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BGA Environment on Footprint

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=1193
Printed Date: 07 Nov 2024 at 11:23pm


Topic: BGA Environment on Footprint
Posted By: jameshead
Subject: BGA Environment on Footprint
Date Posted: 25 Nov 2013 at 7:25am
I was under the impression that there is no environment added to the end of the BGA footprints, as indicated on the downloadable PDF from this site, however the Build Footprint in FPX adds a "L" environment at the end.


Replies:
Posted By: Tom H
Date Posted: 25 Nov 2013 at 7:30am

All Grid Array component families only have 1-tier for Pad Size calculations.

 

The other elements that change with 3-Tiers are –

·         Silkscreen Line Width

·         Reference Designator Height

·         Local Fiducial Size

·         Placement Courtyard Excess

 

 

However, if you want to change the Pad Size reduction percentage you have control of that in “Terminal > Settings > Size Adjustment” or you can permanently change it in User Preferences.

 

Grid arrays have a different preference structure. That’s because preference settings are dependent on the nominal ball  (or terminal size).  That is what determines the environment.

 

Sizes above 0.50 are considered ‘Most’; else sizes greater than 0.25 are ‘Nominal’ and anything smaller is ‘Least’.

 

Mask, Stencil and Courtyard settings are set directly in the preference table.

 

This environment will flow through to any other dependencies like assembly or silkscreen outline mapping.

 

  



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Posted By: jameshead
Date Posted: 25 Nov 2013 at 7:34am
Thanks for clarifying.


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