PCB Libraries Forum : IPC-7352 incorrect table content? https://www.PCBLibraries.com/forum/ Tue, 19 May 2026 09:32:55 +0000 Tue, 19 May 2026 07:30:51 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 30 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3645 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[IPC-7352 incorrect table content? : I think you are correct.IPC got...]]> https://www.PCBLibraries.com/forum/ipc7352-incorrect-table-content_topic3645_post14538.html#14538 Author: Tom H
Subject: 3645
Posted: 19 May 2026 at 7:30am

I think you are correct. 

IPC got the Toe and Heel values backward. 

]]> Tue, 19 May 2026 07:30:51 +0000 https://www.PCBLibraries.com/forum/ipc7352-incorrect-table-content_topic3645_post14538.html#14538 <![CDATA[IPC-7352 incorrect table content? : Hello, I believe that table 3-6...]]> https://www.PCBLibraries.com/forum/ipc7352-incorrect-table-content_topic3645_post14537.html#14537 Author: eCADLER_94
Subject: 3645
Posted: 19 May 2026 at 3:48am

Hello,
I believe that table 3-6 "Leadless Components with Concave/Castellated Termination" cannot be correct. Let's take the Nominal column, here the Toe would be 0.15mm and the Heel 0.45mm.
In my opinion, it doesn't make much sense to pull the pad that far back. Also confusing is the note "to find Z dim" next to the Heel(JH). The formula for Z (overall length of land pattern) is:
Z = Lmax +2xJt
This therefore has nothing to do with the Heel.
In my opinion, the table values of Toe and Heel are swapped.
Do you see it that way too?"



Best regards
Johannes
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