Determining trace/via/wire current capability


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  1. #1
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    Default Determining trace/via/wire current capability

    Last edited by Demon; - 30th July 2024 at 01:02.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

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    Default Re: Determining trace/via/wire current capability

    Valuable source of info.

    Thanks for sharing,
    Ioannis

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    Default Re: Determining trace/via/wire current capability

    If you want to increase trace/via capacity without increasing their size (maybe it complicates the rest of your circuit), just make more.




    In my case, the 7805 voltage regulator takes the brunt of all components downstream, so that's where I increased their number.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

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    Default Re: Determining trace/via/wire current capability

    Put vias under component. Make bottom copeer pad large, and you have much better heatsink capabilites.
    Make via also untinted ut botom, so you can fill it with solder. For my taste your trace to via are too small(I know it is only signal, but...).
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    Default Re: Determining trace/via/wire current capability

    I understand that you use Eagle.

    How can you prevent solder mask at the area of the VIAS under the smd component?

    Ioannis

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    Default Re: Determining trace/via/wire current capability

    Yes it is eagle...
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    Default Re: Determining trace/via/wire current capability

    Also, you can draw any shape on that layer, and solder mask will be removed from that area.

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    Default Re: Determining trace/via/wire current capability

    Great!

    Thank you,
    Ioannis

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    Default Re: Determining trace/via/wire current capability

    Quote Originally Posted by pedja089 View Post
    Put vias under component.
    How is this?


    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

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    Default Re: Determining trace/via/wire current capability

    I went one further using vias after adding cooling; grounding the VSS pin on the voltage regulator with 3 large vias.

    This way it doesn't mess up the smaller vias I have on signal traces and VSS pins on tiny SMD ICs.


    CORRECTION:

    These are labelled backwards. The 7805 uses the TO-263 package and the Hexfet uses D2Pak (in my project).

    Last edited by Demon; - 30th July 2024 at 02:36.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

  11. #11
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    Default Re: Determining trace/via/wire current capability

    Quote Originally Posted by pedja089 View Post
    ... For my taste your trace to via are too small(I know it is only signal, but...).

    JLCPCB can support up to 0.15 vias. I'm using 0.3 hole/0.5 pad since I'm using 2 layer PCBs.

    https://jlcpcb.com/capabilities/pcb-capabilities


    I'm not finding any "ideal dimension" for signal traces on the web...? They seem unanimous to say "however small your PCB fabricator can handle".

    I'm using:

    - 0.2 traces default,
    - 0.3 for USART/USB,
    - 0.3 for VDD.
    Last edited by Demon; - 30th July 2024 at 00:59.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

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    Default Re: Determining trace/via/wire current capability

    Quote Originally Posted by Demon View Post
    I'm not finding any "ideal dimension" for signal traces on the web...? They seem unanimous to say "however small your PCB fabricator can handle".
    PCB design is a bit of art. So, rules do apply but you can bend them (within reason of course) using common sense.

    Nice touch the cooled grounding. Never thought of that. Though I do not know how much will contribute in cooling if the main tab is big enough.

    Ioannis

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    Default Re: Determining trace/via/wire current capability

    Top is usualy bit tight with space, So I make GND al large as I can on bottom.
    Uart usualy don't require any special routing. I usualy use trace width of smalest IC pad.
    For USB it depends on lenght. It usualy doen't meter. But if it is long, it is critical to have diff pair with proper impedance....

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    Default Re: Determining trace/via/wire current capability

    Quote Originally Posted by Ioannis View Post
    ... Nice touch the cooled grounding....

    The vias in the VSS pin is not for cooling; it's just to get the current to the bottom side with more via conduit.

    If I increase VSS via size, it messes up my spacing close to the TSSOP ICs.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

  15. #15
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    Default Re: Determining trace/via/wire current capability

    Quote Originally Posted by pedja089 View Post
    ...USB it depends on lenght. It usualy doen't meter. But if it is long, it is critical to have diff pair with proper impedance....

    I read that people have been getting away with what they consider sloppy traces.

    My USB traces are 20cm long, running side-by side, far from any large current. My application does not have to support USB 3.0, 2.0 is plenty fast for me.
    My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.

    Not as dumb as yesterday, but stupider than tomorrow!

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