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voltage / temperature co-efficient of a capacitor

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diarmuid

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Basic enough question but can anyone explain to me why exactly a capacitor has a temp / voltage co-efficient?

Is it to do with the dielectric or the materials used for the plates? Do ceramic caps have higher co-efficients than others?

Thanks,

Diarmuid
 

There are many types of capacitors, with various dielectrics. Many have the problems you mention, mostly low-cost ceramic types. For high-quality audio applications, polyester capacitors are recommended, for RF applications, special ceramics.

The higher the dielectric permittivity, the higher temperature and voltage effects. Electrolytics offer a high capacitance in a small volume but they are mostly very sensitive to temperature, voltage and polarity.
 
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