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Courtyard Roundoff

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=2380
Printed Date: 25 Nov 2024 at 2:38am


Topic: Courtyard Roundoff
Posted By: Batiskaff
Subject: Courtyard Roundoff
Date Posted: 03 Sep 2018 at 2:03am
In BGA: The Courtyard Place Round-off default setting is 0,10 mm

In QFP: The Courtyard Place Round-off default setting is 0,01 mm

Are these settings similar or no? 

If no, why will rounded Courtyard Size in BGA, and Courtyard Place in QFP?

Thanks for any reply.


Replies:
Posted By: Tom H
Date Posted: 03 Sep 2018 at 8:25am
The Courtyard Excess setting for BGA's are much more robust than other component packages. 

The BGA Courtyard Excess is determined by the Ball Diameter. 

However, the end user has 100% control of all the values in Preferences. i.e.: the user can change any default value in the program to fit your requirements. 

All the default values in Preferences are simply a recommendation and not a "Standard". 

Change the values to whatever you want for your personal custom library creation. 



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Posted By: Volkmar
Date Posted: 28 Jan 2019 at 2:54am
Hi Tom,

thanks for pointing that out.
It would be nice though, to be able to save a value for the Courtyard Excess in the Preferences file for BGA, CGA and LGA components.
A larger Courtyard Excess for Grid Array components is desirable for optical inspection e.g. with an endoscope like the Ersascope.

      Volkmar


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...yet there's method in't.

Posted By: Tom H
Date Posted: 28 Jan 2019 at 8:01am
In Preferences, there is a different courtyard setting for each terminal lead diameter and the user can create as many Terminal Lead Diameters as they want. 

Go to "Preferences > Terminals > SM Grid Array's > BGA, LGA or CGA" and there are tables for the various Lead Diameter's and each one has a separate Courtyard Excess. 



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