PCB Libraries Forum : Trim Pad Under Component Feature https://www.PCBLibraries.com/forum/ Mon, 13 Apr 2026 13:23:05 +0000 Sat, 29 Dec 2012 12:13:14 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=574 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Trim Pad Under Component Feature : Dipak, Download the Power...]]> https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post2749.html#2749 Author: Tom H
Subject: 574
Posted: 29 Dec 2012 at 12:13pm

Dipak,
 
Download the Power Point presentation that describes the upcoming changes for IPC-7351C.
 
It's called "PCB Optimization Starts in the CAD Library" -
http://www.pcblibraries.com/forum/pcb-library-construction-guidelines_forum30.html
 
Slide 16 explains that pad trimming is not an IPC standard and that the pad should extend under the component body.
 
However, you can still "Trim Pads" in the Footprint Expert if you want to. i.e.: The "Trim Pad" feature is still there, the component stand-off default value is set to zero "0".
 
If you want to turn on the "Trim Pad" featurre go to "Setup > User Preferences > Setup > Rules > Minimum Trim Stand-off Height > Value". Set the "Value" to whatever component body stand-off you need to start trimming pads from under the component.
 
 
]]> Sat, 29 Dec 2012 12:13:14 +0000 https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post2749.html#2749 <![CDATA[Trim Pad Under Component Feature : It is the Y (L in New) dimension Thanks Dipak...]]> https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1844.html#1844 Author: dipakdesai
Subject: 574
Posted: 21 Sep 2012 at 8:41am

It is the Y (L in New) dimension
 
Thanks
Dipak
]]> Fri, 21 Sep 2012 08:41:24 +0000 https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1844.html#1844 <![CDATA[Trim Pad Under Component Feature : I think perhaps dipakdesai...]]> https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1842.html#1842 Author: jameshead
Subject: 574
Posted: 21 Sep 2012 at 12:26am

I think perhaps dipakdesai has spotted the Y dimension difference because FPX uses IPC-7351C with no pad triming on the pad.]]> Fri, 21 Sep 2012 00:26:03 +0000 https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1842.html#1842 <![CDATA[Trim Pad Under Component Feature : Is it the Component Rotation...]]> https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1841.html#1841 Author: Tom H
Subject: 574
Posted: 20 Sep 2012 at 8:24pm

Is it the Component Rotation or the JEDEC Dimensions or the program Header? 
 
]]> Thu, 20 Sep 2012 20:24:10 +0000 https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1841.html#1841 <![CDATA[Trim Pad Under Component Feature : HiI see a big difference...]]> https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1840.html#1840 Author: dipakdesai
Subject: 574
Posted: 20 Sep 2012 at 7:27pm

Hi
I see a big difference between PCB Footprint Expert 2012.21 and LP Calculator see below I understand there is a small difference but this is big. Does anyone else see this.
]]> Thu, 20 Sep 2012 19:27:13 +0000 https://www.PCBLibraries.com/forum/trim-pad-under-component-feature_topic574_post1840.html#1840