Characteristics and selection of ceramic capacitors
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- Time of issue:2020-04-09 14:26
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(Summary description)Ceramic capacitors are currently the most widely used capacitors in electronic equipment, accounting for about 50% of the total number of capacitors used. However, due to the lack of understanding of their characteristics by many people, they lack due attention in use. In order to meet the standardization and standardization requirements of use, the following is an overview of the characteristics of ceramic capacitors and the matters needing attention in use: 1. Characteristic classification of ceramic capacitors: Ceramic capacitors have the advantages of good heat resistance, excellent insulation, simple structure, and low price. However, the characteristics of different ceramic materials are very different and must be selected correctly according to the requirements of use. Ceramic capacitors are classified into high-frequency ceramic capacitors (Class 1 ceramic) and low-frequency ceramic capacitors (Class 2 ceramic) according to frequency characteristics; high-voltage ceramic capacitors (above 1KVDC) and low-voltage ceramic capacitors (below 500VDC) , Are described as follows: 1. High-frequency ceramic capacitors (also known as Class 1 ceramic capacitors) The loss of this type of ceramic capacitor varies little with frequency in a wide range, and the high-frequency loss value is very small (tanδ≤0.15%, f=1MHz), and the maximum operating frequency can reach more than 1000MHz. At the same time, this type of ceramic capacitor has excellent temperature characteristics and is suitable for high-frequency resonance, filtering and temperature compensation circuits that require high capacity and stability. The national standard models are CC1 (low pressure) and CC81 (high pressure). At present, the commonly used temperature characteristic groups of our company are CH (NP0) and SL groups. The normal capacity ranges are as follows: The temperature coefficient αC=1/C (C2-C1/t2-t1) X106 (PPM/°C) in the table refers to the relative change rate of capacitance for every 1°C temperature change within the allowable temperature range. It can be seen from the above table that the temperature coefficient of the type 1 ceramic dielectric capacitor is very small, especially the CH characteristic, so the CH capacitance of the type 1 ceramic dielectric capacitor is often called a temperature compensation capacitor. However, due to the low dielectric constant of this type of ceramic material, its capacity value is difficult to increase. Therefore, when a capacitor with a higher capacitance value is needed, it can only be found in the 2 types of ceramic dielectric capacitors described below. 2. Low-frequency ceramic capacitors (also known as Class 2 ceramic capacitors) The ceramic material of this type of ceramic dielectric capacitor has a large dielectric constant, so the capacitor is small in size and wide in capacity, but the frequency and temperature characteristics are poor, so it is only suitable for those with low requirements for capacity, loss and temperature characteristics. The low frequency circuit is used as bypass, coupling, filtering and other circuits. The national standard models are CT1 (low pressure) and CT81 (high pressure), and their common temperature characteristic groups and normal capacity ranges correspond to the following: The temperature change rate rC/C in the table refers to the capacity change rate at the upper and lower limit temperature relative to room temperature +25°C. Among them, the 2R group is a low-loss capacitor. Because of its low temperature rise and better frequency characteristics, it can be used in higher frequency applications. For low-voltage ceramic capacitors, when the capacity is greater than 47000pF, you can only choose 3 types of ceramic capacitors (also known as semiconductor ceramic capacitors), for example: 26-ABC104-ZFX, but this type of capacitor has worse temperature characteristics and lower insulation resistance Low, just because of the high dielectric material, the volume can be made small. Therefore, it is only suitable for working circuits with lower requirements. If a larger capacity capacitor is selected, and there are higher requirements for capacity and temperature characteristics, then 27 types of organic film capacitors should be selected. 3. AC ceramic capacitor According to the requirements for the safe use of AC power supply, an AC ceramic capacitor with high insulation characteristics and high dielectric strength has been specially designed and produced in Class 2 ceramic capacitors, also known as Y capacitors, which are divided into Y1, Y2, The three major series of Y3 are classified as follows: 2. The packaging and dimensions of ceramic capacitors. Although ceramic capacitors have many of the above advantages, due to the low mechanical strength and fragility of the ceramic material itself, the geometric size of the wafer is limited. This is also the main reason why different temperature characteristics have different capacity ranges. Generally
