## Technical Overview of 30LVD80-R The **30LVD80-R** is a high-voltage ceramic disc capacitor manufactured by **Vishay Cera-Dite**. It belongs to the **30LVD series**, which are specifically designed for low-voltage power supplies and line-frequency filtering where high reliability and specific capacitance values are required. ### 1. Key Specifications | Feature | Specification | | :--- | :--- | | **Capacitance** | 0.08 µF (80,000 pF) | | **Tolerance** | ±20% | | **Rated Voltage** | 300 VAC (Line Voltage) / 800 VDC | | **Dielectric Material** | Y5U (Class II Dielectric) | | **Operating Temperature** | -30°C to +125°C | | **Mounting Type** | Through-hole (Radial Leads) | --- ### 2. Physical Construction * **Coating:** The capacitor is typically encapsulated in a flame-retardant epoxy resin (UL 94 V-0 rated), which provides excellent moisture resistance and insulation. * **Leads:** Features tinned copper radial leads, suitable for soldering onto Printed Circuit Boards (PCBs). * **Disc Size:** The "80" in the part number often correlates to the diameter or specific capacitance code; these discs are relatively large compared to standard decoupling caps due to the voltage rating. --- ### 3. Electronic Behavior and Dielectric (Y5U) The **Y5U** designation is a standard EIA code that describes the stability of the capacitor relative to temperature: * **Y:** Minimum temperature of -30°C. * **5:** Maximum temperature of +85°C (though the component rating may extend to 125°C under specific derating). * **U:** Maximum capacitance change of +22% / -56% over the temperature range. **Note:** Because it is a Class II dielectric, it offers high volumetric efficiency (more capacitance in a smaller size) but is not suitable for precision timing circuits due to its temperature sensitivity. --- ### 4. Common Applications * **AC Line Filtering:** Used in power supplies to filter out high-frequency noise. * **Bypass/Coupling:** Used in circuits where the voltage exceeds the rating of standard 50V or 100V capacitors. * **EMI/RFI Suppression:** Helps in reducing electromagnetic interference in industrial and consumer electronics. * **Snubber Circuits:** Used to protect semiconductors by limiting voltage spikes. --- ### 5. Identification Marking The component usually has specific markings on the body: 1. **Vishay Logo** (or a stylized 'D' for Cera-Mite). 2. **30LVD80** (Part series and value). 3. **300V~** (AC voltage rating).