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Silkscreen Outside of the Courtyard

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=648
Printed Date: 22 Nov 2024 at 12:03pm


Topic: Silkscreen Outside of the Courtyard
Posted By: DaveCowl
Subject: Silkscreen Outside of the Courtyard
Date Posted: 30 Oct 2012 at 4:58pm
I notice that the RESC1005 footprint has silk screen outside of the courtyard.
 
Was this intentional?
 
I was under the impression that the courtyard should contain the whole part...?
 


Replies:
Posted By: Tom H
Date Posted: 30 Oct 2012 at 5:37pm
The center of the silkscreen line should be smaller than the center of the courtyard line.
 
What environment (Least, Nominal or Most) are you referring to?
 

Posted By: DaveCowl
Date Posted: 30 Oct 2012 at 6:09pm

I believe that it is nominal. This is RESC1005X40.

See below:

Posted By: Tom H
Date Posted: 30 Oct 2012 at 6:21pm
That's a bug in the software. The rule that the silkscreen is currently following is the "pad to silk" rule and the courtyard rule needs to over-ride the pad to silk rule.
 
I also forgot that when the chip body size is smaller than a 0603 the courtyard rules change to "Least Environment" but the silkscreen rules are still set to "Nominal Environment".
 
I'll notify the programmer.
 
Thanks
 

Posted By: DaveCowl
Date Posted: 06 Nov 2012 at 11:25am

So in the mean time should I:

1) Move the SS closer to the pad and inside the courtyard (perhaps reducing the length)

2) Increase the courtyard to include the SS as it currently stands

or

3) Go without SS for now.

?

Posted By: Tom H
Date Posted: 06 Nov 2012 at 1:56pm
Yes, yes & yes...
 
For very small microminiature parts we recommend -
  1. Removing the silkscreen by changing the line width to zero "0"
  2. If you need the silkscreen make the line width 1 mil smaller and the pad to silk 1 mil smaller
  3. Enlarge the Courtyard slightly

You can do all these things "on-the-fly". No need to change your User Preferences.

Posted By: Tom H
Date Posted: 18 Dec 2012 at 8:58am
I put in a request to add a new feature to make the courtyard centerline at least 0.01 mm bigger than the silkscreen centerline to compensate when the user changes the silkscreen to pad rule or the silkscreen line width.
 
This new rule will override the IPC-7351 default placement courtyard excess rule.
 


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