|Thread Links||Date Links|
|Thread Prev||Thread Next||Thread Index||Date Prev||Date Next||Date Index|
I have been running a little informal test of current carrying capacity. I am currently (get it) running 2.6 Amperes through a pair of traces (.010 X .0014) wired in series, embedded in the inner layers, one directly above the other, of the test board shown. The temperature rise is approximately 60 degrees C over ambient yielding 98 to 107 C as measured on the surface of the pcb. No discoloration of the board material has been noted. The traces are dissipating 1.138 X 2.60 = 2.96 W. No catastrophic failure has been noted. Now. I predict that if traces are failing at .250 A, those must be small traces indeed! Sterling Vaden Dave Dwelley wrote: > Do these miniature traces affect our 20 ohm wiring budget? > > What's the typical DC resistance of a patch panel? > > Dave Dwelley > > Jack Andresen wrote: > > >But let me go back to original issue. I have looked at many patch panel > >PC boards and for various reasons, the traces run from 10 to 18 mils. > >Possible reasons: > >1) Making pairs of traces 100 ohm. 2) Trying to get between the RJ45 > >pins. 3) Running a pair between the 110 punch down pins. 4) In general, > >there is very little space for both compensation and wiring while > >leaving margins between pairs of traces. 5) People are afraid of too > >fine traces > >But it is important to recognize here is no general standard for patch > >panel traces (as pointed out in one of the responses).