Square vs Round pad












6












$begingroup$


I'm curious why PCBs have one square pad in row for 0.1" headers.
What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?



Example






header pads







share|improve this question









$endgroup$

















    6












    $begingroup$


    I'm curious why PCBs have one square pad in row for 0.1" headers.
    What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?



    Example






    header pads







    share|improve this question









    $endgroup$















      6












      6








      6





      $begingroup$


      I'm curious why PCBs have one square pad in row for 0.1" headers.
      What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?



      Example






      header pads







      share|improve this question









      $endgroup$




      I'm curious why PCBs have one square pad in row for 0.1" headers.
      What is purpose of putting one square pad? What it indicates? Can you push more amps through square pad than round?



      Example






      header pads




      header pads






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 7 hours ago









      SilvioCroSilvioCro

      8019




      8019






















          4 Answers
          4






          active

          oldest

          votes


















          11












          $begingroup$

          This is to identify which pin is "pin 1".



          In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.



          If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).




          Can you push more amps through square pad than round?




          No, it won't cause any significant difference on the circuit performance.



          (As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)






          share|improve this answer











          $endgroup$













          • $begingroup$
            Comments are not for extended discussion; this conversation has been moved to chat.
            $endgroup$
            – Dave Tweed♦
            2 hours ago



















          5












          $begingroup$

          Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.






          share|improve this answer









          $endgroup$













          • $begingroup$
            But in case with Arduino Nano(for example), it doesn't help.
            $endgroup$
            – SilvioCro
            7 hours ago






          • 1




            $begingroup$
            @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
            $endgroup$
            – awjlogan
            7 hours ago










          • $begingroup$
            @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
            $endgroup$
            – Electric_90
            7 hours ago



















          3












          $begingroup$

          It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.



          No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.



          The square pad doesn't make a electronic difference when compared to round pads.






          share|improve this answer











          $endgroup$





















            1












            $begingroup$

            It indicates the location of pin 1






            share|improve this answer









            $endgroup$













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              4 Answers
              4






              active

              oldest

              votes








              4 Answers
              4






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              11












              $begingroup$

              This is to identify which pin is "pin 1".



              In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.



              If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).




              Can you push more amps through square pad than round?




              No, it won't cause any significant difference on the circuit performance.



              (As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)






              share|improve this answer











              $endgroup$













              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed♦
                2 hours ago
















              11












              $begingroup$

              This is to identify which pin is "pin 1".



              In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.



              If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).




              Can you push more amps through square pad than round?




              No, it won't cause any significant difference on the circuit performance.



              (As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)






              share|improve this answer











              $endgroup$













              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed♦
                2 hours ago














              11












              11








              11





              $begingroup$

              This is to identify which pin is "pin 1".



              In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.



              If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).




              Can you push more amps through square pad than round?




              No, it won't cause any significant difference on the circuit performance.



              (As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)






              share|improve this answer











              $endgroup$



              This is to identify which pin is "pin 1".



              In the case of a single-row header with no orientation key, this might not really matter, but the layout tool might do this by default and the designer didn't think to turn it off.



              If this were to be used with a connector that does have an orientation key, I'd much rather also have a pin 1 indicator in silkscreen, so that the orientation can be checked after the connector is loaded (and without having to flip the board over).




              Can you push more amps through square pad than round?




              No, it won't cause any significant difference on the circuit performance.



              (As pointed out in comments, for an RF or high-voltage application you might need to consider more carefully before using this method of orientation marking)







              share|improve this answer














              share|improve this answer



              share|improve this answer








              edited 7 hours ago

























              answered 7 hours ago









              The PhotonThe Photon

              84.9k397197




              84.9k397197












              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed♦
                2 hours ago


















              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed♦
                2 hours ago
















              $begingroup$
              Comments are not for extended discussion; this conversation has been moved to chat.
              $endgroup$
              – Dave Tweed♦
              2 hours ago




