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Courtyard Calculation

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Bharat_Verma View Drop Down
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    Posted: 01 Jun 2023 at 3:32am
Hi Tom,

What is the formula for the courtyard? 

I mean what is the clearance value from pad / outline.

Where can I find it? Is it included in "CAD_Settings" or "IPC-7352" option .opt files?

Is there any standard values defined to draw a courtyard in IPC?

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Tom H View Drop Down
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 01 Jun 2023 at 8:30am
The default Courtyard settings for 3 Density Levels in Footprint Expert are: 
  • Most - 0.40
  • Nominal - 0.20
  • Least - 0.10 
These settings are proven technology that has worked perfectly for the past 10 years. 

These are slightly different than IPC-7351:
  • Most - 0.50
  • Nominal - 0.25
  • Least - 0.10 
You can change the Courtyard values in "Tools > Options > Terminals > Surface Mount & Through-hole".

Courtyards in PCB design tools are used for assembly Part Placement, Rework, Via site locations. 

Enterprise CAD tools like Allegro and Xpedition have internal part placement rules and the Courtyard values are set to 0.00. They use the courtyard for other things like Placement Boundary to establish the part placement rules in the native CAD tool. 

If you open the IPC-7352 Option file, be sure to save it under a different name because the Footprint Expert installer will overwrite the master file every time.

The CAD_Settings Option file is used to save all your CAD tool interface Options for Layer Assignments, Output Directory, CAD tool version, 3D STEP options, etc. when you select the wrench icon to create a footprint. 

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