The **1008CP-R47** is a specific part number for a surface-mount (SMD) wire-wound chip inductor. These components are primarily used in high-frequency (RF) circuits for filtering, impedance matching, and resonance. --- ## 1. Part Number Breakdown The naming convention follows standard industry patterns (similar to manufacturers like Coilcraft or Bourns): | Component Segment | Value | Meaning | | :--- | :--- | :--- | | **1008** | Case Size | 0.10 x 0.08 inches (approx. 2.5 x 2.0 mm) | | **CP** | Series | Ceramic core, typically high-performance/RF type | | **R47** | Inductance | **0.47 µH** (470 nH) | --- ## 2. Technical Specifications The "R47" value indicates an inductance of 470 nanohenries. Here are the typical electrical characteristics for this class of inductor: * **Inductance:** 470 nH (0.47 µH). * **Tolerance:** Usually ±5% (J) or ±10% (K). * **Core Material:** Ceramic (Non-magnetic). Ceramic cores provide excellent stability and high Self-Resonant Frequency (SRF). * **Quality Factor (Q):** High Q (typically 30–50+ at specific frequencies), which is essential for minimizing signal loss in RF paths. * **DC Resistance (DCR):** Relatively low (usually between 0.5 to 1.5 Ohms), though higher than power inductors. * **Rated Current:** Typically between 200mA and 500mA. --- ## 3. Key Features & Applications ### Features * **High Resonance:** Because of the ceramic core, the Self-Resonant Frequency is very high, making it usable in the GHz range. * **Wire-Wound Construction:** Provides much higher Q-factors and current handling compared to multilayer ceramic inductors. * **Compact Footprint:** The 1008 size is ideal for space-constrained PCB designs. ### Common Applications 1. **RF Impedance Matching:** Used in the antenna circuitry of Wi-Fi routers, Bluetooth devices, and cellular phones. 2. **Frequency Selection:** Used in LC filters and oscillators to select specific signal bands. 3. **Noise Suppression:** Filtering high-frequency noise in sensitive analog signal lines. --- ## 4. Comparison: Ceramic vs. Ferrite Core Since the 1008CP is a **Ceramic Core** inductor, it differs from Ferrite types: | Feature | Ceramic Core (1008CP) | Ferrite Core | | :--- | :--- | :--- | | **Inductance Range** | Lower (nH to low µH) | Higher (µH to mH) | | **Current Handling** | Moderate | High | | **Frequency Range** | Very High (GHz) | Low to Medium (MHz) | | **Saturation** | Does not saturate | Subject to magnetic saturation |