PCB Fiducial Placement and DFM Rules for SMT Assembly
PCB fiducials are exposed copper reference marks used by SMT equipment to align the real board or panel with programmed CAD coordinates. Stencil printers and pick-and-place machines use them to correct X-Y offset and rotation before paste printing or component placement.Good fiducial design depends on optical contrast, mark geometry, spacing, board-side access, panelization, and the […]