ESD is the abbreviation of electrostatic discharge in English. The function of ESD is to prevent static electricity, so the capacitance value is relatively low. Moreover, this suppression diode has three pins that look like a thyristor, but in fact it is a diode, but these two diodes are connected in series. After that, the main function of the third lead is to release static electricity and protect other electronic components on the circuit board. The wiring on the circuit board is to be connected to the power pin, and the common end will be connected to the protection pin to achieve a better effect.

ESD anti-static diodes are mainly used to protect other electronic components, so the input capacitance of this port is still relatively small, and the capacitance is small and has a low trigger voltage, so it can be switched in the shortest time, thereby protecting the device. Usually this kind of diode will be in a parallel circuit. As long as it is working, it will form a higher resistance and form a cut-off state, which has no effect on the line. If there is any impact, unless the voltage of the circuit is abnormally high and reaches its breakdown voltage, we can see that this high resistance value immediately changes to a low resistance value to form a path for the current, and the high voltage can be controlled within a safe level, thereby protecting the CPU or the line. However, if the voltage abnormality disappears and the circuit can return to its original amputation state, then the circuit will work normally.
Through the above introduction, many people may have a deeper understanding of ESD diodes, that is, they are usually connected in parallel in the circuit and are three-corner headphone tubes. Under normal circumstances, they will not affect the normal operation of the circuit. It can only work when the voltage is abnormal to produce protective effects. When choosing an EsD diode, the parameters must be understood. Only when the breakdown voltage is greater than the maximum operating voltage of the line can it play a protective role. This effective function of preventing static electricity has replaced the previous varistor. In the manufacturing process of electronic components, this kind of electrostatic protection is also very important, and its performance will be more significant.

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