Hi, im making a small pcb for conecting af usb device and a powered usb hub.
This is my first pcb and im not sure if 1 via or 3 vias is enough for for power and grounds.
I have tried calculating it, but im still not sure.
The version with 1 via I have a 0.4 mm drill and a 0.8 mm pad
The version with 3 vias I have a 0.3 mm drill and a 0.6 mm pad
Any help would mean alot

 

Why not one larger via?

 

On my boards, I tend to go the way of multiple small vias myself

 

On my boards, I tend to go the way of multiple small vias myself

So my version with the 3 0.3 mm vias can carry around 2.3 amp. Do I then just add the 3 up, and get 6.9 amp (nice). That should be enough for usb power delivery. I should also be able to make them smaller.

Is that right?

 

For USB current of 500mA, one via will do.
Better yet, use a plated through pad. For higher current, solder a wire in the hole.

 

The pad(s) seem large enough compared to the trace leading to the pad. If concerned about the capacity of the pads, have you calculated the current capacity of the traces themselves?

 

The pad(s) seem large enough compared to the trace leading to the pad. If concerned about the capacity of the pads, have you calculated the current capacity of the traces themselves?

It was just the easyest place to show it, so just used a data conection to demonstrate