ESD principle of TVS diode

Static electricity is a natural phenomenon and can be generated in various ways, such as contact, friction, and mutual induction between electrical appliances. It has the characteristics of high voltage, low battery, small current and short action time.
Static electricity can generate several thousand volts or even tens of thousands of volts of static electricity, which can cause serious harm in many fields. It is also extremely unstable and even damaged in the operation of electronic products.




Electrostatic protection is very important for high-density, small and complex electronic products, especially some FMCG and portable electronic products on the market have strict requirements on the area of ​​the motherboard and are easily affected by electrostatic discharge. Some use more complex semiconductor functional circuits, which are more sensitive to the influence of transient processes, which will lead to more serious electrostatic problems.
Circuit protection components should be determined based on the wiring to be protected, board space, and the characteristics of the circuit being protected. One of the important factors is the clamping voltage of the device. The clamping voltage is the voltage across the tvs in the esd device, which is the protected strain voltage.
Many protection components can be designed to absorb large amounts of energy and also have high clamping voltages due to meta-structural or design reasons. Since the clamping voltage of the varistor is too high to provide effective esd protection. In addition, since the high capacitance of the varistor cannot provide protection for high-speed data lines, the tvs diode is the key component to solve this problem.
TVS diodes are specially designed to absorb esd energy and protect from esd electrostatic damage. During circuit board layout, the wire length before TVS layout should be minimized, because fast pulses may cause TVS protection capabilities to decline.

Post time: Aug-23-2022