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.

30 ppm c 25 c reference within the temperature range of 55 c to 125 c. 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. 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 reality of modern small form factor ceramic capacitors is a good reminder to always read the data sheet. This tutorial explains how ceramic capacitor type designations such as x7r and y5v imply nothing about voltage coefficients. Temperature compensating type multilayer ceramic capacitors have a small temperature coefficient of electrostatic capacitance max. Temperature coefficient tc the temperature coefficient of a capacitor is the maximum change in its capacitance over a specified temperature range.

C0g np0 is the most popular formulation of the temperature compensating eia class i ceramic materials. Modern c0g np0 formulations contain neodymium samarium and other rare earth oxides. 5 as in x5r corresponds to 85 c and 7 as in x7r corresponds to 125 c. C0g np0 ceramics offer one of the most stable capacitor dielectrics available.

Temperature coefficients of some often used capacitors. Engineers must check the data to know really know how a specific capacitor will perform under voltage. The letter x as in x7r x5r corresponds to 55 c. The second character indicates the maximum temperature.

Only available as leaded components. Class 3 ceramic capacitors offer higher volumetric efficiency than the class 2 ceramic capacitors but their temperature stability is not nearly so good.