The main material is different media. Depending on the main polarization type of different media, the response speed and polarization rate of the electric field change are not the same. The capacity of the same volume is different, and the resulting capacitor dielectric loss, capacity stability and so on are different. Dielectric material in the capacity of the temperature stability can be divided into two categories, namely, Ⅰ class ceramic capacitors and Ⅱ class ceramic capacitors, NPO belongs to Ⅰ class ceramics, and other x7r, x5r, y5v, z5u, etc. belong to Ⅱ class ceramics.
What is the Ⅰ class ceramic, what is the characteristic?
Ⅰ class Ceramic capacitor (classⅰceramic capacitor), formerly known as high-frequency ceramic capacitors (high-frequency ceramic capacitor), the media using non-ferroelectric (CIS) formulations, TiO2 as the main component (dielectric constant less than 150) , thus having the most stable performance, or by adding a small number of other (ferroelectric) oxides, such as CaTiO3 or SrTiO3, to form an "extended" temperature-compensated ceramic, the approximate linear temperature coefficient is shown and the dielectric constant increases to 500. These two medium losses are small, the insulation resistance is high, the temperature characteristic is good. Ideal for use in oscillators, resonant circuits, coupling capacitors in high-frequency circuits, and other circuits requiring low losses and stable capacitance, or for temperature compensation.
How to express the temperature characteristic of Ⅰ ceramics
The temperature capacity characteristic (TCC) of Ⅰ Ceramics is very small, the unit is often in Ppm/℃, the change of capacity is much less than the base value of 1 skin method. The American Electronics Industry Association (EIA) standard uses the "letter + number + letter" code form to represent the Ⅰ ceramic temperature coefficient. such as the common c0g.
What is the temperature coefficient represented by the c0g?
C indicates a valid number of capacitance temperature coefficients is 0 Ppm/℃
0 means that the multiplier factor of a valid number is-1 (that is, 10 of 0 squares)
G indicates a tolerance with temperature variation of ±30ppm
The final TCC of the c0g capacitor is calculated as: 0x ( -1) Ppm/℃±30ppm/℃. and the corresponding other Ⅰ ceramic temperature coefficient, such as u2j capacitance, the calculation is: -750 ppm/℃±120 Ppm/℃.
are NPO and c0g the same kind of capacitance?
The NPO is the American military Standard (MIL) argument, actually should be NP0 (0), but generally everybody is used to write NPO (Europe). This is a shorthand for Negative-positive-zero, which is used to indicate the temperature characteristics. It is indicated that the capacitor temperature characteristic of NPO is very good, and the capacitance drift does not occur with the change of positive and negative temperature.
As we know from the front, c0g is the best temperature stability in class I ceramics, with a temperature characteristic of approximately 0 and satisfying the meaning of "negative-positive-0". So c0g in fact, and NPO is the same, but it is two standard two methods of expression (of course, the value of small, slightly less precision c0k, c0j, etc. are also NPO capacitors). Similarly, the u2j corresponds to the group code in the Mil standard as N750.
What is the Ⅱ class ceramic, what is the characteristic?
Ⅱ Ceramic capacitors (classⅱceramic capacitor) were formerly known as low-frequency ceramic capacitors (lower frequency ceramic capacitor), refers to the use of ferroelectric ceramics as a dielectric capacitor, so also known as ferroelectric ceramic capacitors. These capacitors are larger than capacitance, with a non-linear change in electrical capacitance with temperature, a large loss, often used in electronic equipment for bypass, coupling or for other low-loss and capacitance stability requirements of the circuit. Among them, the Ⅱ class ceramic capacitor is divided into stable grade and usable grade. X5R and x7r belong to Ⅱ class ceramics, while y5v and z5u belong to the available grade.
What is the difference between x5r, x7r, y5v, and z5u?
The difference is mainly in the temperature range and capacitance with temperature change characteristics. The following table indicates the meaning of these codes.
Take x7r as an example.
X represents the minimum capacitance to operate at-55 ℃
7 represents the maximum capacitance to work in +125℃
R indicates that the capacitance changes with temperature to ±15%
Similarly, the y5v normal operating temperature range in -30℃~+85℃, the corresponding capacitance change of +22~-82%, while the z5u normal operating temperature range in +10℃~+85℃, the corresponding capacitance change of +22~-56%.
What is the difference between NPO and x7r, X5R, y5v, z5u god horse?
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