PCB Libraries Forum : Pad trimming for https://www.PCBLibraries.com/forum/ Thu, 16 Apr 2026 08:30:25 +0000 Thu, 16 Jul 2020 08:02:05 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2652 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Pad trimming for : The New V2020 Footprint Expert...]]> https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10819.html#10819 Author: Tom H
Subject: 2652
Posted: 16 Jul 2020 at 8:02am

The New V2020 Footprint Expert will default the Minimum Trim Standoff Height (A1) 0.03 mm. 

But the user can change it to whatever they want. 

The V2020 Beta can be downloaded at www.pcblibraries.com/downloads 
]]> Thu, 16 Jul 2020 08:02:05 +0000 https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10819.html#10819 <![CDATA[Pad trimming for : Thanks TomI had it set to 0.00,...]]> https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10818.html#10818 Author: ivanbajic
Subject: 2652
Posted: 15 Jul 2020 at 9:08pm

Thanks Tom

I had it set to 0.00, so I had about 0.215 mm from the body outline to be end of the pad. 

Setting the "Min Trim Standoff Height" to 0.05 mm does trim the pads to 0.05 mm. 

]]> Wed, 15 Jul 2020 21:08:46 +0000 https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10818.html#10818 <![CDATA[Pad trimming for : In Preferences &gt; Rules &gt;...]]> https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10817.html#10817 Author: Tom H
Subject: 2652
Posted: 15 Jul 2020 at 8:22pm

In Preferences > Rules > Minimum Trim Standoff, if you set the value to 0.05 the calculator will automatically trim the pad from under the low profile package when the A1 dimension is less than 0.05. 



]]> Wed, 15 Jul 2020 20:22:04 +0000 https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10817.html#10817 <![CDATA[Pad trimming for : Hi,We&#039;ve just stared using...]]> https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10816.html#10816 Author: ivanbajic
Subject: 2652
Posted: 15 Jul 2020 at 7:56pm

Hi,


We've just stared using PCB Libraries as a reference to generate our footprints. We are using JEDEC standards to reference component outlines.

Does anyone know why PCB Libraries does not trim the heel section for a pad when A1 (min)=0.00 mm, i.e.: the component body is sitting flush against the PCB? 

I'm concerned the Solder Paste on the Heel goal of the pad will slightly lift the component during Surface Mount reflow.

For example: I'm using JEDEC MO-193 AB to draw a SOT23-5 footprint. The heel part of the pad is not trimmed.

Thanks

]]> Wed, 15 Jul 2020 19:56:00 +0000 https://www.PCBLibraries.com/forum/pad-trimming-for_topic2652_post10816.html#10816