The part number **C0805H393DGGAETU** refers to a high-reliability, high-temperature ceramic capacitor manufactured by **KEMET**. This component is specifically designed for harsh environments, such as automotive or industrial power electronics. --- ### 1. Part Number Breakdown The KEMET part numbering system provides specific details about the component's physical and electrical characteristics: | Code Segment | Description | Value | | :--- | :--- | :--- | | **C** | Series | Standard Ceramic | | **0805** | Case Size | 0805 (2.0mm x 1.25mm) | | **H** | High Temperature | 200°C Max Operating Temp | | **393** | Capacitance | 39,000 pF (39 nF) | | **D** | Capacitance Tolerance | ± 0.5 pF (Note: Often implies precision) | | **G** | Voltage Rating | 2000 V (2 kV) | | **G** | Dielectric | C0G (NP0) - Ultra stable | | **A** | Failure Rate | N/A (Standard) | | **E** | Termination | Gold (Au) - For high temp/wire bonding | | **T** | Packaging | 7" Reel | | **U** | Quality Grade | Automotive (AEC-Q200) | --- ### 2. Key Technical Specifications This capacitor is notable for its **C0G dielectric** combined with a **high voltage** rating. * **Capacitance:** 39 nF (0.039 µF). * **Voltage DC:** 2000 VDC (2 kV). * **Operating Temperature Range:** -55°C to +200°C (Extended range). * **Dielectric (C0G):** These capacitors are "Class I" materials. They do not show any change in capacitance with respect to time and voltage, and have a negligible change in capacitance with reference to ambient temperature. * **Termination:** The **Gold (Au)** finish is used to prevent oxidation at extreme temperatures and is often preferred for conductive epoxy attachment or specific soldering requirements in high-reliability sectors. --- ### 3. Common Applications Due to its high voltage rating and extreme temperature tolerance, this part is typically used in: 1. **Downhole Exploration:** Oil and gas drilling equipment where ambient temperatures exceed 175°C. 2. **Automotive Power Electronics:** Inverters and charging systems for EVs. 3. **Aerospace & Defense:** High-voltage power supplies and engine control units. 4. **Snubber Circuits:** Protecting semiconductors from high-voltage spikes. --- ### 4. Comparison: C0G vs. X7R | Feature | C0G (This Part) | X7R (Standard) | | :--- | :--- | :--- | | **Stability** | Extremely High (0 ppm/°C) | Moderate (±15%) | | **Aging** | None | 1% per decade hour | | **Piezoelectric Noise** | Zero | Present | | **Efficiency** | High (Low ESR/ESL) | Lower |