无极电容（Electrodeless capacitor）.doc

无极电容（Electrodeless capacitor） Black, brown, red, orange, yellow, green, blue, purple, grey, white Http:///more.asp? Name=xinjihuaid=37299? Capacitance of dielectric material for NPO, X7R and Y5V: 1, NPO is a kind of ceramic dielectric and electrical properties are stable, and basically does not change with temperature, time and voltage change, applicable to a strict situation on the stability and reliability requirements, the electrical performance is stable, the DF value is very small, can work well in high frequency, UHF, VHF band; 2, X7R is two kinds of ceramic dielectric, electrical performance is stable, the temperature, time and voltage, its characteristics change is not obvious, suitable for high coupling, bypass, filtering circuit and the frequency of 10 MHz; 3, Y5V is two kinds of ceramic dielectric, with high dielectric coefficient, commonly used in the production of small volume, large capacity capacitor, its capacity with temperature change more obvious, but the cost is relatively low, is still widely used for capacity loss does not require high coupling, filtering and bypass circuit field. The 4 and Z5U capacitors are called universal monolithic ceramic capacitors. The first thing to consider here is the use of temperature range, for Z5U capacitors, mainly because of its small size and low cost. For the above three ceramic monolithic capacitors, the Z5U capacitor has the largest capacitance in the same volume. But its capacitance is greatly affected by environment and working conditions, and its aging rate can reach up to 5% every 10 years. The main difference between NPO, X7R, Z5U, and Y5V is that their fill media are different. In the same volume, the capacity of the capacitor is different because of the different filling medium, and the dielectric loss, capacity stability and other factors of the capacitor are different. Therefore, when using capacitors, different capacitors should be chosen according to the different roles of the capacitor in the ci