The **SCI0805S-R15F** is a surface-mount (SMD) wire-wound ceramic chip inductor. It is commonly used in high-frequency applications where high precision and high Q-factors are required. --- ### 1. Technical Specifications The part number follows a standard nomenclature for electronic components. Here are the core parameters: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 150 nH | Represented by "R15" (0.15µH) | | **Tolerance** | ±1% | Represented by "F" (tight tolerance) | | **Case Size** | 0805 | 2.0mm x 1.25mm (Imperial) | | **DC Resistance (DCR)** | ~0.56 Ω (Max) | Depends on specific manufacturer | | **Rated Current** | ~400 mA | Maximum continuous current | | **SRF** | > 1200 MHz | Self-Resonant Frequency | | **Core Material** | Ceramic | Non-magnetic core for high-frequency stability | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying equivalent parts: 1. **SCI**: Series prefix (Wire-wound Chip Inductor). 2. **0805**: Physical dimensions (0.08 inches by 0.05 inches). 3. **S**: Standard or specialized series designation (often relates to high Q). 4. **R15**: Inductance value. The "R" acts as a decimal point in microhenries (0.15µH = 150nH). 5. **F**: Tolerance code. F stands for ±1%. --- ### 3. Key Features & Applications #### Features * **High Q Factor:** The wire-wound construction on a ceramic core provides lower losses at high frequencies compared to multilayer inductors. * **High SRF:** The self-resonant frequency is high, making it suitable for RF filtering. * **Precision:** The 1% tolerance makes it ideal for tuning circuits and oscillators. #### Common Applications * **RF Communications:** Cellular phones, GPS, and Wi-Fi modules. * **Broadband IT:** High-speed signal processing. * **Tuning Circuits:** Used in LC filters and matching networks where exact inductance is critical. * **VCOs:** Voltage-controlled oscillators. --- ### 4. Comparison: Ceramic vs. Ferrite Core It is important to note why this specific part uses a **Ceramic Core**: | Feature | Ceramic Core (SCI0805S) | Ferrite Core (Alternative) | | :--- | :--- | :--- | | **Frequency Range** | Very High (GHz range) | Low to Medium | | **Saturation** | No magnetic saturation | Can saturate at high currents | | **Q-Factor** | High at RF frequencies | High at lower frequencies | | **Inductance Value** | Typically lower (< 1uH) | Typically higher (> 1uH) |