These are the GNZ5 16 Gigabit, or 2 Gigabyte, NAND Flash chips from SanDisk & Toshiba.
These could have been made into solid state storage devices like USB flash drives, however their most iconic use would have be as the main storage in the Iphone 3G & 3GS. Four of these would have been stacked together like shown in this video, and wirebonded together to make up the 8GB part, for example.
Each chip measures 16x11 mm and is less than a ¼th of a mm thick, allowing them to be easily stacked. The features on these chips are extremely small, and even hard to see at 500x magnification. If all 16 Gigabits took up the entire chip area (which they don’t) that would mean that each bit would be approximately 11 nanometers. In reality though, this device is an MLC NAND, meaning that each cell stores 2 bits instead of 1, reducing the total number of cells needed.
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