[SI-LIST] Re: ESD failure - need advise

  • From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
  • To: "n.rameshhwde@xxxxxxxxx" <n.rameshhwde@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
  • Date: Fri, 26 Sep 2014 21:12:00 +0000

Hello Ramesh - Your best bet is to prevent the discharge from occurring in
the first place.  Unless the addition of insulation barriers will affect your
cooling, I suggest you either block the airgaps in the tool (i.e remove 
the holes) or add  insulation over the board area that is affected.

Best Regards
Charles Grasso
Compliance Engineer
Echostar Communications
(w) 303-706-5467
(c) 303-204-2974
(t) 3032042974@xxxxxxxxx
(e) charles.grasso@xxxxxxxxxxxx
(e2) chasgrasso@xxxxxxxxx


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of Ramesh N
Sent: Tuesday, September 23, 2014 4:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ESD failure - need advise

Hello Experts,
Greetings!!!
we are having ESD fail (in regulatory testing) in one of our design.
It's simple wireless DAQ system with 2 boards [controller PCB + LED/Sensor 
PCB]. FPC cable (5") is used as interconnect.Package is abs plastics.
Light-pipe is used for the for led indication. When +8kV is applied through air 
discharging, inadvertent LED trigger occurs . Randomly, system is also hanging 
when multiple zapping applied (especially for 8kV voltage level).
I have tried to limit airgaps, added filter caps, etc but issue is not entirely 
solved.

Is there any ESD simulation/analysis tool available for addressing this failure 
analysis?
Any help/debug tips related to this would be very helpful.

Thanks and regards,
Ramesh


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