> Hi > Does anyone know the current carrying capacity per width of a track > on a pcb? > Thanks > Justin > ======== In article <32C8460B.6226@pacific.net.sg>, John D. Wilkinson wrote: > > To All, > Can someone provide a chart or some guideline breakdowns on determining > the correct PCB track widths for various DC current levels. Is there a > formula for calculating this??? Rough figures for 1oz copper, assuming a 30C temp rise, are as follows :- Width,mm. Amps. 0.75 1.5 1.00 2.0 1.50 2.5 2.00 3.0 2.50 4.0 All are near-approximations. 3.75 5.0 5.00 6.0 7.50 8.0 10.00 10.0 12.50 14.0 18.00 16.0 Guidance only, good practice would be to use much wider tracks in order to avoid any problems due to IR-drops. Bad practice is things like necking-down to go through somewhere and not bothering to re-widen as soon as possible. You would be well advised to also rate your tracks for survival during full fault-current. I do not have values for fusing current and just assume that 2x or 3x the above currents will get the track hot enough to start lifting. The simplest rule is to push your clearances in order to get tracks as fat as you can make them. -- [Tony Williams, Ledbury, Herefordshire, UK.---Pagewidth=64-----] ---------------------------- Marcelo Puhl mark@plug-in.com.br ------------------------------------------- Get paid to surf the WEB ! Ganhe dinheiro enquanto surfa na Internet ! http://alladvantage.com/go.asp?refid=DTJ608 -------------------------------------------