How to compare PET and PP film capacitors for active low pass filter stages? If I implement an active filter which film capacitor is more temperature stable? I guess temperature might vary the capacitor capacitances hence the filter characteristics. So Im wondering which type is safer to use in this respect. Is there a convention to use a specific type?
More specifically here is a KEMET 47n PP type cap: https://eu.mouser.com/datasheet/2/212/F3301_R79-1103144.pdf
And here a KEMET 47n PET type: https://content.kemet.com/datasheets/KEM_F3101_R82.pdf
Im stuck which type would be suitable for such application. From the data-sheets where should we look at? Does anybody have experience?