Screaming Circuits: QFN and DFN

PROTOTYPE AND SMALL VOLUME
PCB ASSEMBLY MADE EASY

More CAD footprint woes

AT this point, I really shouldn't call them "woes." More like business as usual. I'm talking about the need to make custom footprints, or at leas modify footprints. Back in the old days, the only thing needed to make footprints... Read more

"Shrinky Dink"

I had some "Shrinky Dinks" when I was a kid. Amazingly you can still buy them. You can also use that concept in your prototyping. I did that recently. I have a robot board design that I'd like to shrink... Read more

Oh MSOP, My MSOP

In the land of protorypes, sometimes "close enough" is good enough. That can save money on PC boards and assembly when a particular package version of your part is out of stock. But, it's not universal. Sometimes you can't go... Read more

QFN Stencil Gerber

In the previous epside, Wally’s attack on Dilbert’s kingdom prompts Ratbert to perfect an “N”-Ray, to be discharged from a powerful Nullitrion, to neutralize and render useless Wally’s power plant. Dilbert tells Dogbert the Nullitrion can best be directed against... Read more

QFN Custom Stencil Layer in Eagle

It's been said over and over that you don't want to leave the solder paste opening wide open for a QFN center pad. 50 - 75% paste coverage will get you bets results. With full coverage, your QFN can end... 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

Hand To Machine

It's getting very difficult to hand solder many parts these days. Some people give it a try, but in general, if you're dealing with the really tiny parts or leadless parts, it's just not possible, or at least not practical.... Read more

Narcissistic Parts

Maybe not completely narcissistic, but at least self-centered. Or, self-centering. Okay, are you lost now? Am I making any sense at all? Well, I'm going to say that it doesn't matter, because the world-revolves around me. But what I am... Read more

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

AT Tiny is Tiny

I just spotted a note on Twitter, from SiliconFarmer, referring to the ATtiny44A coming in a 0.45 mm pitch QFN as well as a 0.5mm pitch MLF package. (In practice, an MLF is the same as a QFN, by the... Read more