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What is the use of semiconductor discharge tube? Semiconductor discharge tube manufacturers say
What is the use of semiconductor discharge tube? Semiconductor discharge tube manufacturers say.
Semiconductor discharge tube manufacturers say that in the protection device, it is characterized by large current, slow response time and high impulse breakdown voltage. TVS diode has small flux, fast response time and good voltage clamping characteristics. The characteristics of the varistor are between the two; the semiconductor discharge tube conduction and breakdown voltage is accurate, the reaction speed is fast, less than 1ns. When a protection circuit requires a large total current and can achieve fine protection, the protection circuit often needs the cooperation of these protection devices to achieve the ideal protection characteristics. What is the use of semiconductor discharge tube? Semiconductor discharge tube manufacturers say.
Semiconductor discharge tube manufacturers say, semiconductor discharge tube is a kind of overvoltage protection device, is made of thyristor principle. It relies on the breakdown current of the PN junction to trigger the device to turn on the discharge, and can flow a large surge current or pulse current. The range of its breakdown voltage constitutes the range of overvoltage protection. When in use, the solid discharge tube can be directly connected across the two ends of the protected circuit.
When the overvoltage across the TSS tube exceeds the breakdown voltage, the TSS tube will clamp the overvoltage at a level below the breakdown voltage, close to 0V, and then the TSS tube will maintain this short circuit state until the overcurrent flowing through the TSS tube drops below the critical value, and then the TSS will return to the open circuit state.
TSS is suitable for protecting signal lines with high signal levels:
Semiconductor discharge tube manufacturers say that TSS tubes have the same characteristics as TVS tubes in terms of response time and junction capacitance. It is easy to make a surface mounted device, which is very suitable for single board use. After the TSS tube operates, the overvoltage is pulled down from near the breakdown voltage to a level close to 0V. At this time, the junction voltage drop of the diode is very small. Therefore, when used to protect lines with higher signal levels (such as analog subscriber lines, ADSL, etc.).), The current is larger than the TVS tube, and the protection effect is better than the TVS tube.
TSS tube is mainly used for lightning protection of signal line;
Semiconductor discharge tube manufacturers said that one problem that needs to be paid attention to when using TSS tubes is that after the TSS tube breaks down under overvoltage, the TSS tube will return to an open circuit state after the current value flowing through the TSS tube falls below a critical value. Therefore, when the TSS tube is used in the signal line, the normal current of the signal line should be smaller than the critical recovery current of the TSS tube. The critical recovery current value varies with the type and design application of the TSS tube. When using, attention should be paid to find out the exact value of the specific model used in the equipment manual.
The breakdown voltage (min(UBR)) and current capacity of the TSS tube should be considered in the circuit design. In the signal loop, there should be: min (UBR) (1.2~1.5) Umax, where Umax is the peak voltage of the signal loop.
The failure mode of TSS tube is mainly short circuit. However, when an excessive overcurrent is passed, explosion and disconnection may also be caused.
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