PCB Fiducial Placement and DFM Rules for SMT Assembly
August 7, 2026
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
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
IPC Class 2 suits products that require long service life when temporary downtime and field repair remain acceptable. IPC Class 3 applies when operation on
PCB core and prepreg are different material forms used for different functions in a multilayer stackup. A core is cured laminate, normally supplied with copper
ENIG and ENEPIG are both flat, solderable PCB surface finishes. ENIG uses electroless nickel and immersion gold. ENEPIG adds an electroless palladium layer between the
Neither structure wins every stripline vs microstrip comparison. Microstrip places the signal on an outer layer, which favors direct component launches, probing, and fewer layer
A PCB annular ring is the copper land between a drilled hole and the outer edge of its pad. For a centered circular pad and