2023-07-12
VS What is a transient suppression diode? TVS transient suppression diode is a device used to protect a circuit from transient voltage interference. It can play a role similar to a fuse in the circuit, when there is too high voltage in the circuit, it will be quickly switched on, and the excessive voltage will be guided to the ground wire, so as to protect other components in the circuit from damage. Today, Liyang Semiconductor and you to talk about the role of TVS transient suppression diode and selection precautions!
The role of TVS transient suppression diode
The TVS diode is added to the signal and power line to prevent the microprocessor or microcontroller from failing due to instantaneous pulse, such as electrostatic discharge effect, AC power surge and noise caused by switching power supply.
Electrostatic discharge effect can release more than 10000V, more than 60A pulse, and can last 10ms; The general TTL device, when encountered more than 30ms of 10V pulse, will lead to damage. With TVS diodes, the pulse that can cause device damage can be effectively absorbed and interference caused by switching between buses can be eliminated (Crosstalk).
The TVS diode is placed in the signal line and ground to avoid unnecessary noise on the data and control bus.
Second, TVS transient suppression diode selection precautions
1, the specification manual gives only the peak absorbed power under the specific pulse width, and the pulse width in the actual circuit is variable, there must be a number in the mind, and the wide pulse should be derated;
2, for the protection of small current load circuit, it is necessary to consciously increase the current limiting resistance;
3, pay attention to whether the steady-state average power of TVS diode is in the safe range;
4, to consider the temperature change, normally speaking, the transient suppression diode works between -55°C and 150°C, the circuit temperature is relatively high to derate the application;
5, TVS transient suppression diode lead length, to be relative to the protected line. 6) For the protection of data interfaces or communication lines, TVS diodes with relatively small capacitance values should be selected as far as possible.
6, DC protection circuit mostly choose one-way TVS tube, AC protection circuit mostly choose two-way TVS tube, multi-channel protection circuit choose TVS array device, high-power protection circuit choose special protection module.
7, in the process of using TVS tube, considering the discreteness of TVS, try to reduce the number of string/parallel.
The above content is about the role of TVS transient suppression diode and the selection of notes related to the introduction, want to know more can consult the website customer service, Liyang Semiconductor wholeheartedly at your service!
