Square vs Round pad












8












$begingroup$


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










share|improve this question









$endgroup$

















    8












    $begingroup$


    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










    share|improve this question









    $endgroup$















      8












      8








      8


      0



      $begingroup$


      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










      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






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Feb 8 at 17:05









      SilvioCroSilvioCro

      120110




      120110






















          4 Answers
          4






          active

          oldest

          votes


















          19












          $begingroup$

          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
            Feb 8 at 22:07



















          7












          $begingroup$

          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
            Feb 8 at 17:09






          • 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
            Feb 8 at 17:14










          • $begingroup$
            @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
            Feb 8 at 17:33



















          5












          $begingroup$

          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











          $endgroup$





















            2












            $begingroup$

            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









              19












              $begingroup$

              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
                Feb 8 at 22:07
















              19












              $begingroup$

              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
                Feb 8 at 22:07














              19












              19








              19





              $begingroup$

              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 Feb 8 at 17:18

























              answered Feb 8 at 17:09









              The PhotonThe Photon

              87k398202




              87k398202












              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed
                Feb 8 at 22:07


















              • $begingroup$
                Comments are not for extended discussion; this conversation has been moved to chat.
                $endgroup$
                – Dave Tweed
                Feb 8 at 22:07
















              $begingroup$
              Comments are not for extended discussion; this conversation has been moved to chat.
              $endgroup$
              – Dave Tweed
              Feb 8 at 22:07




              $begingroup$
              Comments are not for extended discussion; this conversation has been moved to chat.
              $endgroup$
              – Dave Tweed
              Feb 8 at 22:07













              7












              $begingroup$

              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
                Feb 8 at 17:09






              • 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
                Feb 8 at 17:14










              • $begingroup$
                @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
                Feb 8 at 17:33
















              7












              $begingroup$

              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
                Feb 8 at 17:09






              • 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
                Feb 8 at 17:14










              • $begingroup$
                @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
                Feb 8 at 17:33














              7












              7








              7





              $begingroup$

              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 Feb 8 at 17:07









              awjloganawjlogan

              3,85211328




              3,85211328












              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                Feb 8 at 17:09






              • 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
                Feb 8 at 17:14










              • $begingroup$
                @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
                Feb 8 at 17:33


















              • $begingroup$
                But in case with Arduino Nano(for example), it doesn't help.
                $endgroup$
                – SilvioCro
                Feb 8 at 17:09






              • 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
                Feb 8 at 17:14










              • $begingroup$
                @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
                Feb 8 at 17:33
















              $begingroup$
              But in case with Arduino Nano(for example), it doesn't help.
              $endgroup$
              – SilvioCro
              Feb 8 at 17:09




              $begingroup$
              But in case with Arduino Nano(for example), it doesn't help.
              $endgroup$
              – SilvioCro
              Feb 8 at 17:09




              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
              Feb 8 at 17:14




              $begingroup$
              @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
              Feb 8 at 17:14












              $begingroup$
              @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
              Feb 8 at 17:33




              $begingroup$
              @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
              Feb 8 at 17:33











              5












              $begingroup$

              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











              $endgroup$


















                5












                $begingroup$

                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











                $endgroup$
















                  5












                  5








                  5





                  $begingroup$

                  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 Feb 8 at 17:17

























                  answered Feb 8 at 17:10









                  Electric_90Electric_90

                  1,565519




                  1,565519























                      2












                      $begingroup$

                      It indicates the location of pin 1






                      share|improve this answer









                      $endgroup$


















                        2












                        $begingroup$

                        It indicates the location of pin 1






                        share|improve this answer









                        $endgroup$
















                          2












                          2








                          2





                          $begingroup$

                          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 Feb 8 at 17:07









                          uglyoldbobuglyoldbob

                          1367




                          1367






























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