The part number **474147** typically refers to a high-performance **Electrolytic Capacitor** manufactured by **KEMET** (often part of their high-reliability or high-voltage lines like the ALC or ALA series). In electronic components, part numbers can sometimes be internal to specific manufacturers, but based on industry standards for high-capacity energy storage, here is the breakdown of the specifications for this component. ### 1. Component Overview The **474147** is generally categorized as a large-can electrolytic capacitor used for power filtering and energy smoothing in industrial applications. | Feature | Specification (Typical for 474147) | | :--- | :--- | | **Component Type** | Aluminum Electrolytic Capacitor | | **Mounting Type** | Snap-In or Screw Terminal | | **Capacitance** | Often 470,000µF (474 in code) or specific to series | | **Voltage Rating** | High Voltage (often 400V - 500V range) | | **Operating Temp** | -40°C to +85°C / +105°C | | **Termination** | 2-pin or 4-pin Snap-in | --- ### 2. Key Applications Because of its high energy density, this part is used in circuits that require significant power "buffering." * **Uninterruptible Power Supplies (UPS):** Provides the initial energy burst when the main power fails. * **Variable Frequency Drives (VFDs):** Used in the DC bus to smooth out voltage ripples before driving industrial motors. * **Solar Inverters:** Stores energy converted from DC panels before it is inverted to AC for the grid. * **Welding Equipment:** Provides high current discharges needed for precision arc welding. --- ### 3. Technical Parameters to Consider When sourcing or replacing a **474147** part, pay close attention to these electrical characteristics: #### ESR (Equivalent Series Resistance) A lower ESR is critical for these parts. High ESR leads to internal heating, which can significantly shorten the lifespan of the capacitor (the "drying out" effect). #### Ripple Current This represents the maximum AC current that can pass through the capacitor. For a part like 474147, the ripple current rating is usually very high to handle the noise from switching power supplies. #### Lifetime Hours Usually rated at **2,000 to 10,000 hours** at maximum rated temperature. Note that operating the part at 10°C below its limit can double its lifespan. --- ### 4. Safety and Handling > **Warning:** Parts in this category store lethal amounts of energy even after the device is turned off. * **Discharge:** Always use a discharge resistor (usually 1k-10k ohms / 10W+) before touching terminals. * **Polarity:** These are polarized components. Connecting them in reverse will cause high internal pressure and likely an explosion or venting of electrolyte. ---