The **1008HT-R18TJLC** is a high-temperature, surface-mount (SMD) wirewound inductor manufactured by **Coilcraft**. It is designed specifically for demanding environments, such as automotive or aerospace applications. --- ### ## Technical Specifications The following table highlights the core electrical and physical parameters of this component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 180 nH (0.18 µH) | | **Tolerance** | ±5% (indicated by 'J') | | **Case Size** | 1008 (2.5 x 2.0 mm) | | **Max DC Current (Ims)** | 1.0 Amps | | **DC Resistance (DCR)** | 0.56 Ohms (Max) | | **Self-Resonant Frequency (SRF)** | 900 MHz (Min) | | **Operating Temperature** | -40°C to +200°C | | **Core Material** | Ceramic | --- ### ### Key Features and Construction 1. **Wirewound Ceramic Core**: Unlike ferrite cores, the ceramic core provides exceptional thermal stability and a high Self-Resonant Frequency (SRF), making it ideal for high-frequency RF applications. 2. **High-Temperature Rating**: The "HT" series is rated for **200°C**, which is significantly higher than standard commercial grade inductors (usually capped at 125°C). 3. **High Q Factor**: The wirewound construction allows for a high Quality factor (Q), ensuring low signal loss in resonant circuits. 4. **AEC-Q200 Grade**: These parts are typically qualified for automotive use, meaning they can withstand high vibration and thermal shock. --- ### ### Part Number Breakdown Understanding the nomenclature helps in identifying variations: * **1008**: The physical footprint (0.10 x 0.08 inches). * **HT**: High Temperature series (200°C). * **R18**: The inductance value (R = decimal point; 180 nH). * **T**: Termination style (often refers to RoHS compliant matte tin over nickel over silver-platinum-glass frit). * **J**: Tolerance code (J = ±5%). * **LC**: Packaging/Special code (L = 7" reel, C = Plastic carrier tape). --- ### ### Common Applications * **RF Tuning & Filtering**: Used in high-frequency wireless communication modules. * **Under-the-Hood Automotive**: Sensors and control units located near engines or exhaust systems. * **Down-hole Drilling**: Equipment that operates in extreme geothermal temperatures. * **Aerospace & Defense**: High-reliability circuits exposed to wide temperature fluctuations.