## Electronic Specifications for SCI1008S-R18JF The **SCI1008S-R18JF** is a surface-mount (SMD) wire-wound ceramic chip inductor. These components are primarily used in high-frequency applications due to their high Quality Factor (Q) and stability. ### 1. Key Technical Specifications Below are the primary electrical characteristics for this specific part number: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 180 nH | Measured at 25.2 MHz | | **Tolerance** | ±5% | Indicated by the 'J' suffix | | **DC Resistance (DCR)** | 0.88 Ω (Max) | Resistance of the wire winding | | **Rated Current** | 400 mA (Max) | Maximum continuous DC current | | **Self-Resonant Frequency** | 1000 MHz (Min) | Frequency where it behaves as a resistor | | **Quality Factor (Q)** | 45 (Min) | Efficiency at 50 MHz | | **Case Size** | 1008 (EIA) | 2.5mm x 2.0mm (Metric 2520) | --- ### 2. Part Number Breakdown The part number can be deconstructed to understand its construction and properties: * **SCI**: Series prefix (typically Surface Mount Ceramic Inductor). * **1008**: Package size (0.10 x 0.08 inches). * **S**: Standard or specific series designation. * **R18**: Inductance value (R = decimal point; R18 = 0.18µH or **180nH**). * **J**: Tolerance code (**±5%**). * **F**: RoHS compliance / Lead-free finish. --- ### 3. Application and Usage Because this is a **wire-wound ceramic core** inductor, it offers specific advantages over multilayer or ferrite inductors: * **RF Matching:** Ideal for impedance matching in wireless communication modules. * **Filtering:** Used in low-pass or band-pass filters for high-frequency signals. * **High Q Factor:** Low energy loss, making it perfect for resonant circuits. * **Stability:** The ceramic core provides excellent thermal stability across a wide temperature range (typically -40°C to +125°C). ### 4. Comparison with Other Technologies | Feature | Wire-Wound (SCI1008) | Multilayer Inductors | | :--- | :--- | :--- | | **Q Factor** | High (Better efficiency) | Low to Moderate | | **Current Handling** | High | Low | | **Size** | Larger profiles | Very compact | | **Cost** | Slightly higher | Lower | ---