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Pins too tight

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Footprints / Land Patterns
Forum Description: [General or a CAD specific issues / discussions]
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=677
Printed Date: 12 Oct 2024 at 7:29pm


Topic: Pins too tight
Posted By: budnoel
Subject: Pins too tight
Date Posted: 12 Nov 2012 at 12:47pm
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Hello. Using IPC density level C (Least) for the padstacks associated with pins 13-16 of the enclosed connector footprint I find less the 5mils of clearance between pads. (4.8mils)  I had to make the pad even smaller than what Level C recommended (c140h90)  Any comments?


Replies:
Posted By: DaveCowl
Date Posted: 12 Nov 2012 at 5:02pm
You are not alone. I have a similar issue with a mini DisplayPort connector. You can't space 1mm pads 1mm apart. I don't have a good answer for this problem but think that pad clearance is probably more important than annular ring...?!

Posted By: Tom H
Date Posted: 13 Nov 2012 at 7:45am
Whenever the pin pitch and the hole size conflict with the design rules, I use an oblong pad shape with a minimum pad on the sides and accept drill breakout on the sides (if it happens).
 
I never had any manufacturing problems when using this technique. Sometimes you have to think outside the box. We'll have to introduce this pad shape to the through-hole calculator in V2013.
 


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