Silkscreen Outside of the Courtyard

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

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...?

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
DaveCowl Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Oct 2012 Location: Santa Clara, CA Status: Offline Points: 161	Post Options Post Reply Quote DaveCowl Report Post Thanks(1) Quote Reply Topic: Silkscreen Outside of the Courtyard 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...?



Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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?

DaveCowl Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Oct 2012 Location: Santa Clara, CA Status: Offline Points: 161	Post Options Post Reply Quote DaveCowl Report Post Thanks(1) Quote Reply Posted: 30 Oct 2012 at 6:09pm
	I believe that it is nominal. This is RESC1005X40. See below:

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(1) Quote Reply 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

DaveCowl Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 18 Oct 2012 Location: Santa Clara, CA Status: Offline Points: 161	Post Options Post Reply Quote DaveCowl Report Post Thanks(0) Quote Reply 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. ?

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 06 Nov 2012 at 1:56pm
	Yes, yes & yes... For very small microminiature parts we recommend - Removing the silkscreen by changing the line width to zero "0" If you need the silkscreen make the line width 1 mil smaller and the pad to silk 1 mil smaller Enlarge the Courtyard slightly You can do all these things "on-the-fly". No need to change your User Preferences.

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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.