The part number **398LBA050M2BE** refers to a high-performance **Aluminum Electrolytic Capacitor** manufactured by **Illinois Capacitor** (now part of Cornell Dubilier/CDE). This specific component is part of the **LBA series**, which is designed for high reliability and long life in industrial applications. --- ### 1. Technical Specifications | Parameter | Specification | | :--- | :--- | | **Capacitance** | 3,900 µF | | **Voltage Rating** | 50 VDC | | **Tolerance** | ±20% (M) | | **Temperature Range** | -40°C to +105°C | | **Lifetime** | 2,000 to 3,000 Hours @ 105°C | | **Termination Style** | Snap-In (2-Prong) | | **Case Size (D x L)** | 22mm x 30mm (approximate) | --- ### 2. Breakdown of the Part Number The alphanumeric code follows the manufacturer's logic for identifying specific characteristics: * **398**: Represents the capacitance value. The first two digits (39) are the significant figures, and the third digit (8) is the multiplier ($10^8$ in pF). $39 \times 10^8 \text{ pF} = 3,900 \text{ µF}$. * **LBA**: The series name (Snap-in, 105°C rated, high ripple current). * **050**: The Rated DC Voltage (50 Volts). * **M**: The capacitance tolerance code ($\pm 20\%$). * **2BE**: The physical case size and lead configuration code (specific to the Snap-in terminal pitch and diameter). --- ### 3. Key Features & Applications #### Features * **Snap-In Terminals:** Designed for easy PCB mounting and stability during wave soldering. * **High Ripple Current:** Capable of handling significant AC components superimposed on DC, which is vital for power supplies. * **Extended Temperature:** Rated up to **105°C**, making it suitable for environments with poor ventilation or high ambient heat. #### Common Applications 1. **Switching Power Supplies (SMPS):** Used for output filtering to smooth DC voltage. 2. **Audio Amplifiers:** Acts as a reservoir capacitor to provide instantaneous current for bass peaks. 3. **Industrial Controls:** Power conditioning for motor drives and PLC systems. 4. **Inverters:** Used in solar or UPS systems for energy storage. --- ### 4. Circuit Symbol and Usage In a schematic, this component is represented by a polarized capacitor symbol. ```markdown + ---|(--- - (Positive) ``` **Precaution:** Since this is an electrolytic capacitor, it is **polar**. Connecting it with the polarity reversed can lead to component failure, venting, or explosion. The negative terminal is typically marked with a stripe on the side of the casing.