How many ampere thru PCB track ?

Hi...

How many ampere can safely go through a PCB track of 1 millimeter width and

Thank you..

How long is the trace? That sounds like 1 oz cu which is 0.50m ohms/square, so 10mm long would be 5.0m ohms. If the ends points are cooled by vias, pads or such then the current capability can be quite high, like >5.0A. If the length gets greater than 4.0 cm, treat it as a long lead and go to the chart that everyone else will point out to you. Don't let the smoke out. Cheers, Harry

Shoot for 600 circular mills per amp. I leave the area calculations for the student.

Graham

Using my trusty copy of PCBTEMP from UltraCAD, 1 oz cu, 0.040 inch, external, 10C rise is 1.6A, 21mVolt per inch. Internal track: 10C rise is 1A, 12.9mVolt per inch

Both cases, effective resistance is 12.88milliohm per inch

Much depends on how long the track is if you want to distribute power.

Cheers

PeteS

Thanks All.