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 lead pitch
falls below 50 mils 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   CID
IPC Certified Interconnect Designer
CAD Engineer
Inter-Tel, Inc.  http://www.inter-tel.com
7300 W. Boston St.
Chandler, AZ 85226
(480) 961-2263
mailto:[log in to unmask]
President of the Greater Phoenix Designers Council




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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