Ceramic Capacitor Temperature Coefficient X7r

For example an image like this is found in the commercial x7r surface mount ceramic capacitor datasheet.

Ceramic capacitor temperature coefficient x7r. Diagram showing construction with standard termination. This capacitance change is non linear. X7r formulations are called temperature stable ceramics and fall into eia class ii materials. The tantalum capacitor exhibits linear capacitance change with respect to temperature.

5 capacitance change at 55 c to 8 at 125 c. The second character indicates the maximum temperature. Common types include c0g np0 x7r y5v z5u although there are many more. The theoretical range is from 45 c to 200 c.

Similarly when manufacturer says that this is a y5v capacitor it means that the capacitor. The ceramic capacitor gains its name from the fact that it uses ceramic materials for its dielectric. So according to the above table when manufacturer says that this is a x7r capacitor it means that the capacitor can operate from 55 degrees centigrade to 125 degrees centigrade temperature and the capacitance of the capacitor will not vary more or less than 15 from its nominal value specified. 5 as in x5r corresponds to 85 c and 7 as in x7r corresponds to 125 c.

Figure 5 illustrates the typical capacitance response over temperature for tantalum capacitors class 2 ceramic x7r capacitors and class 1 ceramic np0 or c0g capacitors. Avx offers a wide range of surface mount mlccs for commercial applications to mission critical. X7r is the most popular of these intermediate dielectric constant materials. The letter x as in x7r x5r corresponds to 55 c.

Temperature compensating formulation are class 1 and temperature stable and general application formulations are classified as class 2. A rule of thumb is the higher the temperature dependence of the ceramic the higher the aging percentage. Details about the layers used in a ceramic capacitor s construction can be found in the series datasheet. X7r x7s ceramic capacitors.

The typical aging of x7r ceramic capacitors is about 2 5 per decade the aging rate of z5u ceramic capacitors is significantly higher and can be up to 7 per decade. Avx surface mount mlccs are available in both class 1 and class 2 formulations. The first character indicates the lowest temperature that the capacitor can handle.