PCB Libraries Forum : Round off in footprint expert calculator https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 14:42:27 +0000 Wed, 28 Aug 2024 13:46:55 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3415 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Round off in footprint expert calculator : After calculation of a footprint,...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13633.html#13633 Author: Tom H
Subject: 3415
Posted: 28 Aug 2024 at 1:46pm

After calculation of a footprint, select the Footprint panel > Calculation Details. 

]]> Wed, 28 Aug 2024 13:46:55 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13633.html#13633 <![CDATA[Round off in footprint expert calculator : Altium uses the original 2005...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13631.html#13631 Author: Tom H
Subject: 3415
Posted: 28 Aug 2024 at 1:41pm

Altium uses the original 2005 IPC-7351 release. 

V24.11 Footprint Expert uses a combination of these standards and guidelines:
  • IPC-7351B (Mathematical model)
  • IPC-7352 (Pad Stack naming convention)
  • IPC J-STD-001 (Solder Joint Goals)
  • IEC 61188-7 (Zero component orientation) 
  • IPC-7093A (Solder mask defined thermal pads)

]]> Wed, 28 Aug 2024 13:41:51 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13631.html#13631 <![CDATA[Round off in footprint expert calculator : I am comparing the formula difference...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13629.html#13629 Author: eaglor
Subject: 3415
Posted: 28 Aug 2024 at 10:44am

I am comparing the formula difference between Altium Designer and Footprint Export, just want to know which one is better? which value should be round to compliant with the B standard. ]]> Wed, 28 Aug 2024 10:44:07 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13629.html#13629 <![CDATA[Round off in footprint expert calculator : Hi Tom,Thanks, Does the &#034;V24.10&#034;...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13628.html#13628 Author: eaglor
Subject: 3415
Posted: 28 Aug 2024 at 10:41am

Hi Tom,

Thanks, Does the "V24.10" round the ZMax and GMin value, not the C and X value?
]]> Wed, 28 Aug 2024 10:41:25 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13628.html#13628 <![CDATA[Round off in footprint expert calculator : You should download and install...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13627.html#13627 Author: Tom H
Subject: 3415
Posted: 28 Aug 2024 at 10:39am

You should download and install the V24.10 Footprint Expert Calculator to get better results. 

www.pcblibraries.com/downloads

]]> Wed, 28 Aug 2024 10:39:11 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13627.html#13627 <![CDATA[Round off in footprint expert calculator : Hi AllI am using the Footprint...]]> https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13626.html#13626 Author: eaglor
Subject: 3415
Posted: 28 Aug 2024 at 10:20am

Hi All

I am using the Footprint Expert SMD Reference Calculator.xlsx. 

I have a question about the round off when calculating the footprint pad size and spacing. 

Why does it round the C(Center to Center Spacing) and X value, not the ZMax and GMin value? 

Is it compliant with IPC7351B standard?

Thanks

]]> Wed, 28 Aug 2024 10:20:08 +0000 https://www.PCBLibraries.com/forum/round-off-in-footprint-expert-calculator_topic3415_post13626.html#13626