Fusion Electronics
Working an electronics project and need help with the schematic, the PCB, or making your components? Join the discussion as our community of electronic design specialists and industry experts provide you their insight and best practices.
Showing results for 
Show  only  | Search instead for 
Did you mean: 

DRC/ERC Width Errors Vs. Pad Width

Message 1 of 2
63 Views, 1 Reply

DRC/ERC Width Errors Vs. Pad Width



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

Message 2 of 2

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.

Did this resolve your issue? Please accept it "As a Solution" so others may benefit from it.

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report