I was looking at my LAN8720 module because I tried to build one myself. I realised that the traces on the PCB have mostly round edges/are really smooth while other PCB layouts I see have angular/edgy edges.

Should I make my traces also smooth or does it not matter?

  • 1
    \$\begingroup\$ What pcbs are you referring to? Firstly, what does the manufacturer of the LAN8720 suggest? Do they have a demo board or pcb layout? What layout guidance do they give? The debate between curved and sharp turns on pcb traces has long been debated. A quick Google should yield some resources. Last one I read was from Altium. The result - no difference. I'd suggest you do some research for your own edification. \$\endgroup\$
    – Kartman
    Commented May 14, 2021 at 10:26
  • \$\begingroup\$ I do read the datasheet but it basicly doesnt say anything at all about layout design. I found an eval board from the same company and they have "normal" lines. So I guess as Neil said it is aesthetics. \$\endgroup\$
    – Daniel Do
    Commented May 14, 2021 at 11:11

1 Answer 1


For most circuits, it's a matter of aesthetics.

For microwave circuits, it can make a very small difference to line impedance and losses. For very high voltage circuits, corona on sharp points might be an issue.


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