The **30LVD56-R** is a specific type of ceramic disc capacitor, commonly manufactured by Vishay (Cera-Mite). It is designed for high-voltage applications and belongs to the **Low-Voltage/High-Voltage AC and DC** capacitor series. --- ## 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Capacitance** | 5600 pF (0.0056 µF) | | **Rated Voltage** | 3000 VDC (3kV) / 1000 VAC | | **Tolerance** | ±20% (Standard for this series) | | **Dielectric Material** | Ceramic (Typically Y5U or X7R depending on subclass) | | **Mounting Type** | Radial Through-Hole | | **Operating Temperature** | -30°C to +125°C | --- ## 2. Construction and Design The "30LVD" series is engineered for durability in high-stress environments: ### Physical Characteristics * **Encapsulation:** The ceramic disc is coated with a flame-retardant epoxy resin (UL 94 V-0 rated). * **Leads:** Tinned copper radial leads, designed for easy soldering onto PCBs. * **Compactness:** Despite the 3kV rating, the disc diameter is optimized for high-density layouts. ### Key Features * **High Reliability:** Designed to handle transient voltage spikes without dielectric breakdown. * **Low Dissipation Factor:** Ensures minimal energy loss as heat during operation. * **Insulation Resistance:** High resistance to prevent leakage currents. --- ## 3. Common Applications Due to its high voltage rating and specific capacitance, the 30LVD56-R is used in circuits where safety and voltage isolation are critical: 1. **Power Supplies:** Used in "snubber" circuits to suppress voltage spikes across switching transistors. 2. **CRT/Displays:** Historical and specialized use in high-voltage sections of monitors. 3. **Lighting Ballasts:** Filtering and decoupling in high-intensity discharge (HID) or fluorescent lighting. 4. **EMI/RFI Filtering:** Used in line-to-ground or line-to-line filtering to reduce electromagnetic interference. --- ## 4. Part Number Breakdown The nomenclature usually follows this logic: * **30LVD:** The series identifier (High Voltage Ceramic Disc). * **56:** The base capacitance value. * **-R:** Indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards.