|
|
Courtyard Excess Value For Non Standard Packages |
Post Reply 
|
| Author | |
Batiskaff 
Advanced User 
Joined: 30 Apr 2018 Status: Offline Points: 65 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: Courtyard Excess Value For Non Standard PackagesPosted: 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 |
|
 |
|
|
|
|
Tom H
Admin Group 
Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716 |
Post Options
Thanks(0)
Quote Reply
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. |
|
|
|
|
Batiskaff
Advanced User
Joined: 30 Apr 2018 Status: Offline Points: 65 |
Post Options
Thanks(0)
Quote Reply
Posted: 03 Jul 2019 at 9:08am |
|
Thank you Tom.
|
|
|
|
|
5not4
Active User 
Joined: 09 Jul 2013 Status: Offline Points: 40 |
Post Options
Thanks(0)
Quote Reply
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.
|
|
|
|
|
Tom H
Admin Group
Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5716 |
Post Options
Thanks(0)
Quote Reply
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.
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. |
|
|
|
|
Post Reply
|
|
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options