PCB Libraries Forum : Question About Dimensions Being Rounded-off in IPC https://www.PCBLibraries.com/forum/ Wed, 15 Apr 2026 21:53:38 +0000 Wed, 28 Aug 2024 13:44:51 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3416 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Question About Dimensions Being Rounded-off in IPC : Everything is explained in the...]]> https://www.PCBLibraries.com/forum/question-about-dimensions-being-roundedoff-in-ipc_topic3416_post13632.html#13632 Author: Tom H
Subject: 3416
Posted: 28 Aug 2024 at 1:44pm

Everything is explained in the new V24.10 Footprint Expert "Help > User Guide". 

]]> Wed, 28 Aug 2024 13:44:51 +0000 https://www.PCBLibraries.com/forum/question-about-dimensions-being-roundedoff-in-ipc_topic3416_post13632.html#13632 <![CDATA[Question About Dimensions Being Rounded-off in IPC : Hello Everyone,I have a question...]]> https://www.PCBLibraries.com/forum/question-about-dimensions-being-roundedoff-in-ipc_topic3416_post13630.html#13630 Author: elibu123
Subject: 3416
Posted: 28 Aug 2024 at 12:40pm

Hello Everyone,

I have a question regarding the rounding of dimensions based on the IPC-7351B standard for land pattern calculations.

Shouldn't the dimensions being rounded off be the final land pattern dimensions—overall length of the land pattern (Z), distance between lands in the pattern (G), and width of the land pattern (X)? Why is Library Expert rounding off the pad-to-pad spacing (C) and pad length (Y) instead?

Thank you!

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