An 8-inch wafer, a round wafer with a diameter of 200mm, is one of the commonly used sizes for making chips. So how many chips can be made into an 8-inch wafer?
First of all, it is necessary to understand the process of making chips, including wafer cleaning, dicing, lithography, coating and other processes. Whereas, in wafer dicing, the wafer is divided and the wafer is cut into small pieces of equal size, i.e., chips.
The size of the chips depends on the number and shape of the cuts, so it is possible to calculate how many chips can be made on an 8-inch wafer.
Specific algorithms:
Suppose the area of each chip is 00625 square centimeters (that is, 1 square millimeter), then the area of the 8-inch wafer is 314 square centimeters (diameter 200mm), then the number of chips that can be made of the 8-inch wafer is:
The number of chips that can be made on an 8-inch wafer = wafer area and chip area.
The number of chips that can be made on 8-inch wafers = 314 square centimeters 00625 square centimeters.
Number of chips that can be made into 8-inch wafers = 5000.
So an 8-inch wafer can make up to 5,000 chips.
In actual production, why can 8-inch wafers become a common size for making chips?
First, 8-inch wafers are more economical and practical because they are cheaper to manufacture, have shorter wafer dicing and processing times, and are more productive than smaller wafers. Secondly, compared to larger wafers, 8-inch wafers have better wafer quality and fewer crystal defects, so the chip is made with higher quality.