Both actually :-)
 
The board designer makes an SMT stencil layer with apertures for all the SMT components.
The designer knows were all the SMT components are, so, while they are designing all the other
layers, they may as well design a the paste layer.
 
The contract manufacturer then reviews that stencil/paste layer and may or may not make modifications OR
they may have the stencil house that fabs the stencil make modifications.  Such modifications may
include a reduction or expansion of the aperture size, or, exclusion of components due to process
constraints.
 
-Carrie

-----Original Message-----
From: Donald Kyle [mailto:[log in to unmask]]
Sent: Tuesday, January 14, 2003 9:33 AM
To: [log in to unmask]
Subject: [TN] Stencils


I would like your opinion on who would be more suited to 
design stencils for SMT PWBs; the board designer or the 
contract-manufacturing engineer.

What do you do and why?




Donald Kyle C.I.D.+ 
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