Screaming Circuits: Parts Form-factors

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Land Patterns - Equal and Not Equal

I was recently asked a question about QFN package varieties. The questioner wanted to know if different package variants of 16 contact QFN packages, such as HUQFN, DHVQFN, SQFN and such, all shared the same footprint. If they did, the... Read more

Window Pane in not a Pain

QFN parts (also known as MLF or Micro Lead Frame) parts used to cause a lot of problems a few years ago, as evidenced by the number of blog posts covering the subject. Can I use my own blog as... Read more

Easy Reading for a Long Weekend

The holiday is upon us and most folks here in the US will have a three day weekend. Of course, when you're an engineer on deadline, all too often holidays don't really mean that much. Here's a little food for... Read more

0.4mm Pitch BGAs - Staggered?

I wrote not long ago and not far, far away about the type of pad recommended for 0.4mm pitch BGAs, as in non-soldermask defined vs. soldermask defined (NSMD vs SMD). The wisdom being that with the pads being so close... Read more

Extra Fine Pitch BGA pads

One of the annoyances of the world of trade secrets and proprietariness is that we can't all learn from each others' experiences. That is important and even generally necessary in a competitive world. If you put in some hard work,... Read more

Why Those Castle Walls?

When I pick a subject, I seem to get moderately obsessed with that one topic and I'll end up covering it over and over again. I don't mean to. It just tends to happen that way. Castellated mounting systems seems... Read more

Using Package on Package (POP)

Back in August of 2009, we at Screaming Circuits assembled our first package on package chip set. We did a number of test components first to tune the process and then built up some Beagleboards. We've done a few more... Read more

Castellated / Half-Vias, parts 2 - 255

I've written about the Castellated / half-via mounting system a couple of times in the past. Now I can't seem to avoid them. I'm seeing them everywhere. The GPS I recently wrote about, low noise amplifiers, POL power modules, frequency... Read more

Castellated / Half-Vias

Modules with castellated mounting holes are showing up more and more these days. I've also heard it called a "half-via" setup. Both seem to fit. The copper mounting pads on the bottom of the module's little PCB wrap up the... Read more

Foot Prints

I write a fair amount about component foot prints / land patterns / CAD library components - whatever you call them. What are you supposed to call them anyway? I've heard them called all three of those things and a... Read more