PCB Assembly Services - Screaming Circuits: Library Oopsies Again


Library Oopsies Again

Rj1_part_to_pad_size Google is hilarious sometimes. (I'll get to the point of the post in a minute) I've got two more examples of parts-libraries gone wrong. One of the parts is an SO-8 wide but I wanted to do a quick double check just to make sure I'm saying the right thing. So, I went to Google images and searched "wide So8".

Sure enough, I had the right package and there were several examples showing that, but I always get a kick out of some of the other things that show up. In addition to the chips, Google also showed a picture of a pair of socks, a picture of "Floaty white chiffon fairy dresses" and honey cakes. :-)

Anyway, back to the point. Here are two more examples where a bit of extra checking would have Img_3285_2 saved  time and money. I'm not sure there's anything we could do with the RJ1 part on the blue board. Maybe, but forget about reliability or mechanical sturdiness. A quick comparison between the CAD drawing and the part should have caused question here.

On the green board, it was an easy to make mistake. The footprint is for a narrow SO-8 and the part is a wide SO-8. Oops.

My advice to you: double check your footprints if you are at all unsure or are using something easy to switch like wide vs narrow.

Duane Benson
Enjoy the honey cakes, but treat the horses well


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Hi Guardian - That's a really good approach. It also helps to ensure that you don't have any component interferences. It's pretty common for us to see a couple of close components where the footprint is correct, but the parts overlap and won't fit.

The trick I use to check my choice of library component is to print out the board to scale (top only for 1 sided placement, both sides separately for 2 sided) and set the part on the paper. That let's me see exactly if the part I chose from the library and the part I want to use have the same foot print or not. This of course doesn't prevent misordering the parts to use, but it sure does help determine if I have to pop open a library and add a new part or not.

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