On 14 Dec 2011 at 9:31, Jack Olson wrote:

> That's my experience, too....
> As a designer or librarian, UNLESS you are responsible for creating
> your own paste screens (not the starting paste screen data file, the
> actual finished Paste Screen), it is probably better to make the paste
> screen apertures match the land sizes. 

I agree to both.. (making special paste screen AND making 1:1). It 
depends. Most "standard" stuff works fine with 1:1 and reduction by 
the stencil shop according to assembly house request; no need to 
think about for the librarian at all.

If I use QFNs, (µ)BGAs, or other special stuff with big pads, heat 
sinks etc., then I try to contact the technicians who are responsible 
for assembly and ask for their recommendations. Not so easy to get in 
contact with assembly houses as I am "only" the external design 
bureau, additional work for the librarian (usually me :-) ), 
additional documentation, library variants...

Best regards
Matthias Mansfeld

--
Matthias Mansfeld Elektronik
* Printed Circuit Board Design and Assembly
Neithardtstr. 3, D-85540 Haar, GERMANY
Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
E-Mail: [log in to unmask]
Internet: http://www.mansfeld-elektronik.de


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