The capacitor works reliably for a long time. The maximum DC voltage it can withstand is the withstand voltage of the capacitor, also called the DC operating voltage of the capacitor. If in an AC circuit, be aware that the maximum applied AC voltage must not exceed the DC operating voltage of the capacitor. Therefore, the choice of withstand voltage value is a detail that cannot be ignored. Let's take the Samsung brand as an example.
There are various indications for the withstand voltage of a capacitor. For example, if the number is 0.001, it represents 0.001uF=1nF, if it is 10n, then it is 10nF, and the same 100p is 100pF.
The unit of non-standard unit is directly represented by 1~4 digits, and the unit of capacity is pF, such as 350 is 350pF, 3 is 3pF, and 0.5 is 0.5pF.
Secondly, the color code indicates the withstand voltage value, and different colors are used to indicate different numbers along the direction of the capacitor lead. First, the two types of rings represent the capacitance, and the third color represents the number of zeros after the effective number (in units pF) Color meaning: black=0, brown=1, red=2, orange=3, yellow=4, green=5, blue=6, purple=7, gray=8, white=9.
Of course, there is also a series of capacitive withstand voltage representations. One of the capacitor withstand voltage values is represented by 1 digit and 1 letter, such as 2G472J, the first two 2G is the withstand voltage, the latter is known to indicate the capacity and error, there are two common methods for marking the capacitor withstand voltage. One is to print the withstand voltage directly on the capacitor, and the other is to combine a number and a letter.
The number represents a power exponent of 10, and the letter represents a numerical value in units of V (volts). 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; the maximum number is 4, such as 4Z stands for 90,000V.
