[sdiy] JFET input protection

[Antti Huovilainen]

On Tue, 20 Apr 2010, Scott Nordlund wrote:

> ESD is typically a very small charge at high potential.

> A JFET has quite high gate impedance, so very high voltages can build up 
> and ruin things.

Yes, when you discount the parasitic gate->source diode. What if you take 
it into account, though?

What happens in a jfet once the breakdown voltage is exceeded? Is it 
simply the high current that destroys the device or is any "significant" 
current enough to permanently damage it?

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova