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DRC errors from Altium gang mask

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=3715
Printed Date: 14 Nov 2026 at 7:14am


Topic: DRC errors from Altium gang mask
Posted By: thomas.yunghans
Subject: DRC errors from Altium gang mask
Date Posted: 11 Nov 2026 at 9:17pm
Hello,

I created a footprint for a 0.4mm pitch SON device (SON11P40_200X250X80L35X20T140X120N) for Altium Designer.  Because the pitch between pads was so small, PCBExpert generated a gang mask over the pads.  Apparently the software uses multiple overlapping objects to create the gang mask.  It looks like the masks are overlapping properly, but for some reason Altium generates DRC failures.  I have a solder mask sliver rule limit of 3 mils in the Altium design rules.  

Am I doing something wrong?  Do you have a suggested workaround?

Tom Yunghans
3526 Glen Ave
Carlsbad, CA  92010
(714) 336-9503   uploads/16542/solder_mask_sliver_errors_from_gang_mask.jpg" rel="nofollow - uploads/16542/solder_mask_sliver_errors_from_gang_mask.jpg


Replies:
Posted By: Nick B
Date Posted: 12 Nov 2026 at 8:00am
In previous versions of Footprint Expert, the Gang Mask was drawn with multiple overlapping objects.

In the V26.10 release, Gand Mask is drawn with a single drafting outline.

Also, V27.01 pre-release is available to download and test.



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