Bi-directional Diode for ESD 1

[djkok]

How the bi-directional Doide with Zener voltage 5~7V can solve the ESD problem?Pls advise

 

[VEBill]

I read somewhere that, for ESD protection, the junction capacitance of the zener can help as much, or more, than the zener effect itself.

 

[itsmoked]

Only in certain cases would it help. If the circuitry can deal with the -7V aspect... um perhaps an OPAMP that normaly runs +/- 5V?

 

[Comcokid]

A static discharge to a I/O line may be either positive or negative with a fast rise-time. Bi-directional ESD diodes clamp the discharge so the voltage on the I/O does not exceed the 5~7V to ground. This is usually sufficient to protect any semiconductor device, even if it has a lower voltage VCC. ESD diodes are quick acting which also means they have a low junction capacitance - this also reduces any affect the presence of the diode may have on a digital I/O signal.