Ground plane connection to a through hole pad

[ballimo]

ground plane connections

Hi All,

I have a board with 8 internal ground layers(Planes), I have some through hole connector, and I 'am using Allegro PCB editor; by default a ground through hole pad will connect to all the 8 internal ground layer.

I want to connect each through hole ground pad to a maximum of 3 ground planes, did anyone know how I can do it? (because if ground pad will connect to 8 planes I will have a problem during the soldering process.)

Thanks for your help...

Ballimo

 

[FvM]

ground plane connect

If Allegro allows definition of padstacks with different pads for individual inner layers, it would be a solution. Otherwise, you have to add antipads or voids to the respective power planes manually. Thermal isolation of pads doesn't help?

 

[ballimo]

ground plane connection

If Allegro allows definition of padstacks with different pads for individual inner layers, it would be a solution. Otherwise, you have to add antipads or voids to the respective power planes manually. Thermal isolation of pads doesn't help?

Thanks for your reply, I have a big number of ground through hole pads if I have to add voids to the power planes this will take a huge amount of time. for Thermal isolation I'am using in my board thermal relief spokes (4 on each ground plane), but when these thermal spokes are connected to 8 planes we will have a problem.
allegro allows definition of padstacks with different pads for inner layers but how can this help? Many thanks.....

 

[Anonymous_Ricky]

through hole pad

hi,

in allegro(in fact i think most of the tools) you have option for defining pad size for each of the internal layer.
Just provide the pad size for three layers in which you want the connector pins to connect and for rest of the layers make the pad size zero(they will have drill or we can say the pad will act as NPTH for those particular layers. ).

Regards,

Ricky