Screaming Circuits: November 2006


Meet Mark Rules, designer

Mark works for a small company that designs and markets microcontroller development boards and motor drivers. The products tend to be used in small robotics projects, mostly in the education and hobby markets. They are starting to see more and... Read more

Does this scare you?

Not a lot to say about this picture. If this is one of your nightmares, give us a call. Go to our quote page and see what we will charge to help you get some sleep. Then place the order... Read more

Thanksgiving 2006 Closure

We will be closed on November 23rd and 24th. This means that those days won't be counted toward your turn times. For example, if you have asked for a 48 hour turn time and we receive you kit on the... Read more

Let's get small

Are you using components with tiny little QFN packages or 20 mil (.5mm) BGAs? Are you having difficulty getting them built up? We're finding these complex packages showing up more and more often - especially in newer components. In our... Read more

Design Guidelines Library

We've just added our third design guideline PDF. These are documents designed to help you with the most common problems we hear from all of our customers. You can find them on this blog in the right-hand column under the... Read more

Screaming Circuits Process Definitions

If you are new to Screaming Circuits or are new to the prototyping world, it may not be all that clear what we do here or how we look at the pcb assembly world, so here are some definitions as... Read more

MSD Moisture Sensitive Device

Here is something else that RoHS has done to all of us. Some of you may be seeing additional warning labels on your components noting component moisture cautions. This is of most concern for lead-free builds, but may also be... Read more

QFN CAD Libraries

In previous posts (here and here), I've talked about QFN layout issues and solder stencil openings. Here is an example of a the library that follows the component manufacturer's and our recommendations. First step is the copper layer. In this... Read more

DirectFET layout

Yesterday, I noted that we recommend NSMD (Non Solder Mask Defined), or pad defined, pad for BGAs. With the BGAs, the NSMD pads will allow the BGA to sag down just a bit more and adhere to both the top... Read more

Silver and microvoids

Here is yet another reason to use NSMD (non solder mask defined) pads for your BGA placements. We generally recommend NSMD pads for your BGA placements because this technique tends to result in a better mechanical connection. I ran across... Read more

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