Ceramic Capacitor Temperature Coefficient

Engineers must check the data to know really know how a specific capacitor will perform under voltage.

Ceramic capacitor temperature coefficient.

The temperature coefficient of a capacitor is generally expressed linearly as parts per million per degree centigrade ppm o c or as a percent change over a particular range of. C0g np0 ceramics offer one of the most stable capacitor dielectrics available. This tutorial explains how ceramic capacitor type designations such as x7r and y5v imply nothing about voltage coefficients. A typical performance for the change of capacitance with temperature is 22 to 56 over a range of 10 c to 55 c.

The temperature coefficient is expressed in parts per million ppm per degree celsius for class 1 ceramic capacitors or in percent over the total temperature range for class 2 capacitors. The second character indicates the maximum temperature. 30 ppm c 25 c reference within the temperature range of 55 c to 125 c. Modern c0g np0 formulations contain neodymium samarium and other rare earth oxides.

Class 3 ceramic capacitors offer higher volumetric efficiency than the class 2 ceramic capacitors but their temperature stability is not nearly so good. The letter x as in x7r x5r corresponds to 55 c. Temperature coefficients of some often used capacitors. Temperature compensating type multilayer ceramic capacitors have a small temperature coefficient of electrostatic capacitance max.

5 as in x5r corresponds to 85 c and 7 as in x7r corresponds to 125 c. The reality of modern small form factor ceramic capacitors is a good reminder to always read the data sheet. That is to say these are c0g characteristics products with a small temperature variance width. The theoretical range is from 45 c to 200 c.

Ceramic capacitor temperature coefficient tc coding class i temperature compensation type ceramic tc tc tolerance ppm c ppm c symbol for tc 25c to 85c see 4 10 25c to 55c calculated np0 c0 30ppm 30 72 n33 s1 30ppm 30 79 n75 u1 30ppm 30 89 n150 p2 30ppm 30 105. C0g np0 is the most popular formulation of the temperature compensating eia class i ceramic materials.