28. GDT Applications

Question.4

GDT connected for surge protection. Despite GDT’s massive surge capability, the design also includes a small TVS diode downstream.
Why does this design include- TVS Diode?

GDt-Connection-digram-with-TVS-Diode-Protection

The TVS provides backup in case the GDT physically fails open
The TVS handles the initial fast transient because the GDT takes microseconds to fire — during that delay, the IC is unprotected
The TVS reduces the capacitance seen by the data line
The TVS limits the continuous current through the GDT to prevent follow current

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