The **440LT68-R** is a specific type of ceramic disc capacitor, primarily designed for safety-critical applications. It belongs to the **Vishay Cera-Dite 440L Series**, which are high-voltage, AC-rated components. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature used by Vishay/Cera-Mite. Below are the primary technical characteristics: | Feature | Specification | | :--- | :--- | | **Capacitance** | 0.0068 µF (6.8 nF) | | **Voltage Rating** | 440 VAC (Standard) / 500 VAC (Industrial) | | **Safety Class** | X1 / Y1 | | **Dielectric Material** | Ceramic (Class 2) | | **Tolerance** | Typically ±20% | | **Operating Temp Range** | -30°C to +125°C | | **Mounting Type** | Through-hole (Radial Leads) | --- ### 2. Safety Class Breakdown (X1/Y1) The "440L" series is most notable for its safety certifications. These capacitors are designed to fail "open" rather than "short" to prevent electrical fire or shock. * **Class X1:** Used for "Across-the-line" applications. They are designed to handle high impulse voltages (up to 4kV) in industrial settings. * **Class Y1:** Used for "Line-to-ground" applications. This is the most stringent safety rating, providing protection against electric shock even if the capacitor fails, making it suitable for bridging double or reinforced insulation. --- ### 3. Physical Construction The **440LT68-R** is constructed to withstand harsh environmental conditions: * **Encapsulation:** The capacitor is coated in a flame-retardant epoxy resin (UL 94 V-0 rated). * **Electrodes:** Silver electrodes are deposited on both sides of the ceramic disc. * **Leads:** Tinned copper wire radial leads. * **The "-R" Suffix:** Usually indicates compliance with **RoHS** (Restriction of Hazardous Substances) standards. --- ### 4. Typical Applications Because of its safety ratings and high voltage tolerance, this part is commonly found in: 1. **Switch Mode Power Supplies (SMPS):** Used for EMI/RFI filtering. 2. **AC Adapters:** Filtering noise between the primary and secondary stages. 3. **Industrial Equipment:** Motor controllers and heavy machinery where line surges are common. 4. **Household Appliances:** Safety filtering in washing machines, dishwashers, and refrigerators. --- ### 5. Part Number Decoding To understand the specific variant: * **440L:** Series identifier (Safety Certified AC Disc). * **T:** Temperature characteristic/Dielectric code. * **68:** Capacitance value (The first two digits; "68" represents the base value). * **-R:** RoHS Compliant.