## Technical Overview: 398LMB080M2DF The **398LMB080M2DF** is a high-performance **Aluminum Electrolytic Capacitor** manufactured by **Illinois Capacitor** (a brand under Cornell Dubilier - CDE). It belongs to the **LMB series**, which is designed for high reliability and high ripple current applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Capacitance** | 3900 µF | | **Voltage Rating (DC)** | 80 VDC | | **Tolerance** | ±20% (at 120 Hz, 20°C) | | **Temperature Range** | -40°C to +105°C | | **Lifetime (Load Life)** | 3,000 Hours @ 105°C | | **Termination Style** | Snap-In (2-Leads) | | **Mounting Type** | Through Hole | --- ### 2. Physical Dimensions & Construction * **Diameter:** 35.00 mm * **Height (Seated):** 40.00 mm * **Lead Spacing:** 10.00 mm * **Case Style:** Aluminum Can with an insulating sleeve and a pressure relief vent on the top/side. --- ### 3. Electrical Characteristics * **ESR (Equivalent Series Resistance):** Typically very low, measured at 120Hz. For this specific model, it is approximately **63.76 mΩ**. * **Ripple Current:** Capable of handling high ripple currents (approx. **4.25 Amps** at 120Hz/105°C), making it suitable for power supply smoothing. * **Leakage Current:** Calculated as $0.02CV$ or $3mA$ (whichever is less) after 5 minutes of applied voltage. --- ### 4. Typical Applications The 398LMB080M2DF is commonly found in industrial and consumer electronics where stable power delivery is critical: 1. **Switching Power Supplies (SMPS):** Used for input/output filtering. 2. **Uninterruptible Power Supplies (UPS):** Energy storage and DC link buffering. 3. **Motor Controllers:** Managing voltage spikes and ripple in drive circuits. 4. **Audio Amplifiers:** Providing large reservoirs of energy for bass peaks. --- ### 5. Part Number Breakdown (CDE/Illinois Capacitor) ```text 398 - Capacitance (39 + 8 zeros in pF = 3900 uF) LMB - Series Name (Snap-in, 105°C) 080 - Voltage (80 Volts DC) M - Tolerance (+/- 20%) 2DF - Case Code (Specific D x L dimensions) ```