Still a bit vague on the part number question, by your answer do you mean:

1.) Same part number at different part locations.

2.) Completely different parts and unrelated parts ( by this I would even
wonder if the different parts were from the same manufacture.

Are you gluing any of the parts that are breaking in place?

Do these specific parts have a via underneath them and specifically a
"tented" via?

Have you tried simply placing a few of the parts on a cookie sheet or piece
of FR4 and "cooking" them to see if possibly they have some moisture trapped
inside them (or is this just a dumb idea)?

JaMi Smith


----- Original Message -----
From: "Virgil Lenton" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, January 16, 2003 10:43 AM
Subject: Re: [TN] Cracking SOT-23


> I apologize for the vagueness in my original posting.
> This is what we know so far about this problem.
>
> - It does not appear to be Z-height related - nozzles are spring loaded
and
> we have double checked.
> - Breaks are complete breaks through the center of the body. Sometimes
> the 'lid' comes off, but most often they crack top to bottom right
through.
> - We have *not* explored the possibility of moisture, but at this pont we
> feel moisture is unlikely.
> - The components in question are all placed on pass 1. We havent yet
> checked to see if they are cracked before pass 2.
> - It is not always the same part, but always SOT-23.
> - The profile used is our 'standard' profile that has been used for about
3
> years.
>
> Regards
> Virgil
>
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