topic Re: DRC/ERC Width Errors Vs. Pad Width in Fusion Electronics Forum

DRC/ERC Width Errors Vs. Pad Width

jkardach3R2M3 — Sat, 16 Sep 2023 23:16:46 GMT

Hi,

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 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 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

Re: DRC/ERC Width Errors Vs. Pad Width

jorge_garcia — Mon, 18 Sep 2023 18:34:17 GMT

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,

Re: DRC/ERC Width Errors Vs. Pad Width

panpan_fan — Wed, 18 Sep 2024 09:10:35 GMT

Hi @jkardach3R2M3

Today we release Fusion V2.0.20256 and now we have the new DRC engine now.

You can set your own Custom Rules for the SMD separately.

For example, we can set different copper width for different scopes.

Please upgrade Fusion and have a try, thanks a lot!

Regards,

Panpan Fan