The part number **HTK-35V391MHC5E-R2** refers to a high-performance **Conductive Polymer Hybrid Aluminum Electrolytic Capacitor**. These components are widely used in automotive and industrial electronics due to their low ESR (Equivalent Series Resistance) and high reliability. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Capacitance** | 390 µF | | **Voltage (Rated)** | 35V DC | | **Tolerance** | ±20% (M) | | **Temperature Range** | -55°C to +125°C | | **Case Size (D x L)** | 10mm x 10.5mm (Code: HC5E) | | **Mounting Type** | Surface Mount (SMD) | | **Endurance** | 4,000 hours at 125°C | --- ### Component Breakdown 1. **Hybrid Technology**: This part combines a liquid electrolyte with a solid conductive polymer. This dual-nature provides the high voltage rating of standard electrolytic capacitors with the ultra-low ESR of solid polymer capacitors. 2. **Part Number Decoding**: * **HTK**: Series name (High temperature, high ripple current, SMD type). * **35V**: Rated voltage. * **391**: Capacitance code (39 followed by one zero = 390µF). * **M**: Tolerance (±20%). * **HC5E**: Case dimension code (10x10.5mm). * **R2**: Packaging/Taping code (usually refers to 13-inch Reel). --- ### Key Applications * **Automotive Electronics**: Ideal for Engine Control Units (ECUs), DC/DC converters, and Advanced Driver Assistance Systems (ADAS). * **Industrial Power Supplies**: Used for smoothing and filtering in high-density power modules. * **Telecom Infrastructure**: Suitable for 5G base stations where heat dissipation is critical. ### Advantages * **Safety**: If the capacitor fails, it is less likely to short-circuit compared to pure solid polymer types. * **Stability**: Offers extremely stable frequency characteristics and low leakage current even at high temperatures. * **Compactness**: High capacitance-to-volume ratio allows for PCB space savings.