What I have seen in such a case was:
-case cracks
- bond wires separation from leads
-bad solder joints - usually the toe cut is done upwards and the burrs and
bare base material are above the solder joint in normal soldering.
My 2 cents
Gaby
----- Original Message -----
From: "Bissonnette, Jean-Francois" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 18, 2005 5:51 PM
Subject: Re: [TN] Flipped transistor?
> "....Print takes Precedence." Scary isn't it?!
>
> My eyes DID blink as my jaw dropped... as far as I know this is not for
prototype.
>
> Thanks!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Morse, Carrie
> Sent: Friday, February 18, 2005 10:30 AM
> To: [log in to unmask]
> Subject: Re: [TN] Flipped transistor?
>
>
> We see all sorts of "special rework" that our customers request. Although
the design of the rework may not be the most robust or the most "IPC
Correct", the bottom line is that the Print takes Precedence. Typically,
when I see something like this, I blink my eyes a few times, shake my head,
and document the info on a DFM report with my recommendations. The only
time something is really a "NO NO" is when the customer says "NO NO".
>
> -Carrie
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Bissonnette,
Jean-Francois
> Sent: Friday, February 18, 2005 10:25 AM
> To: [log in to unmask]
> Subject: [TN] Flipped transistor?
>
> Here is a first for me!
>
> Before I go ruffling some feathers I would like to have others opinion.
I've just been informed of a modification on a boards that requires to
install a SOT23 NPN transistor to be fliped on its back in order to be
soldered. The poor leads are then bent backward to contact with the board's
lands of some other component.
>
> Engineering did not raise a flag on that yet... I'm worried to say the
least because I'm convinced that this is a NO NO!
>
> Anyone has seen that in the past?
>
> Thanks!
>
> Jean-François
>
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