The criteria for trace width are current vs. temperature rise. For information about PCB trace widths vs. copper thickness, current and temperature rise, there are a number of online calculators available, based on the graphs that @cjohnson kindly uploaded in his reply to this post: [https://easyeda.com/forum/topic/PCB-high-current-thermal-design-562f7a69a7ad41a38b18ea150d6703ed](https://easyeda.com/forum/topic/PCB-high-current-thermal-design-562f7a69a7ad41a38b18ea150d6703ed). For example: [https://www.7pcb.com/trace-width-calculator.php](https://www.7pcb.com/trace-width-calculator.php)<br> <br> [https://www.4pcb.com/trace-width-calculator.html](https://www.4pcb.com/trace-width-calculator.html)<br> <br> [https://www.desmith.net/NMdS/Electronics/TraceWidth.html](https://www.desmith.net/NMdS/Electronics/TraceWidth.html)<br> <br> [https://www.smps.us/pcb-calculator.html](https://www.smps.us/pcb-calculator.html)

thanks for the quick help!

Andy, I used the calculator and came up with 0.5" traces. To me, that does not seem right (exceptionally large). Especially when the chip ([https://www.ti.com/lit/ds/symlink/tps22810-q1.pdf?#page=4](https://www.ti.com/lit/ds/symlink/tps22810-q1.pdf?#page=4)) utilizes 6mm (0.237") wide pads. I don't think the 0.22mm chip leads make up the difference.   inputs: 15a, 4" leads, 1oz copper Thoughts?

Hi! You use 0.5" trace all the way until you get to the IC pad and then you shrink the width of the trace to match the pad width. I usually increment widths in 0.12" increments: 0.12", 0.24", 0.36" and 0.48" so on.... Here is an example:  First you make a normal trace between the pads of the components and then you fill it with "copper area" or "solid region" command to make the trace wider. Regards, Markus Virtanen HW / Electronics Designer