[tab10672]

Why are they never used in restorations? If the value and voltages match then what are the disadvantages? Thanks, todd

[Bob Andersen]

Depending on the type, the capacitance can vary greatly with temperature. NP0 and C0G are the most stable, but also cost the most. Cheapies like Z5U can vary +22%/-56%. More info here: http://en.wikipedia.org/wiki/EIA_Class_2_dielectric

Another potential issue is that their capacitance varies with the applied voltage. Not really a factor when used as bypass or when coupling small voltage swings but large amplitude signals can get distorted.