BC412

BC412 is a proprietary symbology that was developed by Computer Identics and IBM in 1988. In 1992, it was adopted by the Semiconductor Equipment and Materials International (SEMI) organization as a standard for marking serial numbers on silicon semiconductor wafers for identification.

The "BC" in the symbology name stands for "binary code," and the "412" is derived from the fact that each character is encoded by a set of four bars in 12 module positions. BC412 is a single-width code, meaning that all bars are the same width. This provides better readability on the low-contrast wafer surface than multi-width bars would provide. The symbology is well-suited for encoding data in small spaces.

BC412 is defined in the BC412 Barcode document and in the SEMI T1-95 standard.

ClosedSymbol Structure

ClosedCharacter Set

ClosedCheck Digit

ClosedDensity