Screaming Circuits: Via in Pad

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Re-runs

I've been pretty occupied with the upcoming Embedded Systems Conference in Boston. The exhibition is next week on Tuesday, the 21st and Wednesday the 22nd. Screaming Circuits will be in booth 809. Stop by if you happen to be at... Read more

Via-In-Paste

I've heard of vias in pads, but vias in paste aren't so common. Here's a QFP footprint with a lot of thermal vias in the center pad area. I'm guessing all of those vias are necessary for heat removal, but... Read more

Vias between BGA pads

I ran across a question posted on the Xilinx forum recently about whether vias in BGA pads needed to be capped, as suggested in my post about that subject. We do recommend that the vias be filled and capped with... Read more

Another Via-in-Pad reason

Just the other day - No not that one. The other one - I was reading through some of the open source Beagleboard information again and I came across an interesting tid bit. In one of the early revisions, they... Read more

How to Fill a Via

We here at Screaming Circuits keep telling people to fill and plate over vias in BGA pads. The same goes for small passives too, like 0402s and 0201s. As I closed in this post, best option is to fill and... Read more

Via in pad - tenting the bottom side

Speaking of vias in pads, here's a reason we're not terribly fond of the technique of using solder mask to tent the bottom side of a via in a BGA pad. As I mentioned in my last post, capping the... Read more

Large Via In Pad

I haven't written about via in pad in a while, but the issue hasn't quite gone away yet. This particular QFN, to the left, has the vias tented, which is good. However, it could be better. If you look close,... Read more

Crooked Components

I was looking at two different PCBs recently; one assembled here at Screaming Circuits, and one, a PC graphics card assembled someplace else in the world. In both cases, a crooked component caught my eye. The graphics card, at least,... Read more

Toyota is as Toyota does

Everyone else seems to be writing about Toyota sudden acceleration problems, so I should probably do that too. Or should I? Personally, I have absolutely no solid information about what's going on with Toyota cars. There's an awful lot written,... Read more

Inverted QFN Land Pattern

Have you ever experienced the heartbreak of inverted land pattern? It's not supposed to happen, but every now and then, it does. Maybe something happened when creating a custom footprint. Maybe, somehow it got inverted in the CAD software and... Read more