This section provides overview, applications, and principles of ceramic capacitors. Also, please take a look at the list of 28 ceramic capacitor manufacturers and their company rankings.
Ceramic capacitors are inexpensive and are the most widely used in a wide range of applications.
Titanium dioxide and alumina are the main ceramic materials used, with different characteristics depending on the material.
The use of barium titanate is slightly more expensive but results in a capacitor with higher capacitance.
Ceramic capacitor have better temperature stability than other capacitors because ceramic itself is heat-resistant.
Because of their good frequency characteristics, ceramic capacitor is used in high-frequency circuits.
Ceramic capacitors are used as bypass capacitors in digital circuits.
Ceramic capacitors are also used as coupling capacitors or line filters because of their property of allowing AC current to pass through but not DC current.
Ceramic capacitors are therefore used in AC/DC and DC/DC converter circuits and circuit breaker circuits.
They are also used to cancel high and low frequency noise.
The principle is the same as that of general capacitors.
A ceramic dielectric is placed between the electrodes, and when a voltage is generated between the electrodes, an electric charge is stored in the electrodes, and when a certain amount of charge is stored, it is released, thus exhibiting the characteristics of a capacitor.
The capacity of the charge stored by a capacitor is called capacitance, and its capacity and properties vary depending on the material of the dielectric, the distance between the electrodes, and the number of dielectric layers.
Ceramic capacitors are classified into low dielectric constant type, high dielectric constant type, and semiconductor type.
For example, carbon film resistors and metal film resistors are small in body size, so their resistance values are indicated by color codes. Ceramic capacitors, which are leaded components, also have a small body size, so basically the capacitance is not directly stated as "0.1uF" or "10uF," etc., but is indicated only with a 1- to 3-digit number.
The "nF (nanofarad)" is an unfamiliar unit, but 1000pF = 1nF = 0.001uF. (Notation by Si prefix).
On the other hand, many chip-type ceramic capacitors do not list capacitance on the body. When mounting or replacing parts, it is advisable to remove the capacitor from the tape immediately before use, or store it in a case that can be divided into smaller pieces, and check the capacitance with a tester that can measure capacitance before mounting.
In general, ceramic capacitors have no polarity and can be mounted in either direction in a circuit.
In the case of leaded components, since the capacitance is printed on only one side, it is recommended that the side with the printed capacitance face the same direction.
Ceramic capacitors naturally have an upper limit to the voltage that can be applied, but depending on the size and rating of the capacitor itself, this may not be stated on the capacitor itself, or it may be stated as an abbreviation. When using capacitors in circuits that handle particularly high voltages, please carefully check the datasheet or manufacturer's model number. The manufacturer's model number, which is a long list of alphanumeric characters, also contains information on withstand voltage.
*Including some distributors, etc.
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