PCB Libraries Forum : Courtyard Excess Value For Non Standard Packages https://www.PCBLibraries.com/forum/ Wed, 15 Apr 2026 03:27:22 +0000 Thu, 11 Jul 2019 08:42:41 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2509 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Courtyard Excess Value For Non Standard Packages : Over the past 5 years, we have...]]> https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10349.html#10349 Author: Tom H
Subject: 2509
Posted: 11 Jul 2019 at 8:42am

Over the past 5 years, we have been using these Courtyard Excess values for "Standard Packages" that were tested by customers and reported great results. This has nothing to do with IPC. 
  1. Most = 0.40
  2. Nominal = 0.20
  3. Least = 0.10
The original IPC-7351B Courtyard Values were created in 2004 and are now 15 years old. 

New technology for Assembly machines has improved placement accuracy down to +/- 0.01 mm. 

There is no need for a 0.25 courtyard as it consumes too much PCB real-estate for densely populated layouts. 

Also, IPC-7351 has been downgraded from a "Standard" to a "Guideline" and is not to be taken literally. 

You must use your own common sense and advice from your assembly team to create your design rules. 


]]> Thu, 11 Jul 2019 08:42:41 +0000 https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10349.html#10349 <![CDATA[Courtyard Excess Value For Non Standard Packages : Tom,Is this for revision B or...]]> https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10348.html#10348 Author: 5not4
Subject: 2509
Posted: 11 Jul 2019 at 8:33am

Tom,
 
Is this for revision B or C? It seems to me most nominal courtyards in the B version are .25mm.
]]> Thu, 11 Jul 2019 08:33:44 +0000 https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10348.html#10348 <![CDATA[Courtyard Excess Value For Non Standard Packages : Thank you Tom. ]]> https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10339.html#10339 Author: Batiskaff
Subject: 2509
Posted: 03 Jul 2019 at 9:08am

Thank you Tom.]]> Wed, 03 Jul 2019 09:08:13 +0000 https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10339.html#10339 <![CDATA[Courtyard Excess Value For Non Standard Packages : Nominal Density Standard Components...]]> https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10335.html#10335 Author: Tom H
Subject: 2509
Posted: 03 Jul 2019 at 7:18am

Nominal Density Standard Components use a 0.20 mm courtyard excess. 

Unique Non-Standard packages us a 0.25 mm courtyard excess, but if any dimension L, W & H are over 10.00 mm then we make the courtyard 0.50 mm to make room for rework equipment. This is mostly connectors. 

]]> Wed, 03 Jul 2019 07:18:30 +0000 https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10335.html#10335 <![CDATA[Courtyard Excess Value For Non Standard Packages : What are the general recommendation...]]> https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10333.html#10333 Author: Batiskaff
Subject: 2509
Posted: 03 Jul 2019 at 3:24am

What are the general recommendation for values of Courtyard to Body and Courtyard to Pad Excesses for non-standard packages?
For example:
https://media.digikey.com/pdf/Data%20Sheets/Cooper%20Bussmann%20PDFs/EM7117xx_Series.pdf
https://www.cui.com/product/resource/pj-002a.pdf
]]> Wed, 03 Jul 2019 03:24:11 +0000 https://www.PCBLibraries.com/forum/courtyard-excess-value-for-non-standard-packages_topic2509_post10333.html#10333