## Detailed Overview of PB-5R0H474-R The **PB-5R0H474-R** is a high-performance **Supercapacitor** (also known as an Electric Double Layer Capacitor or EDLC) manufactured by Eaton (formerly Bussmann). It belongs to the **PB Series**, which is designed for high energy density and long-term power backup applications. --- ### 1. Key Technical Specifications The following table summarizes the electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Capacitance** | 0.47 Farads (470,000 µF) | | **Voltage Rating** | 5.0 Volts (DC) | | **Tolerance** | -20% to +80% | | **ESR (Equivalent Series Resistance)** | ≤ 30 Ω | | **Mounting Type** | Through-Hole (Radial Lead) | | **Operating Temperature** | -25°C to +70°C | | **Lifetime** | 1000 hours at 70°C (at rated voltage) | | **Dimensions** | Approx. 11.5mm (Diameter) x 19.5mm (Height) | --- ### 2. Functional Characteristics * **High Capacitance:** Unlike standard electrolytic capacitors measured in microfarads (µF), this device offers 0.47 Farads, allowing it to store significantly more energy. * **Energy Storage vs. Power Delivery:** Because it has a relatively high ESR (30 Ω), it is optimized for **memory backup** (low current over long periods) rather than high-power pulse applications (like starting a motor). * **Eco-Friendly:** It is RoHS compliant and does not contain heavy metals like lead or cadmium found in some batteries. --- ### 3. Applications The PB-5R0H474-R is primarily used as a bridge between a battery and a standard capacitor or as a battery replacement for low-power circuits. 1. **RTC (Real-Time Clock) Backup:** Keeps the time and date updated in appliances even when unplugged. 2. **Volatile Memory Backup:** Maintains SRAM data during power outages in industrial controllers or smart meters. 3. **Solar Energy Storage:** Stores energy harvested from small solar cells to power low-power sensors at night. 4. **Set-top Boxes and White Goods:** Provides backup power for settings and user preferences. --- ### 4. Comparison: Supercapacitor vs. Battery | Feature | Supercapacitor (PB-5R0H474-R) | Rechargeable Battery (Li-ion/NiMH) | | :--- | :--- | :--- | | **Charge Time** | Seconds to Minutes | Hours | | **Cycle Life** | > 500,000 cycles | 500 - 1,000 cycles | | **Energy Density** | Lower | Higher | | **Safety** | High (No thermal runaway) | Moderate (Risk of fire/leakage) | --- ### 5. Installation Note When soldering the PB-5R0H474-R onto a PCB, ensure correct **polarity**. While many capacitors are bipolar, EDLCs like this one are polarized. Reversing the voltage can lead to electrolyte leakage and permanent component failure.