Classification of ceramic capacitors

Ceramic capacitors are made by using ceramic as a dielectric, spraying a silver layer on both sides of the ceramic substrate, and then firing the silver film as a plate. Its shape is mostly in the form of a sheet, but also has a shape of a tube or a circle.

Ceramic capacitors are divided into high-frequency ceramics and low-frequency ceramics. A capacitor with a small positive temperature coefficient of capacitance for use in a highly stable tank circuit as a loop capacitor and a pad capacitor.

Low-frequency ceramic capacitors are limited to bypass or DC-blocking in circuits with lower operating frequencies, or where stability and loss are not critical (including high frequencies). Such capacitors are not suitable for use in pulse circuits because they are susceptible to breakdown by pulse voltages.

Ceramic capacitors can be divided into plug-ins and patches according to the package.

According to different media, it can be divided into Class I ceramic dielectric capacitors and Class II ceramic dielectric capacitors. Usually NP0, SL0, COG are Class I ceramic dielectric capacitors; X7R, X5R, Y5U, Y5V are Class II ceramic dielectric capacitors.

Class I ceramic dielectric capacitors have good stability and do not change with temperature, voltage, time, etc., but the general capacity is very small, while the capacity stability of class II ceramic dielectric capacitors is very poor, with temperature, voltage, time changes. The amplitude is large, so ceramic capacitors are generally used in applications where capacity stability is not critical, such as filtering.

High-voltage ceramic capacitors used in high-power and high-voltage fields are required to have small size, high withstand voltage and good frequency characteristics. In recent years, with the advancement of materials, electrodes and manufacturing technology, the development of high-voltage ceramic capacitors has made great progress and has been widely used. High-voltage ceramic capacitors have become an indispensable component of high-power high-voltage electronic products. The use of high-voltage ceramic capacitors is mainly divided into power equipment for power transmission and distribution systems and equipment for processing pulse energy.

The ceramic capacitor is made of ceramic as the dielectric, sprayed with silver layer on both sides of the ceramic substrate, and then made by low-temperature firing of silver film as the plate. The high-frequency porcelain and low-frequency porcelain can be divided into I-class porcelain according to the medium. Dielectric capacitors and Class II ceramic dielectric capacitors can be divided into plug-in and chip-mount depending on the package.