Capacitance change with DC voltage

For this Kyocera part number, please provide the derating curve with dc voltage.

Hello james.meiss, welcome to the DigiKey TechForum.
I have to go to our product specialist that handles the Kyocera AVX parts, to see if we can get this information. When I get the reply, I will post the information.

Hello James,

In the interim, you may be interested in this Technical Paper from KYOCERA AVX concerning the DC bias characteristics of ceramic capacitors.

For example, it provides this graphic showing the percent change for a representative capacitor.

This does have some interesting implications for your design:

  • can your design function with this DC bias fluctuation?
  • do you over specify the capacitance?
  • do you over specify the voltage?
  • do you use parallel capacitors to improve board layout and reduce BOM line count?

So many things to consider.

Best Wishes,


1 Like

Information of the requested type is commonly available from manufacturers’ websites, in this case under the “characteristic data” link on this page.

1 Like

The data from @rick_1976’s link goes to show you how drastically the capacitance can change with DC bias voltage applied to a ceramic capacitor, particularly on smaller smt packages with relatively high voltage and capacitance ratings.

In this case, an X5R ceramic capacitor in an 0603 package rated for 25V and 10uF drops from 10uF with no DC voltage down to around 2uF with less than 9V applied. At 20V, it’s less than 1uF. Schematic designers need to be aware of this.

1 Like