BGAs and Package on Package

POP with dimeTake a look at the closeup of one of our Beagleboards here on the right. That's what package on package (POP) looks like up close. The bottom chip is a Texas Instruments OMAP processor, in BGA form with 0.4mm pitch solder balls. It has a land pattern on its top for the top layer, which is a Micron memory chip in 0.5mm pitch BGA form.

A few years back, we built a small handful of Beagleboards ourselves, just to showcase our POP capabilities. It's hard to believe that we did that back in 2009. The Beagleboard has undergone a few iterations and spawned the Beaglebone since then, but 0.4 mm pitch is still pretty small.

Small, but not really all that uncommon anymore. "Smaller" is on the way. In fact, though it's a special process, we've even built a few 0.3mm pitch BGAs.

If you're joining the fun and starting to use on of the Ti 0.4mm pitch BGAs, you might want to take a look at what we learned from the Beagleboard folks about the land pattern.

Duane Benson
The sandwich needs pickles.

National High Voltage AC month

N_TeslaIn honor of Nikola Tesla, hero to engineers', birthday (July 10, 1856), Screaming Circuits has declared this to be National High Voltage AC Month.

For those of you who don't know Nikola Tesla... Never mind. If you don't know who he is, you're probably not an actual engineer. If you are an engineer, but still don't know, I challenge you to use your powers of self-education, and spend a little time learning about the person who pretty much made the modern world possible.

Part of our homage comes in the form of a free T-shirt. Every customer who places an order before August 10, 2014, 5:00 PM, PST, will have the opportunity to get a Free "National High Voltage AC Month" T-Shirt, designed by local graphic artist, Kyle DeVore.

T-shirtLook for instructions via email on how to get a free T-shirt after your next order (provided the order is placed between today and on or before August 10). If you place an order between now and then, and promptly respond to the email, you can get one for free.

But, what if you don't have anything to order? Well, you can still celebrate life threatening high voltage induction by buying a T-shirt from our page on (link here).

Any profits from the sale of the shirts will be donated to the Tesla Museum at Wardenclyffe.

How Teespring works: Orders can go in during a 21 day window. If you buying one, you don't get charged until the closing date. After that, they send you the shirt about a week or so after. They send any profits we made on the shirt directly to Tesla Science Center at Wardenclyffe; a 501(c)3 not-for-profit organization registered with the State of New York.

If you're a recipient of one of the free shirts, you won't pay anything. Your shirt will be mailed at about the same times as the paid shirts.

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