The **CT0603CSF-R18M** is a surface-mount (SMD) wire-wound ceramic core chip inductor. It is commonly used in high-frequency applications where high stability and high Q-factors are required. ### Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 180 nH (Nanohenries) | | **Tolerance** | ±20% (indicated by 'M' suffix) | | **Case Size** | 0603 (Inch) / 1608 (Metric) | | **Core Material** | Ceramic | | **DC Resistance (Max)** | 0.64 Ohms | | **Rated Current** | 400 mA | | **Self-Resonant Frequency (Min)** | 1100 MHz | | **Q Factor (Min)** | 25 @ 100MHz | --- ### Part Number Breakdown Understanding the nomenclature helps in identifying variations of the series: * **CT**: Manufacturer Series (often Central Technologies). * **0603**: Physical dimensions (0.06 x 0.03 inches). * **CSF**: Ceramic Substrate/Wire-wound type. * **R18**: Inductance value (R = decimal point; 0.18 µH = 180 nH). * **M**: Tolerance code (M = ±20%, J = ±5%, K = ±10%). --- ### Key Features and Applications #### Features 1. **High Q Factor:** Because it uses a wire-wound construction on a ceramic core, it maintains low losses at high frequencies. 2. **High Self-Resonant Frequency (SRF):** This allows the inductor to remain inductive deep into the GHz range, preventing it from acting as a capacitor too early. 3. **Stability:** Ceramic cores provide excellent thermal stability compared to ferrite cores. #### Common Applications * **RF Transceivers:** Used in matching networks and filters for wireless communication. * **Bluetooth/WLAN:** Ideal for small-form-factor wireless modules. * **High-speed Signal Lines:** Used for noise suppression and decoupling in high-frequency circuits. * **Broadband Systems:** Employed in CATV and satellite equipment. --- ### Comparison: Ceramic vs. Ferrite Cores | Feature | Ceramic Core (CSF) | Ferrite Core | | :--- | :--- | :--- | | **Inductance Range** | Lower (nH range) | Higher (µH range) | | **Q-Factor** | Very High | Lower | | **Saturation** | No Saturation | Susceptible to Saturation | | **Application** | High-Frequency/RF | Power/Filtering |