Joe,
I would suggest you go to the IPC website, there are some free downloads of
land pattern calculators. You also should get a copy of the 2220 - IPC
2220 Design Standards Series.
And also you will need SM-782A - Surface Mount Design & Land Pattern
Standard, Inc. Am. 1 & 2.
For Thru hole sizing.. I use this spreadsheet that you can download from my
website.
http://www.geocities.com/kingpcb1961/downloads/
look for this book for reference also....
Coombs' Printed Circuits Handbook
by Clyde F. Coombs
http://www.amazon.com/exec/obidos/tg/detail/-/0071350160/qid=1107823171/sr=8-2/ref=sr_8_xs_ap_i1_xgl14/002-5172001-2316849?v=glance&s=books&n=507846
Good luck,
Karl
From: Joseph Matthews <[log in to unmask]>
Reply-To: "(Designers Council Forum)" <[log in to unmask]>,
Joseph Matthews <[log in to unmask]>
To: [log in to unmask]
Subject: [DC] Designing PCB footprints
Date: Mon, 7 Feb 2005 15:49:53 -0800
Greetings,
As a hardware engineer I have been tasked with laying out my first real
circuitboard in years (first *real* board I guess). It's proved a bear.
With years of experience designing hardware I am totally unprepared for the
leap from the "logical" into the "physical" at this stage in my career. No
less, I am under a crunch (as we all are, right?) and this being a fairly
simple board, I figured it's time I dove in and learned...Simply stated, I'm
stumped. Where can I find a comprehensive, clearly defined explaination on
how to create *quality* PCB footprints and/or what the terms are used by the
Footprint calculator made by PCB Libraries. I see all of these fields to
enter information but I'm not sure what these mean and how to translate
what's on the datasheet to these fields.
I have read through a few of the IPC standards (some of the 122x stuff) and
still can't say I undertsand much more of what's required. Is there a more
comprehensive standard or something that more clearly deliniates, "do
this...don't do this"...or, "if the pad is this big on the datasheet, add
n%". These standards seem fairly high-level and at times seem almost
circular. No less, they are not totally specific and I'm not sure where I
can get the very specific information. I of course am aware that there's
probably more to it than simply adding a bit here or a bit there, but
assuming I know nothing, can someone offer some straight-forward advice on
how to build up a board. Nothing fancy, just the basics. I should be smart
enough to take it from there.
I hate to inundate people with how-to's but everything I've read, including
a book on the fundamentals of PCB layout seems very high-level and seem
almost afraid to say anything for certain.
Thanks for your help.
Joe
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