The **30LVD90-R** is a high-voltage ceramic disc capacitor manufactured by Vishay Cera-Mite. These capacitors are specifically designed for high-voltage power supply applications and are known for their reliability and compact size. --- ## 1. Technical Specifications The following table summarizes the core electronic characteristics of the 30LVD90-R: | Parameter | Specification | | :--- | :--- | | **Capacitance Value** | 9,000 pF (0.009 µF) | | **Rated DC Voltage** | 3,000 VDC (3 kV) | | **Tolerance** | ±20% (M) | | **Temperature Coefficient** | Y5S (Stable within ±22% over -30°C to +85°C) | | **Dissipation Factor** | 2.0% Maximum | | **Dielectric Strength** | 150% of rated voltage (4,500 VDC) | | **Mounting Type** | Through-hole (Radial Leads) | --- ## 2. Key Features * **High Voltage Stability:** Designed to operate continuously at 3kV, making it suitable for high-stress electrical environments. * **Encapsulation:** The disc is typically coated with flame-retardant epoxy resin (conforming to UL 94 V-0 standards) for moisture protection and electrical insulation. * **Low Losses:** The ceramic material is optimized for low dissipation, ensuring the component doesn't overheat during high-frequency filtering. * **Compact Footprint:** Offers a high capacitance-to-volume ratio compared to film capacitors of similar voltage ratings. --- ## 3. Applications The 30LVD90-R is commonly found in the following electronic circuits: 1. **Switching Power Supplies (SMPS):** Used for snubbing and noise suppression across high-voltage lines. 2. **HV DC-DC Converters:** Acts as a decoupling capacitor to stabilize voltage. 3. **Lighting Ballasts:** Filtering in high-intensity discharge (HID) or fluorescent lighting systems. 4. **CRT Displays:** Legacy application in voltage multiplier circuits. 5. **Industrial Equipment:** Surge protection and EMI filtering in heavy machinery controllers. --- ## 4. Part Number Breakdown (Vishay Cera-Mite Logic) The part number can be interpreted as follows: * **30:** Represents the voltage rating (30 = 3.0 kV). * **LV:** Series identifier (Low voltage/high capacitance ceramic series). * **D90:** Indicates the capacitance value (90 corresponds to 9,000 pF). * **-R:** Indicates compliance with RoHS standards (Lead-free).