Who knows via in PCB design?

"How-to" questions from new engineers and designers. Please ask and respond here.
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Joyce Taylor
Posts: 5
Joined: 12 Jul 2020, 22:22

Who knows via in PCB design?

#1 Post by Joyce Taylor » 24 Jul 2020, 05:29

Is it recommended to put the vias in the middle of the pad? I am making a 4 layer PCB. I want to connect the SMD(package 1210) components from the 1st layer(signal layer) to 2nd layer (ground). So Can I place the via in the mid of the component pad or should I place it near to the component and connect it through a track?

Thanking in advance.

Mike Dong
Posts: 18
Joined: 06 Nov 2018, 02:27

Re: Who knows via in PCB design?

#2 Post by Mike Dong » 30 Jul 2020, 02:18

No it is not. Make a small trace and put the via there. The reason is the via can suck up the solder and make the pad dry if you are reflowing. Also, the via may be off-center if the pad is small. But if the via is small and the pad is large, and you are hand soldering you could probably get away with it. In either case, make the via as small as you can.
When you really do need a via in the middle of the pad because space is tight (like breaking out a BGA) special measure are taken that have to be specified to the board house.

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