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Is this correct? Is it good?

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  • Is this correct? Is it good?

    hi

    Is this routing appropriate? Click image for larger version

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  • #2
    For power pins (including GND) I always try to have 1 through hole via per pin. Only if not possible (e.g. no space on bottom for components), only then I can connect more than 1 power pin to 1 via. So, personally, I would not route it that way.

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    • M. Namvar
      M. Namvar
      Member
      M. Namvar commented
      Editing a comment
      thank you
      another question: can I connect the power pins to a power plane with uVia? I mean why do you use through-hole via and go to the bottom layer?

  • #3
    robertferanec
    Administrator
    robertferanec do you still have access to that simulation tool from Keysight?
    What is the effect of multiple pads per single via (like this BGA and with multiple capacitors).
    Or a structure like in the picture below...
    Click image for larger version

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    • #4
      What is the effect of multiple pads per single via (like this BGA and with multiple capacitors).
      - it is a lot about inductance

      I would recommend you to watch my Decoupling capacitor youtube video series to understand how important it is to keep connections of capacitors short:
      https://www.youtube.com/playlist?lis...uvkR_TjpnF1Z7f

      Very simply to say, if you have a capacitor which is connected by a long track, it is not going to do good. Therefore you would like to have as short connections from pads to vias as possible.

      I know this doesn't answer you question directly, but, there is no really reason to simulate it as I would not recommend to use it for the reasons above.

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      • #5
        can I connect the power pins to a power plane with uVia?
        - occasionally I do that (if there is no other way), but through hole via connection is better for powers.See my answer below ..

        I mean why do you use through-hole via and go to the bottom layer?
        - through hole via provides better connection (lower inductance, higher currents possible, ....) comparing to the uVIAs which I use.

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