The **440LD50-R** is a specific type of high-voltage ceramic disc capacitor manufactured by Vishay Cera-Mite. It is primarily used in power supplies and industrial equipment for electromagnetic interference (EMI) suppression. --- ### 1. Key Technical Specifications The following table outlines the primary electrical characteristics of the 440LD50-R: | Feature | Specification | | :--- | :--- | | **Capacitance** | 0.005 µF (5,000 pF) | | **Tolerance** | ±20% | | **Voltage Rating** | 440 VAC (RMS) / 760 VAC | | **Safety Class** | X1 / Y1 | | **Dielectric Material** | Y5U (Ceramic) | | **Operating Temperature** | -30°C to +125°C | | **Termination Style** | Radial Leaded | --- ### 2. Safety Class Significance (X1 / Y1) The most critical aspect of this component is its safety rating: * **Y1 Rating:** These capacitors are designed for use in "Line-to-Ground" applications. A failure in this position could lead to electric shock; therefore, Y1 capacitors are built to high standards to ensure they do not fail in a short-circuit mode. * **X1 Rating:** These are used in "Line-to-Line" applications to bridge the AC line. They are designed to withstand high impulse voltages (up to 4kV or higher) without igniting. --- ### 3. Physical Construction The part is identified by its distinctive physical properties: * **Encapsulation:** Coated with flame-retardant epoxy resin (UL 94 V-0). * **Marking:** The body typically displays the manufacturer logo, capacitance value, voltage rating, and safety agency approval marks (e.g., UL, CSA, VDE). * **Lead Spacing:** Usually features a standard 10mm (0.400") lead pitch for PCB mounting. --- ### 4. Common Applications * **AC Adapter Input:** Used as a filter at the entry point of power supplies to block noise from entering or leaving the device. * **Industrial Controls:** Protecting sensitive electronics from voltage surges in heavy machinery. * **Motor Suppression:** Reducing electrical noise generated by brushes or switching in AC motors. * **Line-to-Ground Filtering:** Essential for meeting global EMC (Electromagnetic Compatibility) standards. ---