Ceramic capacitor is important to maintain the operating temperature above -55°C if you want stable operation.With the voltage 6.3V, it is capable of operating.
C0603C394K9RAC7867 Features
with the voltage - Rated DC of 6.3V
C0603C394K9RAC7867 Applications
There are a lot of KEMET C0603C394K9RAC7867 applications of ceramic capacitors.