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Question About Dimensions Being Rounded-off in IPC

Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Footprints / Land Patterns
Forum Description: [General or a CAD specific issues / discussions]
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3416
Printed Date: 21 Dec 2024 at 9:54am


Topic: Question About Dimensions Being Rounded-off in IPC
Posted By: elibu123
Subject: Question About Dimensions Being Rounded-off in IPC
Date 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!


Replies:
Posted By: Tom H
Date Posted: 28 Aug 2024 at 1:44pm
Everything is explained in the new V24.10 Footprint Expert "Help > User Guide". 



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