For a power supply circuit, I need to add an X2 capacitor. I have space constrains - so, considering choosing a very small SMD component.
The product will be connected to 230V 50Hz mains voltage. The capacitor I am thinking about is 250VAC rated and according to data sheet can cope with 2.5kV surge impulses (data sheet link: https://datasheet.lcsc.com/lcsc/2305040944_PSA-Prosperity-Dielectrics-FH20X153K302EGG_C5557973.pdf)
Are my considerations making sense? Is it ok to use 250VAC X2 in 230VAC environment? Normally, when derating capacitors, I put at least 50%. But, in this particular case, all capacitors from 275VAC are too bulky for my application.