The part number **398LBA035M2BC** refers to a high-performance **Aluminum Electrolytic Capacitor**, typically manufactured by companies like Illinois Capacitor (now part of Cornell Dubilier/CDE). Below is a detailed breakdown of its specifications and electronic characteristics. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's core attributes: | Segment | Meaning | Value | | :--- | :--- | :--- | | **398** | Capacitance Code | 3900 µF (39 + 8 zeros in pF) | | **LBA** | Series Code | Snap-in, Long Life Series | | **035** | Voltage Rating | 35 Volts DC | | **M** | Tolerance | ±20% | | **2BC** | Case Size/Form | Specific physical dimensions (Diameter x Length) | --- ### 2. Technical Specifications These are the typical operating parameters for this specific component: * **Type:** Aluminum Electrolytic (Snap-In Terminal) * **Capacitance:** 3,900 µF * **Rated Voltage:** 35 VDC * **Tolerance:** ±20% at 120Hz, 20°C * **Operating Temperature:** -40°C to +85°C * **Dissipation Factor (Tan δ):** ~0.35 (varies by specific series revision) * **Leakage Current:** $\leq 3 \sqrt{CV}$ or a fixed value (typically < 3mA after 5 mins) * **Termination:** 2-pin snap-in (designed for PCB mounting stability) --- ### 3. Key Electronic Characteristics #### A. Snap-In Design The "LBA" series features snap-in terminals. These are rigid, shaped leads that "snap" into pre-drilled holes on a PCB. This provides mechanical stability during soldering and prevents the capacitor from vibrating loose in high-vibration environments. #### B. Filtering and Storage With a capacity of **3,900 µF**, this part is primarily used for **bulk energy storage** and **DC ripple filtering**. It smooths out the voltage fluctuations in power supplies after rectification. #### C. ESR and Ripple Current Being a large electrolytic, it is designed to handle significant **Ripple Current**. This makes it suitable for power stages where high-frequency switching or heavy load demands occur. --- ### 4. Common Applications * **Switching Power Supplies (SMPS):** Input/Output filtering. * **Audio Amplifiers:** Power reservoir to handle peak bass demands. * **Industrial Controls:** Ensuring stable DC bus voltages. * **Consumer Electronics:** General-purpose rectification and smoothing. ---