The **XFWICS1008-R27J** is a surface-mount (SMD) wire-wound ceramic core chip inductor. It belongs to the 1008 (2520 metric) series, commonly used in high-frequency RF applications due to its high quality factor (Q) and stability. --- ### 1. Part Number Breakdown Understanding the naming convention helps identify the specific characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **XF** | Manufacturer Code | XFMRS (Common prefix) | | **WICS** | Product Type | Wire-wound Inductor, Ceramic Substrate | | **1008** | Case Size | 0.10 x 0.08 inches (2.5 x 2.0 mm) | | **R27** | Inductance Value | 0.27 µH (270 nH) | | **J** | Tolerance | ±5% | --- ### 2. Key Specifications While exact values can vary slightly by manufacturer, the standard 1008-R27J specifications are typically: * **Inductance:** 270 nH (Nanohenries) * **Tolerance:** ±5% (indicated by 'J') * **Quality Factor (Q):** High Q (typically 45–60 at 350 MHz) * **Self-Resonant Frequency (SRF):** Approximately 900 MHz to 1.1 GHz * **DC Resistance (DCR):** Max ~1.00 Ω * **Rated Current:** ~450 mA to 600 mA (RMS) * **Operating Temperature:** -40°C to +125°C --- ### 3. Construction and Materials The "WICS" series utilizes a specific build style: 1. **Ceramic Core:** Unlike ferrite cores, ceramic does not saturate, ensuring the inductance remains stable across varying currents. 2. **Wire-Wound:** Copper wire is wound around the ceramic body. This construction provides much lower DC resistance and higher current handling compared to multilayer chip inductors. 3. **Epoxy Coating:** Often capped with a clear or colored epoxy for mechanical protection and to facilitate "pick and place" assembly. --- ### 4. Typical Applications Due to the high SRF and Q factors, this part is ideal for: * **RF Tuning:** Used in oscillators and resonant circuits. * **Impedance Matching:** Essential for antenna circuits in wireless devices. * **Filtering:** Low-pass or band-pass filters in telecommunications. * **Mobile Devices:** Bluetooth, Wi-Fi modules, and cellular transceivers. --- ### 5. Equivalent Comparison If this specific part is unavailable, engineers often look for these common equivalents: * **Coilcraft:** 1008CS-271XJLC * **Bourns:** CW252016-R27J * **Murata:** LQW2UASR27J00L ---