The **398LMB035M2BD** is a specific model of an aluminum electrolytic capacitor manufactured by **Illinois Capacitor** (now part of Cornell Dubilier - CDE). This component is designed for high-performance applications requiring significant energy storage and ripple current handling. --- ## Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Capacitance** | 3900 µF (Microfarads) | | **Voltage Rating** | 35 VDC | | **Tolerance** | ±20% (Standard) | | **Termination Style** | Snap-In (2-pin) | | **Operating Temperature** | -40°C to +105°C | | **Lifetime / Endurance** | 3000 Hours at 105°C | | **Configuration** | Polarized Electrolytic | --- ## Physical Characteristics Snap-in capacitors like this one are designed for easy PCB (Printed Circuit Board) mounting, providing a secure physical connection that resists vibration. * **Case Size:** Typically a cylindrical "can" shape. * **Mounting:** Through-hole snap-in leads (usually spaced 10mm apart). * **Dimensions:** Approximately 22mm (Diameter) x 30mm (Length) — *Note: Exact dimensions can vary slightly by manufacturing batch.* --- ## Key Features & Applications ### Features 1. **High Ripple Current:** Designed to handle significant AC fluctuations on top of the DC voltage. 2. **Extended Temperature Range:** The 105°C rating makes it more durable than standard 85°C capacitors in hot environments. 3. **Low ESR:** Provides low Equivalent Series Resistance, which reduces heat generation and improves efficiency. ### Common Applications * **Switching Power Supplies (SMPS):** Used for output filtering to smooth DC voltage. * **Audio Equipment:** Power reservoir for amplifiers to handle peak current demands. * **Industrial Controls:** General-purpose filtering and energy storage in motor drives or PLCs. * **DC-DC Converters:** Reducing voltage ripple in high-current circuits. --- ## Handling Precautions * **Polarity:** This is a polarized component. Installing it backwards will lead to gas buildup and potential explosion/venting. * **Voltage Margin:** It is recommended to operate the capacitor at 80% or less of its rated voltage (35V) for maximum longevity. * **Discharge:** Large capacitors can hold a charge even after power is removed; ensure they are discharged before handling.