This is how we are doing it at Inter-Tel.

Top side fiducials
Top layer   ----   copper circle 40 mils dia
Clearance "Void"  on all other layers 80 mils dia

Bottom side fiducials
Bottom layer  ----  copper circle 40 mils dia
Clearance "Void" on all other layers 80 mils dia

We place at least three global fiducials on a PCB and more if the pitch
falls below 50 for a component.  These fine pitch components get one or two
of their own called a local area fiducial.  The local area fiducials can be
located inside the component outline.  We also document the fiducials XY
location on a table on the assembly drawing.

Cyrus Ringle
Sr. CAD Specialist at Inter-Tel ---- http://www.inter-tel.com
7300 West Boston Street
Chandler, AZ 85226
Email [log in to unmask]
Voice (602) 961-9000 x21216 or 961-2263
Fax (602)961-1370

Vice President of the Greater Phoenix Designers Council ----  A part of the
IPC http://www.ipc.org/html/framesetdestypes.html
PO Box 3805
Scottsdale, AZ 85271




Randy Decker <[log in to unmask]> on 10/23/98 01:05:07 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to Randy Decker <[log in to unmask]>

To:   [log in to unmask]
cc:    (bcc: Cyrus Ringle/Inter-Tel)
Subject:  [TN] IPC Standards for Fiducials




Hi All,

        Would anyone Happen to know the IPC Specification # for Fiducials,
or Would anyone have any recommendations on Shape and size of Fiducials.

                Thanks in advance.

                        Randy Decker

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