Screaming Circuits: June 2011

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

Family Reference

I've written a bit about reference designators here and there. There are a few more factors that we run into now and then. Take the family panel. In case you aren't familiar with the term, it means that you have... Read more

Favorites

What's your favorite MCU package and why? The DIP is big and easy to use. You can stick it in a breadboard (wireless or soldered), a socket or easily hand solder it. But, it tends to be more expensive and... Read more

Via Current Capacity

Over on the Circuits Assembly blog, Michael asked a question about my Via in Pad Myth #5. He asked: "I have a question about vias. I have seen charts on the current carrying capacity of traces, but what about vias?"... Read more

Via-In-Pad Myth #5.A

I received a couple of good questions on my prior post about vias in QFN or QFP pads: "I have a few questions about the second photo. The thermal vias in the center are masked over, doesn't this make it... Read more

Random Via-In-Pad Myth #5

Myth #5: When you need thermal vias, more is better, bigger is better Hmmm. Logically, this would seem to be the case. There are limits though; especially if you want a reliably assembled product. Older parts with heat slugs easily... Read more

Loopy Ground Loops

A while back, I posed a question about using flood fill (AKA copper pours). I've been reading a lot about ground loops lately which brought me back to that original question. Some people suggest segmenting your ground plane between analog... Read more

Package Variants

Here's another issue we see from time to time involving the old, familiar, 0.1" pitch headers. When initially laying out the board, the footprint for the break-away header is used. It's small and easy to use. The headers are cheap... Read more

And The Race Goes On

The race for the smallest part is still going strong. That and the fact that basic logic gates are still with us is affirmed quite well with a new set of chips from NXP. The 74AUP2G00 is a dual two-input... Read more

« May 2011 | Main | July 2011 »