What is a class of ceramic capacitors, a class of ceramic capacitors

A temperature compensated NPO COG capacitor. 
NPO is one of the most commonly used monolithic ceramic capacitors with temperature compensation characteristics. Its filling medium is composed of rubidium, samarium and some other rare oxides. NPO capacitor is one of the most stable capacitors with the most stable capacitance and dielectric loss.When the temperature is from -55 ℃ to + 125 ℃, the capacity changes to 0 ±30ppm/ ℃, and the change of capacitance with frequency is less than ±0. 3 Δ C. The drift or hysteresis of NPO capacitor is less than ±0.05, which is negligible when the capacitance is larger than ±2%. The variation of typical capacity relative to service life is less than ±0.1%. The capacitance and dielectric loss of NPO capacitors vary with frequency according to the packaging form. The frequency characteristics of large package size are better than that of small package size. 

NPO capacitors are suitable for oscillator, resonator slot capacitors and coupling capacitors in high frequency circuits. 

Two high dielectric constant type X7RN R7) capacitors. 

X7R capacitors are called temperature stabilized ceramic capacitors. When the temperature ranges from -55 ℃ to + 125 ℃, the capacity of the capacitor changes to 15. It is important to note that the change of capacitor capacity is nonlinear at this time. The capacity of X7R capacitor is different under different voltage and frequency, and it also changes with time, about 1% Δ C is changed every 10 years, and the change is about 5% in 10 years. X7R capacitors are mainly used in industrial applications with low requirements, and their capacity changes are acceptable when the voltage changes. Its main feature is that at the same volume of capacitance can be done relatively large. The capacity range of the X7R capacitor is given in the following table. 
X7R capacitor is suitable for decoupling and smoothing. There are 250V, 630V, 1000V, 2000V and other varieties of pressure. 

Three High dielectric constant Type Y5V characteristic Capacitor. 

Y5V capacitors are general-purpose capacitors with certain temperature limits. The capacity of Y5V capacitors varies from 22% to -82% in the range of operating temperature from -30 ℃ to 85 ℃, and the dielectric loss is 5%. The high dielectric constant of Y5V allows the fabrication of capacitors of up to 100 μ F at a relatively small physical size. 
Y5V capacitor is suitable for decoupling and smoothing. 

At present, the rapid development of the electronic industry, ceramic capacitors and Y capacitors are extremely widely used, a variety of electronic equipment, household appliances, power supply needs to be used. Electronic products are closely related to our safe life, so it is very important to choose ceramic capacitors of good quality.