The part number **556FSR310XG3JB** corresponds to a specialized **Film Capacitor** from the **FSR Series**, typically manufactured by companies like Illinois Capacitor (now part of Cornell Dubilier/CDE). These capacitors are known for their high energy density and are often used in power electronics and pulse-discharge applications. --- ### ## Technical Specifications The following table outlines the primary electrical and physical characteristics of this component: | Parameter | Specification | | :--- | :--- | | **Capacitance** | 5.5 µF | | **Tolerance** | ±10% (J) | | **Voltage Rating** | 310 VAC / High DC Equivalent | | **Dielectric Material** | Polypropylene Film | | **Package Type** | Radial Lead / Box Style | | **Operating Temp** | -40°C to +85°C | | **Termination** | Through-hole (Solder pins) | --- ### ### Key Features and Construction 1. **Self-Healing Properties:** As a film capacitor, if a dielectric breakdown occurs due to an overvoltage spike, the metallized layer evaporates around the point of failure, isolating it and allowing the capacitor to continue functioning. 2. **Low ESR/ESL:** Designed for low Equivalent Series Resistance (ESR), making it efficient for high-frequency applications and reducing heat generation. 3. **Stability:** Polypropylene film offers excellent capacitance stability over a wide range of temperatures and frequencies compared to electrolytic capacitors. 4. **Moisture Resistance:** The "G3JB" suffix often denotes specific packaging or environmental protections (epoxy resin sealing) to prevent humidity from affecting the dielectric. --- ### ### Typical Applications This specific part is frequently found in the following circuits: * **AC Filtering:** Used in power supplies to filter out noise on AC lines. * **Motor Run Circuits:** Provides the necessary phase shift for small AC motors. * **Power Factor Correction (PFC):** Improves the efficiency of power distribution in industrial equipment. * **Pulse Power:** Utilized in circuits requiring rapid discharge of stored energy. --- ### ### Comparison with Standard Capacitors | Feature | Film Capacitor (556FSR) | Aluminum Electrolytic | | :--- | :--- | :--- | | **Lifespan** | Very Long (No liquid electrolyte) | Limited (Dries out over time) | | **Polarity** | Non-polarized | Polarized (Must observe +/-) | | **Surge Handling** | Excellent | Poor | | **Size** | Larger per µF | Smaller per µF | ---