The **440LT33-R** is a high-performance, safety-certified ceramic disc capacitor manufactured by Vishay Cera-Mite. It is specifically designed for AC line applications where safety and reliability are paramount. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the 440LT33-R: | Parameter | Specification | | :--- | :--- | | **Capacitance** | 3,300 pF (3.3 nF) | | **Tolerance** | ±20% | | **Voltage Rating** | 400 VAC (X1), 400 VAC (Y1) | | **Dielectric Material** | Ceramic (Class 2) | | **Operating Temperature** | -30°C to +125°C | | **Mounting Type** | Through-Hole (Radial) | | **Lead Spacing** | 10.0 mm (standard) | --- ### 2. Safety Classifications: X1 and Y1 The "440L" series belongs to a class of safety-rated capacitors. These ratings define how the part behaves under high-voltage surges: * **X1 Rating:** Used in "across-the-line" applications. It is designed to handle high impulse voltages (up to 4kV) to prevent fires if the capacitor fails. * **Y1 Rating:** Used in "line-to-ground" applications. This is the strictest safety rating; the capacitor is designed to fail "open" to prevent a user from receiving a fatal electric shock. ### 3. Core Features * **Flame Retardant:** The outer encapsulation is made of UL 94 V-0 flame-retardant epoxy resin. * **High Reliability:** Designed to withstand harsh AC line transients and lightning surges. * **RoHS Compliant:** The "-R" suffix indicates that the part is compliant with Restriction of Hazardous Substances (lead-free). --- ### 4. Common Applications These capacitors are typically found in the Input Filter stage of power supplies: 1. **Switch Mode Power Supplies (SMPS):** Filtering electromagnetic interference (EMI). 2. **AC Adapters:** Used in chargers for laptops and mobile devices. 3. **Home Appliances:** Filtering noise in washing machines, refrigerators, and dishwashers. 4. **Industrial Controls:** Protecting sensitive electronics from mains power spikes. ---