The severity of a life test depends on the field environment. I work in
automotive powertrain. Our standard design validation of 85/85 for 1000hrs
may not even be severe enough to simulate underhood conditions for 10
years/150,000 miles.

----------
> From: SIRGuru <[log in to unmask]>
> To: [log in to unmask]
> Subject: Re: [TN] Re[2]: [TN] SIR Reading
> Date: Thursday, January 08, 1998 9:43 AM
>
> In a message dated 98-01-06 21:08:26 EST, you write:
>
> >   Is it a normal practice to run the SIR test for 40 days (1000hr)? Is
> >   so, usually after how long do you see a decrease in SIR?
>
> It depends on what you consider normal.  I know that many companies do
1000
> hour tests as a "life" test.  Bellcore electromigration is 500 hours at
85/85,
> which is the longest "SIR" type of test that is commonly run in our lab.
In
> my own opinion, I don't consider an SIR test longer than 10 days at 85/85
to
> be particularly meaningful.  If you are testing at lower extremes, say
35/90,
> then you may be able to go longer and still get meaningful results.
Whether
> or not you see a decrease in SIR depends on a number of factors,
primarily the
> types of ionic or hydrophilic contaminants.
>
> Doug Pauls
> CSL
>
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