              $begingroup$
              Comments are not for extended discussion; this conversation has been moved to chat.
              $endgroup$
              – Dave Tweed♦
              2 hours ago













              5












              $begingroup$

              Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.






              share|improve this answer









              $endgroup$













              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                7 hours ago






              • 1




                $begingroup$
                @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
                $endgroup$
                – awjlogan
                7 hours ago










              • $begingroup$
                @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
                $endgroup$
                – Electric_90
                7 hours ago
















              5












              $begingroup$

              Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.






              share|improve this answer









              $endgroup$













              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                7 hours ago






              • 1




                $begingroup$
                @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
                $endgroup$
                – awjlogan
                7 hours ago










              • $begingroup$
                @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
                $endgroup$
                – Electric_90
                7 hours ago














              5












              5








              5





              $begingroup$

              Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.






              share|improve this answer









              $endgroup$



              Not a standard, but it's useful to mark where pin 1 is. This might be useful if you don't have a silkscreen, but you wish to mark the orientation of the socket.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered 7 hours ago









              awjloganawjlogan

              3,64211328




              3,64211328












              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                7 hours ago






              • 1




                $begingroup$
                @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
                $endgroup$
                – awjlogan
                7 hours ago










              • $begingroup$
                @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
                $endgroup$
                – Electric_90
                7 hours ago


















              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                7 hours ago






              • 1




                $begingroup$
                @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
                $endgroup$
                – awjlogan
                7 hours ago










              • $begingroup$
                @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
                $endgroup$
                – Electric_90
                7 hours ago
















              $begingroup$
              But in case with Arduino Nano(for example), it doesn't help.
              $endgroup$
              – SilvioCro
              7 hours ago




              $begingroup$
              But in case with Arduino Nano(for example), it doesn't help.
              $endgroup$
              – SilvioCro
              7 hours ago




              1




              1




              $begingroup$
              @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
              $endgroup$
              – awjlogan
              7 hours ago




              $begingroup$
              @SilvioCro Why not? Looking at a picture of the Nano (and some knockoffs), the TX1 pin is usually square, so you could work out the orientation based on that.
              $endgroup$
              – awjlogan
              7 hours ago












              $begingroup$
              @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
              $endgroup$
              – Electric_90
              7 hours ago




              $begingroup$
              @SilvioCro, It is a common practice, most PCB software / manufacturer prefer this and since it doesn't change much electronically (except RF), it is fine to just add it
              $endgroup$
              – Electric_90
              7 hours ago











              3












              $begingroup$

              It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.



              No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.



              The square pad doesn't make a electronic difference when compared to round pads.






              share|improve this answer











              $endgroup$


















                3












                $begingroup$

                It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.



                No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.



                The square pad doesn't make a electronic difference when compared to round pads.






                share|improve this answer











                $endgroup$
















                  3












                  3








                  3





                  $begingroup$

                  It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.



                  No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.



                  The square pad doesn't make a electronic difference when compared to round pads.






                  share|improve this answer











                  $endgroup$



                  It is there to mark the location of a specific pin (mostly pin 1). It helps in deciding the orientation in which a component should be placed.



                  No you can't push more amps through the square pad. Check to see if the trace running to that pad is wider than the other traces, if not than it is similar to the others.



                  The square pad doesn't make a electronic difference when compared to round pads.







                  share|improve this answer














                  share|improve this answer



                  share|improve this answer








                  edited 7 hours ago

























                  answered 7 hours ago









                  Electric_90Electric_90

                  724117




                  724117























                      1












                      $begingroup$

                      It indicates the location of pin 1






                      share|improve this answer









                      $endgroup$


















                        1












                        $begingroup$

                        It indicates the location of pin 1






                        share|improve this answer









                        $endgroup$
















                          1












                          1








                          1





                          $begingroup$

                          It indicates the location of pin 1






                          share|improve this answer









                          $endgroup$



                          It indicates the location of pin 1







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 7 hours ago









                          uglyoldbobuglyoldbob

                          1195




                          1195






























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