Ceramic capacitor is important to maintain the operating temperature above -55°C if you want stable operation.With the voltage 250V, it is capable of operating.
C06CF300K-9UN-X1T Features
with the voltage - Rated DC of 250V
C06CF300K-9UN-X1T Applications
There are a lot of Dielectric Laboratories (Knowles) C06CF300K-9UN-X1T applications of ceramic capacitors.