Wafer Size

the diameter of a wafer. Wafer sizes for 2 inch and 3 inch wafers were in inches, wafer sizes for all larger wafer diameters are in millimeters. Many people refer to a 4, 5, 6, 8 or 12 inch wafers, but it in fact a "4 inch wafer" is 100 millimeters , 3.937 inches.