No Silkscreen Created For QFN

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

I have a QFN package I created with Library Expert, but the silkscreen did not get defined.   
As expected?  If so, how to handle pin 1 marking?

Link to part in question: http://www.enpirion.com/products-dcdc-converter-step-down-buck-ep53f8qi.htm 

Chad

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
chads108 Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 17 Oct 2012 Location: Plano, TX Status: Offline Points: 35	Post Options Post Reply Quote chads108 Report Post Thanks(0) Quote Reply Topic: No Silkscreen Created For QFN Posted: 28 Nov 2012 at 8:36am
	I have a QFN package I created with Library Expert, but the silkscreen did not get defined. As expected? If so, how to handle pin 1 marking? Link to part in question: http://www.enpirion.com/products-dcdc-converter-step-down-buck-ep53f8qi.htm Chad



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: 5717	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 28 Nov 2012 at 8:46am
	The component leads are very close to the package corners where the silkscreen is normally placed outside the component package and inside the placement courtyard. You need to manually add a line or dot polarity mark in your CAD tool editor. This is a workaround until we add interactive editing in the PCB Footprint Editor.

chads108 Members Profile Send Private Message Find Members Posts Add to Buddy List Active User Joined: 17 Oct 2012 Location: Plano, TX Status: Offline Points: 35	Post Options Post Reply Quote chads108 Report Post Thanks(0) Quote Reply Posted: 28 Nov 2012 at 8:49am
	So you would recommend leaving all silkscreen off of this part other than the polarity mark?

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: 5717	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 28 Nov 2012 at 9:08am
	Using the CAD tool editor I would make my part look like this - The current PCB Footprint Editor is a basic "Template" tool for "Standard Component Packages". This QFN is just outside the "Standard" category. So until the FPE program introduces interactive editing you'll have to spend a couple minutes adding some custom silkscreen lines using your CAD tool library editor.