I'm analyzing the schematics of Lenovo_G530_N500_-_COMPAL_LA-4212P_JIWA3_JIWA4_-_REV_1.0Sec. I have across scenarios where there is a circle next to a component pin. What does this circle symbolize? I have attached the screen shot for my question.

screenshot of part of a schematic

I have tried looking for a proper answer on the internet, but no satisfactory answer found.

  • 6
    \$\begingroup\$ It usually denotes active low signals. circle is similar to the circle seen in NOT gates. \$\endgroup\$
    – AJN
    Jul 4, 2020 at 11:52

1 Answer 1


The circle denotes that the pin is of type Active Low.

https://en.wikipedia.org/wiki/Logic_level#Active_state tells that it is also indicated by

a trailing #


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