The **398LMB050M2BF** is a high-performance **Aluminum Electrolytic Capacitor** typically used in power supply filtering and energy storage applications. It is manufactured by Illinois Capacitor (now part of Cornell Dubilier - CDE). ### 1. Technical Specifications The part number follows a specific coding structure that defines its electrical characteristics: | Feature | Specification | | :--- | :--- | | **Capacitance** | 3900 µF (Microfarads) | | **Voltage Rating** | 50 WVDC (Working Voltage DC) | | **Tolerance** | ±20% (Standard) | | **Operating Temperature** | -40°C to +105°C | | **Lifetime (Load Life)** | 3000 Hours at 105°C | | **Termination Style** | Snap-In (2 Pins) | | **Mounting Type** | Through-Hole | --- ### 2. Physical Dimensions The "M2BF" suffix in the part number often relates to the specific case size and lead configuration: * **Diameter:** Approximately 22 mm to 25 mm (typical for this range). * **Height:** Approximately 30 mm to 40 mm. * **Lead Spacing:** Usually 10 mm for standard snap-in terminals. --- ### 3. Key Performance Indicators This capacitor belongs to the **LMB series**, which is designed for high ripple current and extended longevity. * **High Ripple Current:** Designed to handle significant AC current superimposed on the DC voltage without overheating. * **Low ESR:** Low Equivalent Series Resistance ensures high efficiency and minimal internal heat generation. * **Snap-In Design:** The terminals are designed to "snap" into a PCB, providing mechanical stability during the soldering process. --- ### 4. Common Applications Due to its high capacitance and voltage rating, the 398LMB050M2BF is commonly found in: 1. **Switching Power Supplies (SMPS):** Used for output filtering to smooth DC voltage. 2. **Uninterruptible Power Supplies (UPS):** Energy storage for short-term power backup. 3. **Audio Amplifiers:** Providing "bulk" capacitance for power rails to handle peak transient demands. 4. **Industrial Controls:** Power conditioning and noise suppression. --- ### 5. Identification Logic The part number can be broken down as follows: * **398:** The first two digits are significant figures, the third is the multiplier ($39 \times 10^8$ in pF = 3,900 µF). * **LMB:** The series name (High Temp/Long Life). * **050:** The voltage rating (50V). * **M:** Tolerance code (±20%).