PMOS Gate,Source,Bulk connected together

[kevinlin]

I have seen a circuit that PMOS Gate,Source,Bulk connected together is about 4v,the drain is another terminal about 1.4v,like below,who can tell me what function this circuit play a role in.It seem that PMOS has been closed,and body diode is reverse biased,but it do some thing i am sure.thank you!

 

[erikl]

Could be a dummy or spare transistor. Otherwise: show its environment!

 

[michaeljackson]

It is an ESD device.

 

[snafflekid]

But a PMOS ESD device? An NMOS would snap back on an ESD strike, but would a PMOS protect as well?