Blog - Screaming Circuits

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

QFN Center Pad revisited

The QFN (quad flat pack, no leads) package can no longer be considered exotic. It was when I first wrote about it a decade ago, but not any more. In fact, with the wafer scale BGA, it's one of the... Read more

Out of Ideas and applied Heisenberg

Every now and then, most of us seem to run out of ideas. Then, like the proverbial high school term paper, with a subject requirement of: “Pick a subject you’re interested in”, we struggle to come up with what to... Read more

Eclipse-o-pocalypse 2017

Save the date: August 21, 2017. I don't need to tell you what's happening that day, but I will anyway. It's total eclipse day here in the USA. I wouldn't care too much, except; a) I think total eclipses are... Read more

Never Take Pin Numbering For Granted

Our all-things-about-electronics manufacturing standards body, the IPC, specifies the proper numbering order for most components. That's a pretty nice thing that they do there, but it's not always enough to prevent layout mishaps. Case in point a line of small... Read more

Components So Fragile, They Break Before Arrival

There are a lot of components that require special handling. Some days, "special" requirements seem more the norm than the exception. But, every now and then, we see something that puts even those special components to shame. Not long ago,... Read more

What's So Difficult About Diodes?

A diode can be put on a a PC board in one of two ways. It's only got two pins (usually - see, already, Iv'e got a caveat.) I've written about them a few times before. I've got a sampling... Read more

What Makes a Good Fiducial?

Accountants may have a fiduciary responsibility, but that really has nothing to do with PC board assembly. Change the "ry" to a "ls", however, and you get fiducials, which does have something to do with PCB assembly. A fiducial is... Read more

Announcing New NAND-Compression BOM consolidation service

Screaming Circuits is proud to announce its newest prototype and low-volume manufacturing related service offering: NAND-compression BOM (bill of materials) consolidation. One of the ongoing frustrations in the electronics design design world relates to the explosive rate of introduction of... Read more

Let's Talk About HAL - And Another Thing

A few days ago, I wrote about HASL PC board surfaces, explaining that it's not an appropriate choice for small parts. Look at the same PCB image as I used yesterday. You might not recognize it because yesterday, it was... Read more

Let's Talk About HAL - For Big Parts Only

The board surface names: HAL and HASL (hot air leveling and hot air surface leveling) refer to the same thing. They are interchangeable terms. With that out of the way, I'll get to my point, which is that HASL is... Read more