5 Replies Latest reply on Apr 30, 2015 8:40 PM by parth.sutariya

    Trace Resistance

    parth.sutariya

      Hi ,

       

      What should be the maximum trace resistance allowed ?

       

      Is there any standard value allowable for trace resistance ?

       

      --

      Best Regards ,
      Parth Sutariya
      Hardware CAD Engineer
      MATRIX COMSEC
      Vadodara , Gujarat
      INDIA

        • 1. Re: Trace Resistance
          yan_killy

          I do not understand the question. What are you trying to do?

           

          Yan

          • 2. Re: Trace Resistance
            jduquette

            Your maximum trace resistivity (ohm/unit length) is defined by the trace thickness and width.  Your PCB fabricator's design rules are going to define the minimum width for a given copper thickness.  Don't forget to include the plating thickness. 

             

            Google "pcb trace calculator" and you'll see lots of options to calculate the resistivity.  Your engineer needs to define any trace requirements that are out of the ordinary.  IPC-2152 is the standard for trace requirements as related to current flow and temperature rise.

            • 3. Re: Trace Resistance
              parth.sutariya

              Hi ,

               

              Thanks for the info .

               

              Is there any lower limit for trace resistance ? Any standard value ?

               

              Best Regards ,

              Parth Sutariya

              Hardware CAD Engineer

              MATRIX COMSEC

              Vadodara , Gujarat

              INDIA

              • 4. Re: Trace Resistance
                jduquette

                The theoretical limit is defined by the copper characteristics.  The practical limit is defined by how thick and wide you make the trace.  Typicall the standard value is 'don't care' because copper is a good conductor and the trace resistance is not significant. 

                 

                Why do you ask?

                • 5. Re: Trace Resistance
                  parth.sutariya

                  Hello ,

                   

                  Thanks for the info.

                   

                  I do consider the trace resistance calculation in power supply board but just wanted to know whether is there any limit for trace resistance or not .