scope:

This SMEMA standard is for fiducial marks. It was developed to facilitate the accurate placement of components on printed circuit boards.

SMEMA standards have also been developed for Mechanical/Electrical Equipment Interfaces (1.1) and for Software/Communications Interfaces (2.0). Equipment and printed circuit board features may conform to one or more of these standards. Only some of these requirements may be applicable to a specific application.

Purpose:

The purpose of this standard is to provide common measurable points for all steps in the printed circuit board assembly process. Compliance with these requirements will allow each piece of equipment used for surface mount assembly to accurately locate component land patterns.