The ceramic disk capacitor is a kind of single encapsulated disk-shaped capacitor, but first we need to know that it is a ceramic capacitor
The Ceramic Capacitor is a passive electronic component that is capable of storing an electrical charge, it behaves like a filter that blocks direct current and allows alternating current to flow without any problem. They are capacitors
The capacity of a condenser varies with temperature. The different dielectrics of the many types of capacitors show large differences in temperature dependence. Based on these differences, we classify ceramic capacitors into Class 1, 2 and 3.
The temperature coefficient is expressed in parts per million (ppm) per degree Celsius for Class 1 ceramic capacitors or as a percentage (%) over the total temperature range for Class 2 capacitors.
But it is not only the temperature that makes the capacitor capacity vary. Most types of discrete capacitors have larger or smaller capacitance changes with increasing frequencies. The dielectric strength of class 2 ceramic and plastic film decreases with increasing frequency. Therefore, its capacitance value decreases with increasing frequency. This phenomenon is related to dielectric relaxation in which the time constant of electric dipoles is the reason for the dependence of permittivity on frequency
But also the voltage can vary the capacitor's capacity. This effect is more common in class 2 ceramic capacitors. Ferroelectric material depends on the applied voltage. The higher the applied voltage, the lower the permittivity. The higher voltage measured or applied capacitance can drop to values of -80% of the measured value with the standardized measurement voltage of 0.5 or 1.0 V. This behavior is a small source of non-linearity in low distortion filters and other analog applications. . In audio applications, this may be the reason for harmonic distortions.
There are also disc capacitors for very high power, and even tubular ones that are used in radio transmitting stations among others, and their classification is the same as that of classes 1, 2 and 3, previously mentioned. We refer here to capacitors that work between 2 kV and 100 kV.
Regarding practical issues of commercial identification: Normally we will see in them some numbers that have to do with their value, such as 102. In this case this number is translated as follows: