The part number **ECOS2DB391BA** refers to a high-quality **Aluminum Electrolytic Capacitor** manufactured by **Panasonic**. This specific component belongs to the TS-HB series (or similar snap-in series), designed for high-voltage and power supply applications. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the ECOS2DB391BA: | Characteristic | Specification | | :--- | :--- | | **Capacitance** | 390 µF (Microfarads) | | **Voltage Rating** | 200V DC | | **Tolerance** | ±20% | | **Temperature Range** | -40°C to +105°C | | **Endurance (Life)** | 3,000 hours at 105°C | | **Termination Style** | Snap-In (2 Pins) | | **Mounting Type** | Through Hole | | **Case Size** | Approximately 22mm (Dia) x 30mm (Length) | --- ### 2. Breakdown of the Part Number Panasonic uses a specific nomenclature for their electrolytic capacitors. Here is how the code is structured: * **ECO**: Prefix for Panasonic Electrolytic Capacitors. * **S2D**: Represents the **Voltage Rating** (2D usually corresponds to 200V). * **B**: Often indicates the series or specific case size/lead configuration. * **391**: The **Capacitance Code**. The first two digits (39) are the significant figures, and the third (1) is the multiplier ($10^1$). So, $39 \times 10 = 390$ µF. * **BA**: Refers to the physical packaging and case dimensions. --- ### 3. Key Features & Applications #### Key Features: * **High Ripple Current:** Designed to handle significant AC current superimposed on the DC voltage. * **Snap-In Terminals:** The leads are shaped to "snap" into a PCB, holding the component in place for soldering. * **Compact Size:** High capacitance-to-volume ratio. #### Common Applications: 1. **Switch Mode Power Supplies (SMPS):** Used as a bulk storage/smoothing capacitor on the primary side. 2. **Inverters:** Filtering DC buses in motor drives or solar inverters. 3. **Industrial Electronics:** General-purpose rectification and energy storage in 110V/220V systems. --- ### 4. Comparison with Similar Parts | Feature | ECOS2DB391BA | Standard General Purpose | | :--- | :--- | :--- | | **Temp Rating** | 105°C (High Temp) | 85°C | | **Lead Type** | Snap-In (Sturdy) | Radial (Wire leads) | | **Application** | Power Electronics | Consumer Electronics | ---