T00900 - SEMI T9 - Specification for Marking of Metal Lead-Frame Strips with a Two-Dimensional Data Matrix Code Symbol

This Specification provides a marking symbology that can be used to mark metal lead-frame strips. This Specification defines the geometric and spatial relationships and content (including the error checking and correcting code) of rectangular two-dimensional (2D), machine-readable, binary Data Matrix symbology for front-surface marking of metal lead-frame strips (also called ‘strips’). It may be used in conjunction with the alphanumeric marking codes specified in SEMI M12 and SEMI M13.   This Specification defines a 22-character default message that is included in all marks, and option for up to 50 additional characters, for a total of 72 message characters. An optional shorter message contains 12 to 16 message characters; the resulting square field is narrower but taller than the 22-character rectangular one.   This Specification provides a suggested location for the code symbol. It also provides guidelines for specifying other code locations when the suggested location is not