The **440LT47-R** is a high-performance, single-layer ceramic disc capacitor manufactured by Vishay Cera-Mite. It is specifically designed for AC line applications, primarily used for electromagnetic interference (EMI) suppression. --- ### ## Technical Specifications Below are the primary electrical and physical characteristics of the 440LT47-R: | Parameter | Value / Specification | | :--- | :--- | | **Capacitance** | 4700 pF (4.7 nF) | | **Tolerance** | ±20% | | **Voltage Rating (AC)** | 400 VAC (Class X1), 400 VAC (Class Y1) | | **Dielectric Material** | Y5U (Ceramic) | | **Operating Temperature** | -30°C to +125°C | | **Mounting Type** | Through-hole (Radial leads) | | **Safety Standards** | UL, CSA, VDE, IEC 60384-14 | --- ### ### Key Features and Safety Classes This component is classified as a "Safety Capacitor," meaning it is designed to fail in a way that does not lead to electric shock or fire. 1. **Class X1 Rating:** Used in "across-the-line" applications. It can withstand high impulse voltages (up to 4kV) for industrial power supplies. 2. **Class Y1 Rating:** Used in "line-to-ground" applications. This is the highest safety rating for capacitors, designed to prevent electric shock if the capacitor fails, making it suitable for double-insulated appliances. 3. **Encapsulation:** The disc is coated with a flame-retardant epoxy resin (UL 94 V-0 rated) to ensure thermal stability and safety. --- ### ### Common Applications The 440LT47-R is typically found in the input stages of power electronics: * **EMI/RFI Filtering:** Reducing electrical noise generated by switching power supplies. * **Power Supplies:** AC-to-DC converters and adapters. * **Industrial Equipment:** Used in motor controllers and heavy machinery. * **Consumer Electronics:** Household appliances and computer peripherals. --- ### ### Typical Connection Schematic In a standard EMI filter, the capacitor is placed as follows: ```text L (Line) ----[ X1 Cap ]---- N (Neutral) | L (Line) ----[ Y1 Cap ]---- G (Ground) N (Neutral)---[ Y1 Cap ]---- G (Ground) ``` *(The 440LT47-R can serve in any of these positions due to its dual X1/Y1 rating.)*