The CL21B683KCCWPNC is a Multilayer Ceramic Capacitor (MLCC) manufactured by Samsung. It is a Surface Mount Technology (SMT) device, designed for use in portable electronic devices and other high-density electronic assemblies. It features a low ESR (equivalent series resistance) and high capacitance, making it ideal for decoupling/filtering, energy storage, and frequency smoothing applications. It features a maximum operating voltage of 6.3 volts and a capacitance range of 680 picofarads to 6.8 nanofarads. It is available in a variety of surface mount packages, including X2L, X2R, 6.3V Flatpack, and & 8mm x 6.2mm.