2021-06-16
Transient voltage suppression diode is a high-efficiency protection device in the form of diode, when the poles of the TVS diode are subjected to reverse transient high energy impact, it can change the high impedance between the poles into low impedance at a speed of 10 to the minus 12 seconds, absorbing up to several kilowatts of surge power, so that the voltage clamp between the poles is located at a predetermined value. Effectively protect precision components in electronic circuits from damage caused by various surge pulses. In the selection of transient suppression diode, I believe that many people do not understand this, today Liyang Semiconductor is also sorted out some of the transient suppression diode selection of some skills to share with you, next let us take a look at the detailed introduction.
Seven tips for transient suppression diode selection:
1, determine the maximum DC or continuous operating voltage of the protected circuit, the rated standard voltage of the circuit and the "high-end" tolerance.
2, the rated reverse shutdown VWM of the transient suppression diode should be greater than or equal to the maximum operating voltage of the protected circuit. If the selected VWM is too low, the device may enter an avalanche or affect the normal operation of the circuit due to too much reverse leakage current. Serial connection sub-voltage, parallel connection sub-current.
3, the maximum clamping voltage of the transient suppression diode VC should be less than the damage voltage of the protected circuit.
4, in the specified pulse duration, the maximum peak pulse power of the transient suppression diode PM must be greater than the peak pulse power that may occur in the protected circuit. After determining the maximum clamping voltage, the peak pulse current should be greater than the transient surge current.
5, for the protection of the data interface circuit, attention must also be paid to the selection of a transient suppression diode device with a suitable capacitor C.
6, according to the use of the transient suppression diode polarity and packaging structure. It is reasonable to choose bipolar transient suppression diode in AC circuit. It is more advantageous to choose transient suppression diode array for multi-line protection.
7, temperature consideration. Transient voltage suppressors can operate between -55 and +150. If the transient suppression diode is required to operate at a changing temperature, its reverse leakage current ID is increased with increasing; The power consumption decreases with the increase of the junction temperature of the transient suppression diode, from +25 to +175. The rain breakdown voltage VBR decreases linearly by about 50% with the increase of temperature by a certain coefficient. Therefore, it is necessary to consult the relevant product information and consider the impact of temperature changes on its characteristics.
The above content is a detailed introduction to the guide for the selection of transient suppression diodes. After reading it, I believe that everyone has a certain understanding of it. Later, if you want to know more about the relevant content of transient suppression diodes, you can continue to pay attention to Liyang Semiconductor or information website customer service to learn more!
