frequency multilayer ceramic chip inductor. It is commonly used in RF (Radio Frequency) circuits and high-speed signal processing. Below is a detailed breakdown of its specifications and electronic characteristics. ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical constraints: | Segment | Meaning | Value / Description | | :--- | :--- | :--- | | **CE** | Series | Multilayer Chip Inductor (Ceramic) | | **201210** | Case Size | 2.0mm x 1.25mm x 1.0mm (EIA 0805) | | **R18** | Inductance | 0.18 µH (180 nH) | | **J** | Tolerance | ±5% | --- ### 2. Key Electrical Specifications These parameters define how the component performs under load and frequency: * **Inductance:** 180 nH (measured at a specific test frequency, usually 25MHz to 100MHz). * **Quality Factor (Q):** Typically high for ceramic inductors, ensuring low energy loss in resonant circuits. * **Self-Resonant Frequency (SRF):** The frequency at which the part stops behaving like an inductor. For this value, it is usually in the range of **400MHz - 600MHz**. * **DC Resistance (DCR):** Usually low (approx. 0.40 - 0.70 Ω) to prevent excessive heat and voltage drop. * **Rated Current:** Generally around **200mA to 400mA**, depending on the specific manufacturer (e.g., Bourns or Taiyo Yuden). --- ### 3. Construction and Features The CE201210 series is built using a **Multilayer Technology** which offers several advantages: * **Monolithic Structure:** The layers are integrated into a single ceramic block, providing high reliability and magnetic shielding. * **No Cross-talk:** The closed magnetic circuit minimizes electromagnetic interference (EMI) with surrounding components. * **Excellent Solderability:** Usually features nickel-barrier terminations with a tin plating (Ni/Sn) for reflow soldering. --- ### 4. Typical Applications Because of its small size (0805) and high-frequency stability, it is used in: 1. **RF Matching:** Impedance matching for Wi-Fi, Bluetooth, and cellular antennas. 2. **Filtering:** Low-pass or band-pass filters in communication equipment. 3. **Signal Conditioning:** Decoupling and noise suppression in high-speed digital lines. --- ### 5. Schematic Symbol & Footprint In PCB design software (like Altium or KiCad), use the following: ```text Symbol: -L- (Inductor) Package: 0805 (Metric 2012) L x W: 2.00mm x 1.25mm ```