The part number MCAST21GSB5224KTNA01 represents a CAP CER 0.22UF 25V X5R 0805, which is a ceramic capacitor with specific properties. It has a capacitance value of 0.22 microfarads, operates at a voltage of 25 volts, and adheres to the X5R specification. The component's case size is identified as 2012 Metric in the 0805 package format.