The part number **0603CS-R21XGLW** refers to a high-frequency, wirewound ceramic chip inductor manufactured by **Coilcraft**. This specific component is part of the 0603CS series, widely used in RF (Radio Frequency) applications. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the specific technical characteristics of the component: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | 0603CS | 0603 Package size (1.6 x 0.8 mm), Wirewound Ceramic Core | | **Inductance** | R21 | 210 nH (R denotes decimal point in microhenries) | | **Tolerance** | X | Historically used for special specs, but typically ±2% or ±5% in this series | | **Termination** | G | Gold-plated terminations (RoHS compliant) | | **Testing** | L | Standard testing | | **Packaging** | W | 7″ machine-ready embossed tape (plastic carrier) | --- ### 2. Key Technical Specifications The 0603CS series is known for its exceptionally high Q-factors and resonant frequencies. | Parameter | Value | | :--- | :--- | | **Inductance** | 210 nH | | **Tolerance** | ±2% (Common for 'G'/'X' variants in this range) | | **Quality Factor (Q) min** | 28 at 100 MHz | | **SRF (Self Resonant Freq)** | 1430 MHz (Typical) | | **DCR (Max DC Resistance)** | 1.10 Ohms | | **Irms (Max DC Current)** | 250 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Physical Characteristics * **Core Material:** Ceramic. Unlike ferrite cores, ceramic cores do not saturate, providing excellent stability across varying currents. * **Construction:** Wirewound. This involves wrapping a fine copper wire around a ceramic body, which allows for much higher Q-factors compared to multilayer inductors. * **Size:** 0603 Imperial (1608 Metric). Dimensions are approximately **1.6 x 0.8 x 0.8 mm**. --- ### 4. Typical Applications Because of its high SRF and Q-factor, this inductor is primarily used in: 1. **Impedance Matching:** Tuning circuits for antennas in mobile phones or Wi-Fi modules. 2. **Filter Networks:** Used in Band-pass or Low-pass filters for RF signals. 3. **VCOs:** Voltage Controlled Oscillators requiring high stability. 4. **RF Chokes:** Decoupling high-frequency noise from DC power lines. --- ### 5. Equivalent/Alternative Search If this specific Coilcraft part is unavailable, engineers often look at the following series for equivalents: * **Murata:** LQW18A Series * **TDK:** MHQ1608P Series * **Taiyo Yuden:** AQ Series