The **398LMB080M2ED** is a specific model of an aluminum electrolytic capacitor. This component is typically used in power supplies, industrial electronics, and motor controllers for energy storage and filtering. Below is a detailed breakdown of its specifications and characteristics. --- ### 1. Technical Specifications The part number follows the standard naming convention for high-capacitance snap-in electrolytic capacitors. | Parameter | Specification | Details | | :--- | :--- | :--- | | **Capacitance** | 3,900 µF | 398 indicates $39 \times 10^8$ pF | | **Voltage Rating** | 80 VDC | Maximum continuous operating voltage | | **Mounting Type** | Snap-In | Two-prong PCB mounting style | | **Temperature Range** | -40°C to +105°C | Rated for high-temperature environments | | **Case Size** | Approx. 35 x 45 mm | (Diameter x Length) standard sizing | | **Tolerance** | ±20% (M) | Standard industry variance | --- ### 2. Component Construction * **Dielectric:** Aluminum Oxide ($Al_2O_3$). * **Terminals:** Snap-in terminals designed to hold the component securely against the PCB before soldering, which is crucial for heavy components prone to vibration. * **Electrolyte:** Liquid or semi-liquid conductive medium. This component is **polarized**, meaning it has a positive and negative terminal that must be oriented correctly. ### 3. Key Applications Because of its high capacitance and 80V rating, this part is commonly found in: * **AC/DC Power Supplies:** Used as a bulk filter capacitor to smooth out rectified voltage. * **Audio Amplifiers:** Providing "reserve" energy for sudden high-power output demands. * **Industrial Inverters:** Filtering the DC bus in motor drives. * **Solar Power:** Intermediate energy storage in power converters. --- ### 4. Critical Usage Notes * **Polarity:** Connecting the 398LMB080M2ED backwards will cause internal pressure build-up and potential failure (venting). * **Ripple Current:** Check the datasheet for the specific ripple current rating to ensure the part doesn't overheat during high-frequency switching. * **ESR (Equivalent Series Resistance):** Lower ESR is preferred for power efficiency; this model generally features low ESR suitable for power applications.