The **1008HT-R27TJLC** is a high-temperature, surface-mount (SMT) wire-wound ceramic core inductor manufactured by **Coilcraft**. It is part of the 1008HT series, designed specifically for high-frequency applications where thermal stability is critical. ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the specific characteristics of the component: | Segment | Value | Meaning | | :--- | :--- | :--- | | **1008** | Case Size | 0.10 x 0.08 inches (2.5 x 2.0 mm) | | **HT** | Series | High Temperature (Ceramic Core) | | **R27** | Inductance | 0.27 µH (270 nH) | | **T** | Tolerance | ±5% | | **J** | Termination | Silver-palladium-platinum-glass frit | | **L** | Packaging | 7″ machine-ready reel | | **C** | Testing | Standard commercial testing | --- ### 2. Key Technical Specifications The electrical performance of this inductor is optimized for RF circuits. * **Inductance:** 270 nH * **Tolerance:** ±5% * **Quality Factor (Q min):** 45 at 100 MHz * **Self-Resonant Frequency (SRF typ):** 600 MHz * **DCR (Direct Current Resistance) max:** 1.50 Ohms * **Idc (Maximum Rated Current):** 390 mA * **Operating Temperature:** -40°C to +200°C (Extremely high range) --- ### 3. Material and Construction * **Core Material:** Ceramic. Unlike ferrite cores, ceramic cores do not saturate and provide excellent stability across a wide range of frequencies and temperatures. * **Winding:** Wire-wound. This construction provides higher Q factors and lower DC resistance compared to multilayer inductors of the same size. * **Encapsulation:** These parts are typically "open" or feature a top-side cap for vacuum pickup during automated assembly. --- ### 4. Common Applications Due to its high-temperature rating and RF stability, this part is commonly found in: 1. **Aerospace & Defense:** Engines or sensors where ambient heat is high. 2. **Oil & Gas:** Downhole drilling equipment. 3. **Automotive:** Under-the-hood electronics and transmission control units. 4. **RF Filtering:** Impedance matching and resonance circuits in high-frequency transmitters. --- ### 5. Footprint (Dimensions) | Dimension | Inches | Millimeters | | :--- | :--- | :--- | | Length | 0.115 (max) | 2.92 | | Width | 0.110 (max) | 2.79 | | Height | 0.080 (max) | 2.03 |