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.

Ceramic capacitor temperature coefficient.

Temperature coefficient tc the temperature coefficient of a capacitor is the maximum change in its capacitance over a specified temperature range. 5 as in x5r corresponds to 85 c and 7 as in x7r corresponds to 125 c. The first character indicates the lowest temperature that the capacitor can handle. This tutorial explains how ceramic capacitor type designations such as x7r and y5v imply nothing about voltage coefficients.

Engineers must check the data to know really know how a specific capacitor will perform under voltage. 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 letter x as in x7r x5r corresponds to 55 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. That is to say these are c0g characteristics products with a small temperature variance width. Modern c0g np0 formulations contain neodymium samarium and other rare earth oxides. C0g np0 is the most popular formulation of the temperature compensating eia class i ceramic materials.

The second character indicates the maximum temperature. Only available as leaded components. Temperature compensating type multilayer ceramic capacitors have a small temperature coefficient of electrostatic capacitance max. C0g np0 ceramics offer one of the most stable capacitor dielectrics available.

Temperature coefficients of some often used capacitors. The reality of modern small form factor ceramic capacitors is a good reminder to always read the data sheet.