I have definitely seen this at the prototype/NPI stage of a product
development - circuit layout error, but we have 10 or 50 boards in house we
need to use...  When things go to regular production, however, these things
need to get cleaned up because the labour involved to do that regularly is
too much.  We have not done reliability studies on these type of things
because usually proto's are just built for evaluation, and not for long term
service.

-----Original Message-----
From: Bissonnette, Jean-Francois [mailto:[log in to unmask]]
Sent: February 18, 2005 9:25 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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