The **CT0805HT-R75G** is a high-temperature, surface-mount (SMT) wire-wound chip inductor. It is designed for high-frequency applications where stability and reliability under heat are critical. ### 1. Part Number Breakdown The part number follows a standard nomenclature used by manufacturers like **Central Technologies**: | Component Segment | Description | Value/Meaning | | :--- | :--- | :--- | | **CT** | Series Prefix | Central Technologies | | **0805** | Case Size | 0.08 x 0.05 inches (2.0 x 1.25 mm) | | **HT** | Type | High Temperature / High Q | | **R75** | Inductance | 0.75 µH (750 nH) | | **G** | Tolerance | ±2% | --- ### 2. Technical Specifications Below are the typical electrical characteristics for this specific component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.75 µH | | **Tolerance** | ±2% | | **Quality Factor (Q) Min** | 45 (at 100 MHz) | | **Self-Resonant Frequency (SRF)** | 400 MHz (Minimum) | | **DC Resistance (DCR) Max** | 1.35 Ω | | **Rated DC Current (Idc)** | 400 mA | | **Operating Temperature** | -40°C to +155°C | --- ### 3. Key Physical Features * **Construction:** Wire-wound on a ceramic core. Wire-wound inductors generally offer much higher Q factors and higher current handling compared to multilayer types. * **Size:** 0805 (Metric 2012) is a standard footprint, making it easy to integrate into compact PCB designs. * **Encapsulation:** Often features a clear epoxy or resin coating to protect the fine copper wire while allowing for high-temperature stability. ### 4. Typical Applications Because of the **±2% tolerance** (which is quite tight for an inductor) and the **HT (High Temp)** rating, this part is commonly used in: 1. **RF Circuits:** Impedance matching and filtering in high-frequency communication modules. 2. **Automotive:** Engine control units or sensors where ambient temperatures exceed standard industrial limits. 3. **Aerospace:** Systems requiring high reliability and performance stability under thermal stress. 4. **Oscillators:** Where tight tolerance is necessary to maintain a specific frequency. --- ### 5. Equivalent Replacement Considerations If searching for an equivalent from other brands (like Coilcraft or Murata), ensure you match: 1. **Footprint:** Must be 0805. 2. **Q Factor:** Ensure the replacement meets or exceeds the Q at your specific operating frequency. 3. **SRF:** The self-resonant frequency must be significantly higher than your signal frequency to avoid parasitic effects.