PCB Libraries Forum : Wrong Pad Stack Name? https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 12:28:44 +0000 Fri, 01 Dec 2017 21:13:52 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2258 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Wrong Pad Stack Name? : Pad stack name sizes (and certain...]]> https://www.PCBLibraries.com/forum/wrong-pad-stack-name_topic2258_post9331.html#9331 Author: Jeff.M
Subject: 2258
Posted: 01 Dec 2017 at 9:13pm

Pad stack name sizes (and certain footprint sizes) are created in what we call 'centrons'.
Without going into a whole lot of detail, a conversion factor is added to a dimension and decimal places are dropped.
The hole size in this case is actually 0.409.
After conversion and dropping the decimal place it equals 40 not 41 as you would expect if it were simply rounded thus h40.
]]> Fri, 01 Dec 2017 21:13:52 +0000 https://www.PCBLibraries.com/forum/wrong-pad-stack-name_topic2258_post9331.html#9331 <![CDATA[Wrong Pad Stack Name? : When I use inch dimensions in...]]> https://www.PCBLibraries.com/forum/wrong-pad-stack-name_topic2258_post9330.html#9330 Author: dlveazie
Subject: 2258
Posted: 01 Dec 2017 at 8:34am

When I use inch dimensions in pad stack calculator, the pad stack name looks like it's getting truncated instead of rounded. 

Creating pad stack for 0.025" x 0.025" lead says hole size should be 0.041" with 0.061" pad but pad stack name is c61h40.



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