Issues to Pay Attention to in the Application of TVS Diode

Issues to Pay Attention to in the Application of TVS Diode

The relationship between the absorbed power (peak) of transient voltage and the pulse width of transient voltage. For the maintenance of small current loads, it is advisable to add a current limiting resistor to the line. As long as the resistance value of the current limiting resistor is appropriate, it will not affect the normal operation of the line. However, the current generated by the disturbance caused by the current limiting resistor will be greatly reduced. This makes it possible to choose TVS transistors with lower peak power for maintenance of low current load lines.

It is particularly noteworthy whether the steady-state average power of the TVS transistor is within the safe range to suppress the repetitive transient voltage.

As a semiconductor device,TVS Diode should pay attention to the issue of derating when the ambient temperature rises. Pay special attention to the lead length of the TVS Diode and its relative spacing with the line being maintained. When there is no suitable voltage TVS Diode available for use, it is allowed to use multiple TVS Diode in series. The maximum current of a series diode is determined by the one with the smallest current absorption capacity in the diode used. The peak absorption power is equal to the product of this current and the voltage of the series  transistor.

The junction capacitance of TVS transistor is a key factor affecting its application in high-speed lines. In this case, a TVS transistor is generally connected back to back with a fast recovery diode, as the fast recovery diode has a smaller junction capacitance, so the equivalent capacitance of the two in series is also smaller, which can meet the requirements of high-frequency applications.

Various electronic systems and communication networks are often subject to external electromagnetic disturbances, mainly from transient processes of power lines, lightning strikes, and world radio. These disturbances can lead to system errors and even hardware damage. To address these issues, comprehensive preventive and maintenance measures should be taken, and the planning and selection of appropriate silicon transient absorption diodes is a good plan for dealing with transient disturbances. But as the electronics industry explores more electronic products that improve efficiency, add functionality, and continuously improve integration, planning to provide a complete circuit maintenance processing plan will constitute another innovation in circuit maintenance skills.