Characteristics and selection of ceramic capacitors
(Summary description)Ceramic capacitors are currently the most widely used capacitors in electronic equipment, accounting for about 50% of the total number of capacitors used. However, due to the lack of understanding of their characteristics by many people, they lack due attention in use. In order to meet the standardization and standardization requirements of use, the following is an overview of the characteristics of ceramic capacitors and the matters needing attention in use:
1. Characteristic classification of ceramic capacitors:
Ceramic capacitors have the advantages of good heat resistance, excellent insulation, simple structure, and low price. However, the characteristics of different ceramic materials are very different and must be selected correctly according to the requirements of use. Ceramic capacitors are classified into high-frequency ceramic capacitors (Class 1 ceramic) and low-frequency ceramic capacitors (Class 2 ceramic) according to frequency characteristics; high-voltage ceramic capacitors (above 1KVDC) and low-voltage ceramic capacitors (below 500VDC) , Are described as follows:
1. High-frequency ceramic capacitors (also known as Class 1 ceramic capacitors)
The loss of this type of ceramic capacitor varies little with frequency in a wide range, and the high-frequency loss value is very small (tanδ≤0.15%, f=1MHz), and the maximum operating frequency can reach more than 1000MHz. At the same time, this type of ceramic capacitor has excellent temperature characteristics and is suitable for high-frequency resonance, filtering and temperature compensation circuits that require high capacity and stability. The national standard models are CC1 (low pressure) and CC81 (high pressure). At present, the commonly used temperature characteristic groups of our company are CH (NP0) and SL groups. The normal capacity ranges are as follows:
The temperature coefficient αC=1/C (C2-C1/t2-t1) X106 (PPM/°C) in the table refers to the relative change rate of capacitance for every 1°C temperature change within the allowable temperature range. It can be seen from the above table that the temperature coefficient of the type 1 ceramic dielectric capacitor is very small, especially the CH characteristic, so the CH capacitance of the type 1 ceramic dielectric capacitor is often called a temperature compensation capacitor. However, due to the low dielectric constant of this type of ceramic material, its capacity value is difficult to increase. Therefore, when a capacitor with a higher capacitance value is needed, it can only be found in the 2 types of ceramic dielectric capacitors described below.
2. Low-frequency ceramic capacitors (also known as Class 2 ceramic capacitors)
The ceramic material of this type of ceramic dielectric capacitor has a large dielectric constant, so the capacitor is small in size and wide in capacity, but the frequency and temperature characteristics are poor, so it is only suitable for those with low requirements for capacity, loss and temperature characteristics. The low frequency circuit is used as bypass, coupling, filtering and other circuits. The national standard models are CT1 (low pressure) and CT81 (high pressure), and their common temperature characteristic groups and normal capacity ranges correspond to the following:
The temperature change rate rC/C in the table refers to the capacity change rate at the upper and lower limit temperature relative to room temperature +25°C. Among them, the 2R group is a low-loss capacitor. Because of its low temperature rise and better frequency characteristics, it can be used in higher frequency applications.
For low-voltage ceramic capacitors, when the capacity is greater than 47000pF, you can only choose 3 types of ceramic capacitors (also known as semiconductor ceramic capacitors), for example: 26-ABC104-ZFX, but this type of capacitor has worse temperature characteristics and lower insulation resistance Low, just because of the high dielectric material, the volume can be made small. Therefore, it is only suitable for working circuits with lower requirements. If a larger capacity capacitor is selected, and there are higher requirements for capacity and temperature characteristics, then 27 types of organic film capacitors should be selected.
3. AC ceramic capacitor
According to the requirements for the safe use of AC power supply, an AC ceramic capacitor with high insulation characteristics and high dielectric strength has been specially designed and produced in Class 2 ceramic capacitors, also known as Y capacitors, which are divided into Y1, Y2, The three major series of Y3 are classified as follows:
2. The packaging and dimensions of ceramic capacitors.
Although ceramic capacitors have many of the above advantages, due to the low mechanical strength and fragility of the ceramic material itself, the geometric size of the wafer is limited. This is also the main reason why different temperature characteristics have different capacity ranges. Generally
- Categories:Company news
- Author:
- Origin:
- Time of issue:2020-04-09 14:26
- Views:
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