The **LPX331M400H3P3** is a high-voltage, snap-in aluminum electrolytic capacitor manufactured by **Cornell Dubilier (CDE)**. It is part of the LPX series, designed for high-ripple current applications and long-term reliability. --- ### 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Capacitance** | 330 µF | | **Voltage Rating** | 400 VDC | | **Tolerance** | ±20% | | **Operating Temperature** | -40°C to +85°C | | **Service Life** | 1,000 hours at 85°C | | **Termination Style** | Snap-In (2 Pins) | | **Dimensions (D x L)** | 35mm x 30mm | | **Lead Spacing** | 10.00 mm | --- ### 2. Breakdown of the Part Number The alphanumeric code follows a specific naming convention: - **LPX**: Series name (85°C High Voltage Snap-In). - **331**: Capacitance value (33 followed by 1 zero = 330µF). - **M**: Tolerance (M = ±20%). - **400**: Voltage rating (400 Volts). - **H3P3**: Case size code (Specific height and diameter dimensions). --- ### 3. Key Electronic Functions This component is vital in power electronics due to its ability to store large amounts of energy at high voltages. * **Smoothing/Filtering:** Commonly used in the output stages of bridge rectifiers to convert AC ripples into a steady DC voltage. * **Energy Storage:** Provides bulk energy storage for high-power switching circuits to handle sudden load demands. * **Voltage Buffering:** Protects sensitive downstream components from voltage transients and fluctuations. --- ### 4. Common Applications Due to its high voltage rating (400V) and snap-in mounting, this part is typically found in: 1. **Switch Mode Power Supplies (SMPS):** Acting as the primary input filter capacitor. 2. **Uninterruptible Power Supplies (UPS):** Managing DC link voltages. 3. **Variable Speed Drives:** Used in motor controllers and industrial inverters. 4. **Audio Amplifiers:** Providing high-voltage rails for power stages. ---