When purchasing chip capacitors, not only need to pay attention to the brand, but also to pay attention to whether it meets the actual requirements of the parameters, because it is necessary to ensure that the parameters meet the actual requirements in order to ensure the performance. For the parameters, the more important is the withstand voltage value. Only by accurately identifying the withstand voltage value can a reliable capacitor be selected. So how to identify the withstand voltage value?
The first thing that needs to be understood is the identification method of the capacitor. The direct standard method is commonly used, that is, if the number is 0.001, then it represents 0.001uF=1nF, if it is 10n, then it is 10nF, and 100p is 100pF. Of course, there is also a direct representation method that does not mark the unit. It uses 1 to 4 digits and the capacity unit is pF. For example, 350 is 350pF, 3 is 3pF, and 0.5 is 0.5pF.
Secondly, there is color code notation. Along the direction of the capacitor lead, different colors are used to indicate different numbers. The first and second rings indicate the capacitance, and the third color indicates the number of zeros after the effective number (in pF). Color meaning: black=0, brown=1, Red==3, yellow=4, green=5, blue=6, purple=7, gray=8, white=9.
Ceramic chip capacitors include high-voltage ceramic and ordinary ceramic capacitors. The standard withstand voltage used to be 50V, and the high voltage has several hundred volts and several thousand volts. Generally, XXKV is marked under the capacitance value. 1J stands for 6.3×10=63V; 2F stands for 3.15×100=315V; 3A stands for 1.0×1000=1000V; 1K stands for 8.0×10=80V.
There are also two common methods for labeling the withstand voltage of chip capacitors. One is to print the withstand voltage directly on the capacitor, and the other is to use a combination of a number and a letter.
Through the above identification method, do you know what the withstand voltage value of the ceramic capacitor is? In fact, as long as you can accurately grasp the relevant signs, you can easily judge the withstand voltage value based on the signs. Different representation methods mean different things, so this is basic common sense that cannot be ignored.