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what should we do for pins that must be not connected ?

e14 Contributor

I am creating a component in the EAGLE library with only 3 pins and two others for the good fix, and after that I connect the pins, the two mounting pins I do not know what to do with, have you have any ideas?

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  • in reply to e14 Contributor

    Hello,

     

    "Electrically" speaking, it's best to connect them to GND (floating metallic part are not good (in particular for radio/audio applications), and if the end-user can touch this metallic part, make sure to choose a signal that is safe for him, that why GND is a good choice).

    But I prefer to select a 'NC' direction for the pin, so I can choose to connect to an other signal in schematic. Useful when in one design you have different GNDs

    And usually, if theses two pads are electrically connected (by the part it self), then I create only 1 pin on the device, and I associate the two pads to this one pin. So I can not connect these 2 pads to 2 different signals (ie a short-circuit).

     

    "Mechanically" speaking, if this part must support some mechanical effort (if it's a connector, a switch etc...) these pad plays the fixing role. So connecting to a big plane is a good thing, specially if there are SMD type.

     

     

    Guillaume.