Panel Fiducial Marks and Image Fiducial Marks
Size/Shape: a solid filled circle with a diameter of 1.0 mm.
Solder mask opening: 2.00mm in diameter and concentric with the Fiducial.
Covering copper: an octagonal copper ring 3.00mm in diameter concentric with the Fiducial and clearance
Area.
Local Fiducial
Size/Shape: a solid filled circle with a diameter of 1.0mm.
Solder mask opening: 2.00mm in diameter and concentric with the Fiducial.
Covering Copper: not needed.
Position of Fiducials
In General: PCBs which require SMT automated assembly must have Fiducial marks on the necessary
layers. PCBs which only require manual soldering do not require Fiducial marks.
For single-sided boards, Fiducial marks are only required on the side where the SMD components are to be
soldered.
For double-sided boards, both sides must have Fiducial marks. The position of the Fiducial marks must be
generally consistent (except for mirror panels).
Panel Fiducial Marks
Panel Fiducials and image Fiducials should be located on the panel margins and on individual
sub-boards respectively. There should be three panel Fiducials per board and three local Fiducials per
sub-board, arranged in an ‘L’ shape as far from each other as possible, as shown below:
Image Fiducial Marks
There must be three Fiducial marks per sub-board, arranged in an ‘L’ shape, located as far as possible
from each other. The distance from the origin of the Fiducial mark and the edge of the sub-board should be
greater than 6.00mm. If it is not possible to ensure that the four edges satisfy this requirement, then the
requirement must be satisfied for the primary side at least.
Local Fiducial Marks
For devices with gullwing pins and a pin pitch of 0.4mm, and surface array packaged devices with a
pin pitch of 0.8mm, local Fiducial points are required.
Two local Fiducial marks are required per component and must be symmetrical on both sides of the origin of
the component.
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