Doubt ceramic smd capacitor

[Verna_1353]

The document David provided is very good and does answer the questions you are asking for capacitor aging. We have topics already on the Forum about this. Here is a link to another post:

Ceramic Capacitor Aging

Kemet recently came out with a new paper on Ceramic Capacitor Aging and I wanted to share some information on the key topics of Aging, Aging Rate and Deaging. Capacitor aging is a change in capacitance at a constant rate over time. Aging is generally expressed as a percentage per decade hour. Matt R has a great post that explains the decade hour. To help with aging calculations, Kemet has created a Ceramic Aging Calculator r1.xls (185 KB) Capacitance testing and aging is a topic that causes …

Ceramic Capacitor Aging / What is a Decade Hour?

Ceramic capacitors lose a portion of their capacitance value over time as a function of their construction. This loss cannot be avoided, but it can be measured and specified. Manufacturers often use the decade hour as a unit of measurement for this loss. As an example, let’s examine KEMET part number C1210C106K4RACTU. This is a 10uf part with an X7R temperature coefficient. Kemet specifies this part to be within its design tolerances for a specific time window after reflow, and uses the dec…

It seems like every supplier of ceramic capacitors talks about aging . They are really the same type of information as the Kemet PDF provided. Hopefully this helps.