BGA Environment on Footprint

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   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.

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jameshead Members Profile Send Private Message Find Members Posts Add to Buddy List Expert User Joined: 20 Mar 2012 Location: Oxfordshire, UK Status: Offline Points: 576	Post Options Post Reply Quote jameshead Report Post Thanks(0) Quote Reply Topic: BGA Environment on Footprint 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.



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: 5716	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply 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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jameshead Members Profile Send Private Message Find Members Posts Add to Buddy List Expert User Joined: 20 Mar 2012 Location: Oxfordshire, UK Status: Offline Points: 576	Post Options Post Reply Quote jameshead Report Post Thanks(0) Quote Reply Posted: 25 Nov 2013 at 7:34am
	Thanks for clarifying.