The **440LT22-R** is a high-performance ceramic disc capacitor specifically designed for **AC line-rated** applications. It belongs to the Vishay Cera-Mite series and is widely used in power supplies and EMI filtering. ### 1. Key Specifications The following table summarizes the primary electrical and physical characteristics: | Feature | Specification | | :--- | :--- | | **Capacitance** | 2200 pF (2.2 nF) | | **Voltage Rating** | 440 VAC (X1) / 300 VAC (Y2) | | **Tolerance** | ±20% | | **Dielectric Material** | Ceramic (Y5U) | | **Operating Temperature** | -30°C to +125°C | | **Mounting Type** | Through-hole (Radial) | | **Safety Certification** | UL, CSA, VDE (Safety Rated) | --- ### 2. Safety Classifications (X1/Y2) The most critical aspect of the 440LT22-R is its safety rating, which determines where it can be placed in a circuit: * **X1 Class:** Designed for "Line-to-Line" applications. These capacitors are built to withstand high impulse voltages (up to 4kV) to prevent fire hazards in the event of a short circuit. * **Y2 Class:** Designed for "Line-to-Ground" applications. These are engineered with high reliability to prevent electric shock to the user if the capacitor fails. --- ### 3. Construction and Material * **Encapsulation:** The capacitor is coated with a flame-retardant epoxy resin (UL 94 V-0 rated), which provides moisture resistance and insulation. * **Dielectric (Y5U):** This is a Class II ceramic material. It offers high volumetric efficiency (high capacitance in a small size), though its capacitance may vary slightly with temperature changes. * **Leads:** Typically features tinned copper wire for easy soldering onto Printed Circuit Boards (PCBs). --- ### 4. Common Applications Due to its robust safety ratings, the 440LT22-R is commonly found in: 1. **Switch Mode Power Supplies (SMPS):** Filtering electromagnetic interference (EMI). 2. **Motor Suppression:** Reducing electrical noise generated by brushes or windings. 3. **Antenna Coupling:** Providing isolation in radio and television circuits. 4. **Line bypass:** Protecting sensitive electronics from surges on the AC mains. --- ### 5. Part Number Breakdown While manufacturer codes vary slightly, the "440LT22" typically translates to: * **440:** The maximum AC voltage rating (440V). * **L:** Lead style or series designation. * **T:** Temperature characteristic or tolerance code. * **22:** Base capacitance value (2200 pF). * **-R:** RoHS compliant (Lead-free).