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December 2011

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Subject:
From:
"Gumpert, Ben" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Gumpert, Ben
Date:
Wed, 14 Dec 2011 09:50:19 -0500
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Pete,

From a stencil designer standpoint, I would MUCH rather that the footprint have the correct paste layer design in the library. The fewer modifications that manufacturing engineering has to make the better. And why not make a change once instead of every single time a footprint is used.

Of course that means that manufacturing has to know what they want when the footprint is being created, which isn't always the case. 

Ben


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete
Sent: Wednesday, December 14, 2011 9:13 AM
To: [log in to unmask]
Subject: EXTERNAL: Re: [TN] TI Paste Recommendations

William, there's been some great information on QFNs posted in this thread, they are different than most SMT and it's good to know as much as you can about the assembly issues.  

But from  a CAD library standpoint, do you really need to define the paste footprint?  Do you build home plate apertures into your 0603 footprints?  There's a very good chance that manufacturing engineering is making quite a few modifications to your paste mask gerber file anyway.  Check with them, they might prefer you just give them a gerber file that matches the pad shapes, and they will apply their expertise from there.

Now, via placement in and around the QFN, sodlermask apertures - those you need to be concerned with in your design.  The Desginers Council Listserver had a discussion about some of this in the October archive.

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