The part number **C1812H393DGGALTU** refers to a high-reliability, high-temperature Multilayer Ceramic Capacitor (MLCC) manufactured by **KEMET**. --- ## 1. Part Number Breakdown The alphanumeric code follows KEMET’s standard identification system: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **C** | Series | Ceramic Chip Capacitor | | **1812** | Case Size | 1.8 x 1.2 inches (approx. 4.5 x 3.2 mm) | | **H** | High Temp | Rated for high-temperature environments (up to 200°C) | | **393** | Capacitance | 39,000 pF (39 nF) | | **D** | Tolerance | ±0.5 pF (Note: In high values, this usually implies a specific precision grade) | | **G** | Voltage | 2000 V (2 kV) | | **G** | Dielectric | C0G (NP0) - Ultra-stable dielectric | | **AL** | Termination | Standard Solder / Nickel Barrier | | **TU** | Packaging | 7" Reel / Unmarked | --- ## 2. Technical Specifications This component is designed for demanding power electronics applications where stability and durability are critical. ### Electrical Characteristics * **Capacitance:** 39 nF (0.039 µF). * **Voltage Rating:** 2000 VDC (High Voltage). * **Dielectric (C0G/NP0):** This is a Class I material, meaning it shows no change in capacitance with respect to time and voltage, and has a negligible change in capacitance with reference to ambient temperature. * **Dissipation Factor:** Extremely low, reducing energy loss as heat. ### Environmental & Physical * **Operating Temperature:** Typically rated up to **200°C**, making it suitable for "down-hole" (oil/gas), automotive, or aerospace applications. * **Case Size:** 1812 (Large footprint to accommodate high voltage spacing and thick ceramic layers). --- ## 3. Key Applications Because of the **C0G dielectric** and **2kV rating**, this part is typically used in: 1. **Resonant Circuits:** Where stability of frequency is required. 2. **Snubber Circuits:** To protect IGBTs or MOSFETs from high-voltage spikes. 3. **High-Temperature Sensors:** Used in automotive engines or industrial kilns. 4. **Medical Equipment:** High-voltage imaging or scanning devices. ---