Courtyard Does Not Honor Mfr Recommended Footprint

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   Using 2012.52 on Win7 x64. 
I went to create a new inductor from a CoilCraft datasheet.  I entered the dims and clicked OK.  

Then I decided that I needed to use the mfr recommended footprint.  Made the changes per the datasheet, hit OK and noticed that the courtyard moved to reflect the new pad locations but it was now INSIDE the silk/assembly outlines.

I think this new courtyard would certainly cause issues when placing on a tight circuit board.

Thanks,
Billy

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Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(1) Quote Reply Topic: Courtyard Does Not Honor Mfr Recommended Footprint Posted: 14 May 2013 at 9:13am
	Using 2012.52 on Win7 x64. I went to create a new inductor from a CoilCraft datasheet. I entered the dims and clicked OK. Then I decided that I needed to use the mfr recommended footprint. Made the changes per the datasheet, hit OK and noticed that the courtyard moved to reflect the new pad locations but it was now INSIDE the silk/assembly outlines. I think this new courtyard would certainly cause issues when placing on a tight circuit board. Thanks, Billy



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: 14 May 2013 at 11:54am
	Can you attach a web-link to the component package datahseet? I looks as though you're using the wrong component family. I cannot reproduce your error in the Molded Body component family.

Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(0) Quote Reply Posted: 14 May 2013 at 12:32pm
	No problem - http://www.coilcraft.com/pdf_viewer/showpdf.cfm?f=pdf_store:xal50xx.pdf I was using the dimensions from the dash number -331 part. So, starting with a new inductor and entering the dimensions shown on the first image should have produced a good courtyard. However, when entering the numbers shown on the Footprint\Dimensions tab with the Use Mfr dimensions checked, you should have been able to see the courtyard restrict while the silk / assembly info remain the same. Curious. Billy

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: 14 May 2013 at 12:35pm
	This Inductor is a 2-pin DFN (not a Molded Body)

Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(0) Quote Reply Posted: 14 May 2013 at 12:39pm
	Thanks ... so what key features do you look at to make that determination? I never even considered a DFN as an inductor body style, associating it with ICs and maybe smaller two pin devices like diodes.

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: 14 May 2013 at 1:01pm
	You just need to be familiar with your component families and Lead Types. I saw the component had terminals on the Bottom. That means it's a Flat No-Lead QFN, SON, DFN, etc. I'll be relocating this post to the Q&A forum.

Evenkeel Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 13 Dec 2012 Location: USA Status: Offline Points: 145	Post Options Post Reply Quote Evenkeel Report Post Thanks(0) Quote Reply Posted: 14 May 2013 at 1:01pm
	Thanks, Tom!