The **CW252016-R18J** is a surface-mount (SMD) wire-wound chip inductor typically used in high-frequency applications. It belongs to the 1008 (metric 2520) size family. --- ### 1. Part Number Breakdown The alphanumeric code follows a standard naming convention for electronic components: | Component Segment | Meaning | Specification | | :--- | :--- | :--- | | **CW** | Series Type | Wire-wound chip inductor | | **2520** | Case Size (Metric) | 2.5mm x 2.0mm (corresponds to **1008** Imperial) | | **16** | Profile/Height | Approximately 1.6mm | | **R18** | Inductance Value | **0.18 µH** (180 nH) | | **J** | Tolerance | **±5%** | --- ### 2. Technical Specifications These are the typical electrical characteristics for this specific part number: * **Inductance:** 180 nH (0.18 µH) * **Quality Factor (Q min):** ~45 (measured at 350 MHz) * **Self-Resonant Frequency (SRF):** ~950 MHz to 1.2 GHz * **DC Resistance (DCR max):** ~0.50 Ohms * **Rated Current (I DC):** ~450 mA * **Operating Temperature:** -40°C to +125°C --- ### 3. Key Construction Features * **Wire-wound Core:** Features a ceramic or ferrite core with copper wire wrapped around it. This construction provides much higher **Q factors** and current handling compared to multilayer inductors. * **Ceramic Body:** The use of ceramic ensures excellent thermal stability and high SRF, making it ideal for RF circuits. * **Encapsulation:** Usually coated with a clear epoxy resin to protect the windings and provide a flat top surface for automated "pick and place" assembly. --- ### 4. Common Applications Due to its high resonance and precision, the CW252016-R18J is found in: 1. **RF Circuits:** Matching networks, filters, and oscillators. 2. **Wireless Communication:** WiFi modules, Bluetooth devices, and GPS receivers. 3. **Broadband I/O:** Signal conditioning in high-speed data lines. 4. **Mobile Infrastructure:** Base stations and telecommunication repeaters. ---