I started out by using one of the fiducials you guys have listed with
a pad as a sub-element. However when I started reviewing my PCB with
my assembler rep he noticed that their would be a hole in the stencil
causing solder paste to be applied to the fiducial. I changed to the
pin with zero size hole and the paste is naturally gone. However now
I have fiducials on both sides with a big hole in my GND plane because
of the clearance to the GND polygon. So, is their a way to get PCB to
not put paste on a pad so I can go back to having a fiducial on one
side of the board?
Thanks,
Jeff
On 9/11/06, Phil Taylor <[EMAIL PROTECTED]> wrote:
> standard libraries? Has anyone posted fiducials that I could use as a
> starting reference?
>
> Thanks a lot for your assistance guys.
> Jeff
Jeff,
Here are three fiducial footprints. First is a top-layer pad only.
Second is a 50 mil pad with a 100 mil clearance circle and a 100 mil
soldermask opening.
Third is the same as second but with a 175mil clearance circle. This is
the one I see the most on other peoples' pcbs.
The 2nd and 3rd version appear on all layers. Please let me know if
they work out for you.
phil
_____
Element[0x0 "FIDUCIAL__pad-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pad[0 0 0 0 5000 5000 10000 "" "1" 0x000]
)
_____
Element[0x0 "FIDUCIAL__pin-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pin[0 0 5000 5000 10000 0 "" "1" 0x001]
)
_____
Element[0x0 "FIDUCIAL__pin-50-175-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pin[0 0 5000 12500 10000 0 "" "1" 0x001]
)
Element[0x0 "FIDUCIAL__pad-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pad[0 0 0 0 5000 5000 10000 "" "1" 0x000]
)
Element[0x0 "FIDUCIAL__pin-50-100-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pin[0 0 5000 5000 10000 0 "" "1" 0x001]
)
Element[0x0 "FIDUCIAL__pin-50-175-100.fp" "" "" 0 0 0 0 0 100 0x0]
(
Pin[0 0 5000 12500 10000 0 "" "1" 0x001]
)
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