IPC-7352 incorrect table content?

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   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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eCADLER_94 Members Profile Send Private Message Find Members Posts Add to Buddy List New User Joined: 11 Feb 2026 Status: Offline Points: 4	Post Options Post Reply Quote eCADLER_94 Report Post Thanks(0) Quote Reply Topic: IPC-7352 incorrect table content? Posted: 7 hours 47 minutes ago 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



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 6064	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 4 hours 5 minutes ago at 7:30am
	I think you are correct. IPC got the Toe and Heel values backward.
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