Screaming Circuits: Via in Pad

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Via in pad refresher

Via in pad refresher
It's a good time for a via-in-pad refresher. It's not quite as hot a topic as it has been in the past, but it's still a very important consideration. It's always a bit controversial. The assembly process folks pretty much... Read more

Beware open vias near pads

Beware open vias near pads
Having open vias in pads is just about the number one "do not do" when creating a printed circuit board. Number two or three is don't have open vias near pads without a solder mask dam to stop the flow... Read more

No Open Vias in or near pads

No Open Vias in or near pads
The term "via" probably comes from the Latin word meaning "road." Therefore, open via would essentially mean "open road." Open roads, here in Oregon sometimes run through open range ranch land. That means that cows have as much right to... Read more

Via in Pad - Why and How

Via in Pad - Why and How
There are many reasons you shouldn’t use via in pad. It’s not good practice, and those via holes act like little capillary straws and suck solder off of the pad or the BGA. That said there are some applications that... Read more

Super Small Via In Pad

Super Small Via In Pad
Via in pad is an old issue that still pops up now and then. Our standard answer hasn't changed: No open vias in pads. But one of the questions we get related to the subject is: "What if we make... Read more

Via in Big Pads

Via in Big Pads
The answer to the question: "is it ever okay to put open vias in BGA pads?" is simply No. It's no, no, no, no, not ever!!! That makes it easy. No technique to worry about. No tolerances. Nothing. Just don't... Read more

Via in Pad x 8

Via in Pad x 8
Here's an interesting via in pad case. On the one hand, the footprint is very symmetrical and clean looking. On the other hand, it has open vias in the pads. At first glance, I thought this was a DIP footprint... Read more

How not to treat your BGA friends

How not to treat your BGA friends
Over the years, most of what we see are good PC boards. But some standout in the other direction as examples of what not to do. Some didn't make it through the board house alive. Some were unknowingly rendered useless... Read more

BGA pads with Vias

BGA pads with Vias
No. This isn't a closeup of an owl face. There is still some debate on how best to create a land pattern for a 0.4mm pitch BGA. We recommend soldermask defined pads at that pitch. But that's not really what... Read more

Small Open Vias

Small Open Vias
Parts change and so do vias. Our standard policy here is that open vias in pads are bad. We from time to time recommend ways to plug them. Generally, you have several options. Like this post shows. However, with vias... Read more