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Altium PCB design: How small can vias be made?

Working with very limited space (In Altium) and need to place vias to make routes between the red solder castellation plates on the top layer to the respective connector pins on the bottom layer, both shown in the image. Since I have only 0.475mm clearance between the edge of the plates and the edge of the board and need to place the vias in front of the red plates, how small can I effectively make the diameters of my vias? Why does the size even matter?enter image description here

Altium: How small can vias be made?

Working with very limited space and need to place vias to make routes between the red solder castellation plates on the top layer to the respective connector pins on the bottom layer, both shown in the image. Since I have only 0.475mm clearance between the edge of the plates and the edge of the board and need to place the vias in front of the red plates, how small can I effectively make the diameters of my vias? Why does the size even matter?enter image description here

PCB design: How small can vias be made?

Working with very limited space (In Altium) and need to place vias to make routes between the red solder castellation plates on the top layer to the respective connector pins on the bottom layer, both shown in the image. Since I have only 0.475mm clearance between the edge of the plates and the edge of the board and need to place the vias in front of the red plates, how small can I effectively make the diameters of my vias? Why does the size even matter?enter image description here

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Altium: How small can vias be made?

Working with very limited space and need to place vias to make routes between the red solder castellation plates on the top layer to the respective connector pins on the bottom layer, both shown in the image. Since I have only 0.475mm clearance between the edge of the plates and the edge of the board and need to place the vias in front of the red plates, how small can I effectively make the diameters of my vias? Why does the size even matter?enter image description here