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PCB Design Optimization Starts in the CAD Library

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budnoel View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote budnoel Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2013 at 5:05am
Hello,
 
What is your recommendation when the mfr. datasheet differs from the PCB Library Expert recommendations?  
 
I have an 4-pin Oscillator (concave corners) where the mfr is recommending 0.90 X 1.00 mm pads and the FP Expert is recommending 1.2 X 1.1 mm pads.  
 
Thanks in advance.
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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2013 at 7:03am
There is a "Footprint" tab in the Library Expert that allows the user to enter the mfr. recommended pad size and spacing.
 
If you open the SM.FPX file you will find that almost all the Oscillators have the mfr. recommended footprint values inserted into the "Footprint" tab in the IPC Calculator.
 
The big thing is the visual alignment of the component leads superimposed on the pad. I try both IPC and Mfr. and the one that physically looks best to me is the one I use.
 
For Side & Corner Concave Oscillators, I personally prefer to use the mfr. recommendation and when I do, that data is stored in the FPX file so when I change Drafting Outline or Ref Des sizes (in the User Preferences) the actual footprint pad placement always comes out the same when I use "Batch Create" to upgrade my entire library with new rules.
 
 
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wanghai View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wanghai Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jun 2013 at 11:01pm
LOL LOL Thanks!
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Nick B Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jun 2013 at 12:50pm
This presentation has been updated!!
Just make sure you are logged in to the forum and click this link (same as the link above):
PCB Design Optimization Presentation
 
What was changed: We added some 3D modeling updates - because the Library Expert now also outputs high quality 3D STEP - right with the footprints!! Yes, you don't need to manually create 3D models again!!! See some of the actual output files here.
 
You don't need to manually create footprints or search websites to find a matching 3D model or deal with the quality of a download from a website or the consistency of various 3D models downloaded from different websites. Library Expert puts you in control of your 3D model library to auto-generate 3D models fast and accurate when you need them.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nick B Quote  Post ReplyReply Direct Link To This Post Posted: 05 Sep 2013 at 9:53pm
This presentation has been updated!!
Just make sure you are logged in to the forum and click this link (same as the link above):
PCB Design Optimization Presentation
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Post Options Post Options   Thanks (0) Thanks(0)   Quote naik_pushkar Quote  Post ReplyReply Direct Link To This Post Posted: 14 Nov 2013 at 4:18am
Smile Thanks
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Artwork Master ITALY View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Artwork Master ITALY Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jan 2014 at 2:34am
maybe on pag. 25 of the document there is an error on the name of the via for BGA Pin Pitch 1.00 mm
it should be VIA55-25-70
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jan 2014 at 8:11am

This Via table is just the favorites. For the full spreadsheet download padstacks click here

The VIA55-25-70 is for a 0.15 mm trace / space (one trace between vias)

The VIA50-25-70 is for a 0.10 mm trace / space (two traces between vias)

 

 

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Artwork Master ITALY View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Artwork Master ITALY Quote  Post ReplyReply Direct Link To This Post Posted: 10 Jan 2014 at 11:22am
You are correct i was thinking that the VIA Name was based on the dimensions of the PAD but this is wrong.

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wanghai View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote wanghai Quote  Post ReplyReply Direct Link To This Post Posted: 31 Mar 2014 at 5:21am
LOL Thanks!
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