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Pad Size calculation

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=1196
Printed Date: 20 Nov 2025 at 11:09pm


Topic: Pad Size calculation
Posted By: gedeakins
Subject: Pad Size calculation
Date Posted: 27 Nov 2013 at 9:11am
I'm noticing that Footprint Expert does not take into account the lead thickness of certain devices (example D2PAK/TO-263AB) in the calculations?  Since IPC A-610 uses percentage of solder fillet -to- lead thickness in determining acceptance, wouldn't it be appropriate to incorporate this?


Replies:
Posted By: Tom H
Date Posted: 27 Nov 2013 at 10:46am

The PCB Library Expert uses rules from IPC-7351 not IPC-A-610.

Please present your issue with IPC and let us know what they say.
 
Thanks!
 


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