The 28nm process is the mainstream process of the chip industry five or six years ago, which belongs to the \"outdated process\".
Maybe everyone has no idea about the chip foundry process difference of five or six years.
For example, for mobile phone chips, the original 28nm mobile phone chips are Qualcomm Snapdragon 801 and 805, Apple A7, Samsung Exynos 5410, Huawei Kirin 910 to Kirin 935, Mediatek from MT6572 to MT6755S (Helio P18).
28nm refers to the production of 28nm chips, not only the design of 28nm chip front photolithography machine, etching machine, package lithography machine, etc., the use of silicon disk, wafer coating, wafer lithography development, etching, ion injection and other processes, the processed disk for wafer testing, chip packaging, test packaging and a series of processes. Production of 28nm commercial chip means.
28nm is 28 nanometers, which is 2.8×10^ (-8) m