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DRC/ERC Width Errors Vs. Pad Width

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jkardach3R2M3
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DRC/ERC Width Errors Vs. Pad Width

Hi,

@jorge_garcia2 

I auto-routed a PCB and identified several nets in the RULES DRC/ERC classes to have various widths. In some solenoid circuits I wanted the trace width to be 32 mils, and added the appropriate signals into a Net Class, and assigned a rule for 32 mil trace widths.

 

The autorouting worked fine, but then I find that on several components using these nets I am getting Width DRC/ERC errors for certain smd pads:trace width set to 32 mil, pad is 45x27miltrace width set to 32 mil, pad is 45x27mil

After struggling a bit on this, I noted that the components smd pad width was 47milsx27mils; Could the error be caused by the width of the component's pad being less than 32 mils?  

I reduced the class rules for the Solenoid net from 32 mils to 27 mils and the error goes away. Is that supposed to work that way? I did not change the pad size, I did not change the trace size, I just reduced the requirement of the Class rule and no more error!   

Changed class rules to 27 milsChanged class rules to 27 mils

Seems like the DRC/ERC checker is checking SMC pads against width violations, which it really shouldn't be an error (at most a warning as you could have multiple pads to take the current). And the error goes away if you reduce the class rules to a lower number.

 

Seems like bug to me.

Jim Kardach

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Hello @jkardach3R2M3,

 

I hope you're doing well. I've passed this along to our developers for review. Thank you for bringing it up.

 

Let me know if there's anything else I can do for you.

 

Best Regards,



Jorge Garcia
​Product Support Specialist for Fusion 360 and EAGLE

Kudos are much appreciated if the information I have shared is helpful to you and/or others.

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