Small pitch thru-hole part design

Community PCB Design
1

Hello All!

I am working on a board that requires a Samtech through-hole connector.

Each pin sits at 0.05" pitch (most connectors typically sit at 0.1").

Anyway, I went through the process of designing the

part. In the package editor I made the drill size 0.027559 and the pad diameter to 0.041339.

However, when I came to layout I found that this was not being correctly shown, anyway, found out that

I had to set the design rules under “Design Rules->Restring” to get it to show up correctly. However,

for this to happen I have to set the pads for top/inner/bottom to 5 mil (the default being 10 mil). If I do

not do this then the design rule check fails. Anyway, this works but I am afraid that this may be a

small tolerance for board houses (I plan to use BatchPCB) since the drill has to be dead center for

the given pad size. Does anyone have recommendations? Will BatchPCB be able to handle this?

Also, I looked for parts libraries at Samtech but only found a surface mount part in Eagle, however, they did have

OrCAD libraries for the part I am after. Any one know how to go from OrCAD libs to Eagle libs?

Thank you.

2

If it is not clear, I forgot to mention that the question pertains

to Eagle CAD.

3

Create your own based on the Samtec footprint.

4

Any chance you could post the file? I’ll be needing to create a similar part.

5

Make the pads as large as possible, limited by the clearance rules of your PCB manufacturer. I also suggest elongating the pads - you really want as much copper as possible, to prevent pulling the pads off when force is applied to the connector.

Actually, I suggest using 2mm pitch connectors instead, if possible. They really are much easier to use, and much more robust than 0.05" types.

6

Great - thanks. For me it’s a display with pins at 0.005" so I have no choice if I want to use that display.

Did the board already get made? Any issues?