Alex:
        Electro Static Discharge ( ESD) is a miniature lightening that could
be up to 20,000 volts high. It is said that lightening does not hit the same
place twice, but when, in the case of a board, it affects the same part, it
could completely demolish what it did not do the first time. So It could be
accumulative.
        Regards,
        Ramon

> -----Original Message-----
> From: Alex Krstic [SMTP:[log in to unmask]]
> Sent: Thursday, October 02, 2003 6:45 PM
> To:   [log in to unmask]
> Subject:      [TN] Cumulative damage from ESD
>
>
>
> Hi all.  Simple question yet I haven't read the definitive answer.  Is
> damage from ESD cumulative?  Reason I ask is the following statement I
> came across in a GaAs MMIC article.
>
> "Other studies have also concluded that damage from repeated exposure to
> an ESD level is not cumulative and that noncatastrophic damage does not
> degrade device lifetime."  The statement references the EOS/ESD Symposium
> Proceedings 1988.
>
> I've always preached that ESD damage is cumulative.
>
> Alex "Shocked" Krstic
> NovAtel Inc.
>
>
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