The **XFWICS1008-R47J** is a surface-mount (SMD) wire-wound ceramic core inductor. These components are primarily used in high-frequency RF (Radio Frequency) circuits due to their high quality factor (Q) and stable performance. --- ### 1. Technical Specifications The part number follows a standard nomenclature where "1008" refers to the physical size and "R47" refers to the inductance value. | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH (470 nH) | | **Tolerance** | ±5% (indicated by 'J') | | **Case Size** | 1008 (2.5mm x 2.0mm / 0.10" x 0.08") | | **Core Material** | Ceramic (Non-magnetic) | | **Winding Type** | Wire-wound | | **SRF (Self-Resonant Freq)** | ~375 MHz (typical for this range) | | **DC Resistance (DCR)** | ~0.95 - 1.2 Ω (Max) | | **Rated Current** | ~450 mA - 600 mA | --- ### 2. Physical Construction * **Ceramic Core:** Unlike ferrite cores, ceramic cores provide excellent thermal stability and very high **Self-Resonant Frequencies (SRF)**. They do not saturate, making them ideal for signal processing. * **Wire-Wound Design:** Copper wire is wrapped around the ceramic body. This construction allows for much lower DC resistance and higher current handling compared to multilayer chips of the same size. * **Encapsulation:** Usually features a clear epoxy or resin coating on top to protect the wire and provide a flat surface for pick-and-place vacuum nozzles. --- ### 3. Key Applications Because of its high precision and high-frequency characteristics, it is commonly found in: * **RF Filters:** Band-pass and low-pass filters in wireless communication. * **Impedance Matching:** Tuning antenna circuits for Wi-Fi, Bluetooth, and cellular modules. * **Oscillators:** Used in VCOs (Voltage Controlled Oscillators) to set frequency. * **Signal Decoupling:** Removing high-frequency noise from power lines in sensitive RF stages. --- ### 4. Part Number Breakdown `XFWI` (Series) `CS` (Ceramic Substrate) `1008` (Size) `-` `R47` (0.47µH) `J` (5% Tolerance) ```python # Conversion Note # R47 = 0.47 microHenries (µH) # R47 = 470 nanoHenries (nH) ```