https://www.PCBLibraries.com/forum/ Mon, 20 Apr 2026 19:37:42 +0000 Fri, 06 Jan 2017 04:52:49 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2044 https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ https://www.PCBLibraries.com/forum/spacing-of-adjacent-holes_topic2044_post8431.html#8431 Author: Matthew Lamkin
Subject: 2044
Posted: 06 Jan 2017 at 4:52am

The values are the same in the rev B standard.
]]> Fri, 06 Jan 2017 04:52:49 +0000 https://www.PCBLibraries.com/forum/spacing-of-adjacent-holes_topic2044_post8431.html#8431 https://www.PCBLibraries.com/forum/spacing-of-adjacent-holes_topic2044_post8378.html#8378 Author: Gary K
Subject: 2044
Posted: 21 Dec 2016 at 12:08pm

IPC-2221A 9.2.7 states that the "residual laminate material" be no less than 0.50 mm (20mil).

This translates into hole to hole clearance, or hole to hole spacing.

I don't have access to IPC-2221B which is the current rev as of November 2012.

Can someone post whether the value has changed in IPC-2221B?
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