The **UCS2W331MHD** is a high-performance, high-voltage aluminum electrolytic capacitor manufactured by **Nichicon**. It belongs to the **CS series**, which is specifically designed for high reliability and long life in demanding applications. --- ## 1. Technical Specifications The following table summarizes the key electrical characteristics of the UCS2W331MHD: | Feature | Specification | | :--- | :--- | | **Manufacturer** | Nichicon | | **Series** | CS (High Reliability / Long Life) | | **Capacitance** | 330 µF | | **Tolerance** | ±20% | | **Rated Voltage** | 450V DC | | **Temperature Range** | -25°C to +105°C | | **Life Expectancy** | 10,000 Hours (at 105°C) | | **Termination Style** | Radial Lead (Through-Hole) | | **Diameter** | 18.00mm | | **Height (Seated)** | 40.00mm | --- ## 2. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical properties: * **UC**: Series Code (CS Series). * **S2W**: Voltage Rating (2W = 450V). * **331**: Capacitance Code (33 followed by 1 zero = 330µF). * **M**: Tolerance (M = ±20%). * **HD**: Package/Lead Style (Bulk, Radial). --- ## 3. Key Features & Applications ### Features * **Extended Longevity:** Rated for 10,000 hours at its maximum temperature, making it ideal for devices that are difficult to service or require 24/7 operation. * **High Voltage Handling:** The 450V rating makes it suitable for power factor correction (PFC) and primary-side filtering. * **Robust Construction:** Designed to handle significant ripple currents without overheating. ### Common Applications 1. **LED Lighting Drivers:** Used in high-power industrial LED ballasts. 2. **Power Supplies (SMPS):** Acting as a bulk capacitor for AC-to-DC conversion. 3. **Industrial Inverters:** Filtering output in motor drives or renewable energy systems. 4. **Adapters:** High-efficiency chargers and wall warts. --- ## 4. Usage Considerations When designing a circuit with the UCS2W331MHD, keep the following in mind: * **Polarity:** As an electrolytic capacitor, it is polarized. Reversing the voltage will cause the safety vent to rupture or the part to explode. * **Size Constraints:** With a height of 40mm, ensure your enclosure has enough vertical clearance. * **Derating:** For maximum lifespan, it is common practice to operate the capacitor at 80-90% of its rated voltage (e.g., using a 450V cap for a 400V rail).