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May 2006

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Thu, 11 May 2006 10:18:24 -0400
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My disclaimer... I'm a neophyte at SMT and need some education.
 
Fiducials;
At what point do I need fiducials on my boards?
 
Is there a specific pitch or device size that will require fiducials?
 
Is there a "Cliff's Notes" for this?
 
Thermal Stitching;
We have an SMT power transistor that has about 16 thermal stitch holes
located directly under the device.  The adjacent pad area is taken up by
heat sink.  Is this "industry standard"?
 
Short of reading all the IPC standards... zzzzzzzz... oh sorry, I dozed
off there, is there a good source for coming up to speed on SMT and
board layout good standards?
 
Thanks in advance,
 
Phil Nutting

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