The **FKP2-R** is a series of high-quality **Polypropylene (PP) film capacitors** manufactured by **WIMA**, a renowned German electronic components producer. These capacitors are specifically designed for pulse-handling applications and high-frequency precision circuits. --- ### 1. Key Technical Specifications The FKP2 series is defined by its pulse-duty performance and small lead spacing (5mm). | Feature | Specification | | :--- | :--- | | **Dielectric** | Polypropylene (PP) film | | **Capacitor Electrodes** | Vacuum-deposited metal / Metal foil | | **Tolerance** | ±2.5%, ±5%, ±10% (±1% available on request) | | **Operating Temperature** | -55°C to +100°C | | **Voltage Range** | 63VDC to 1000VDC | | **Dissipation Factor** | Very low ($\tan \delta < 5 \times 10^{-4}$ at 1kHz) | | **PCM (Lead Spacing)** | 5mm (Standard) | --- ### 2. Internal Construction The "R" in the series often refers to the **Radial** lead configuration or specific packaging variations within the series (e.g., Reel/Tape). * **Film/Foil Design:** Unlike standard "metallized" capacitors where the metal is sprayed onto the plastic, the FKP2 uses a combination of metal foil electrodes and plastic film dielectric. This allows for significantly higher pulse loading. * **Encapsulation:** They are housed in a flame-retardant plastic case (UL 94 V-0) with an epoxy resin seal, providing excellent resistance to humidity and vibration. --- ### 3. Core Advantages 1. **High Pulse Endurance:** Capable of handling rapid voltage changes ($dv/dt$) without degrading. 2. **Low Self-Inductance:** Due to the internal construction, they perform exceptionally well at high frequencies. 3. **Negative Temperature Coefficient:** The capacitance changes predictably with temperature, which is useful for compensation in analog circuits. 4. **Audio Quality:** Because of the low dielectric absorption and high stability, they are "audiophile" favorites for signal paths. --- ### 4. Typical Applications The FKP2-R series is commonly found in: * **Audio Equipment:** High-end filters, crossovers, and pre-amplifiers. * **Timing Circuits:** Oscillators and RC timing networks where precision is required. * **Sample-and-Hold:** Due to very low dielectric absorption. * **RF/HF Circuits:** High-frequency decoupling and tuning. --- ### 5. Part Number Example Breakdown A typical part number might look like `FKP2C011001D00JSSD`: * **FKP2:** Series Name. * **C:** Voltage (e.g., 63VDC). * **01100:** Capacitance value (e.g., 1000pF). * **1D:** Size code / PCM (5mm). * **J:** Tolerance (±5%).