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Ceramic dielectric capacitor

Capacitors with a small positive capacitance temperature coefficient are used in highly stable oscillating circuits as circuit capacitors and pad capacitors. Low-frequency ceramic capacitors are limited to bypass or DC-blocking in circuits with low operating frequencies, or where stability and loss requirements are not high. Such capacitors should not be used in pulsed circuits because they are easily hit by pulsed voltage wear.

Description

Capacitance:Standing Capacitor
Tolerance:Standing tolerance
Type:Capacitor
Rated Voltage:Standing V
Operating Temperature:Standing C
Temperature:Standing C

Definition

A high-dielectric constant capacitor ceramic (barium titanate-titanium oxide) is extruded into a circular tube, a wafer or a disc as a medium, and silver is plated on the ceramic as an electrode by a fire infiltration method. It is divided into two types of high-frequency porcelain and low-frequency porcelain.

Features

① Since the dielectric material of the capacitor is ceramic, it has good heat resistance and is not easy to age.

② Porcelain dielectric capacitors are resistant to acid, alkali and salt corrosion, and have good corrosion resistance.

③ The dielectric constant of the low-frequency ceramic material is large, so the low-frequency ceramic dielectric capacitor has a small volume and a large capacity.

④ Good insulation performance, can be made into high voltage capacitors.

⑤ The relationship between the loss tangent of the high-frequency ceramic material and the frequency is small, so high-frequency ceramic capacitors can be used in high-frequency circuits.

⑥ Cheap price and abundant raw materials are suitable for mass production.

The ceramic capacitor has small capacitance and low mechanical strength.

Function and role

1. The capacity loss has high stability with temperature and frequency.

2. Special series structure is suitable for high voltage and extremely long-term reliability.

3.High current climbing rate and suitable for non-inductive structure of high current loop.

Material

Type I capacitor ceramic: its dielectric constant is generally less than 100, its electrical performance is stable, and it basically does not change with temperature, voltage, and time. It is an ultra-stable, low-loss capacitor dielectric material, which is often used for stability and reliability Where high frequency, ultra high frequency and very high frequency are required.

Type Ⅱ capacitor ceramics: its dielectric constant is generally greater than 1000, and its electrical performance is relatively stable. It is suitable for DC blocking, coupling, bypass, and filter circuits, as well as medium and low frequency applications with high reliability requirements.

Type Ⅲ capacitor ceramics: It has a high dielectric constant and is widely used in places where capacity stability and loss requirements are not high.

Classification

According to the dielectric material, it can be divided into: high dielectric constant capacitor and low dielectric constant capacitor;

According to the operating frequency, it can be divided into: high-frequency ceramic capacitors and low-frequency ceramic capacitors;

According to the working voltage can be divided into: high-voltage ceramic capacitors and low-voltage ceramic capacitors.

According to the external structure, it can be divided into: disc shape, tube shape, through-heart type, tube shape and laminated type.

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