Howard Winter wrote:
> Right - I don't know if they are available here - pretty-much
> everyone sells the 3M ones (including Digi-key over there, I see),
> and they have the annoyingly-wide pins.  I just measured one and they
> are 0.9mm wide,
> 0.45mm thick, giving a diagonal a tad over 1mm.  As far as I can
> measure your holes for P1 are 0.95mm

The holes for the ZIF socket are specified as .029 inch in Eagle.  Allowing
for .004" tolerance from the PC house leaves .025" (about .64mm) max pin
diameter for a sure fit.

> (interestingly, the 5 holes for
> ICSP are about 1.3mm and accept the ZIF pins easily).

That size hole with .1" pitch doesn't allow for traces between the holes.
That's not a big deal for 5 pads, but I don't know what it would have done
to the routing if 2 rows of 20 pins were blocking both layers from pass thru
traces, not to mention the large break in the "ground plane" top layer.

One reason I like these ZIF sockets is that the pad footprint is the same as
a normal 40 pin DIP IC.  In other words, this single footprint can accept a
ZIF socket, a normal 40 pin DIP socket, or a 40 pin IC, and still allow one
trace or ground layer to run between each set of adjacent pads.


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