Ceramic capacitor is important to maintain the operating temperature above -55°C if you want stable operation.With the voltage 1kV, it is capable of operating.
C1825C333KDRAC7800 Features
with the voltage - Rated DC of 1kV
C1825C333KDRAC7800 Applications
There are a lot of KEMET C1825C333KDRAC7800 applications of ceramic capacitors.