Hitachi has developed the world’s smallest Radio Frequency Identification (RFID) chip, measuring just 0.4 x 0.4 mm.

The “µ-Chip” features a 128-bit ROM that can store a 38-digit number. The significant reduction in size was possible due to an innovative manufacturing process called Silicon-on-Insulator (SOI), where an insulation layer and a monocrystalline silicon layer are formed upon the silicon base substrate, and the transistor is then formed on this SOI substrate.

As most of the other RFID chips available on the market, the µ-Chip uses an external antenna to receive radio waves, which are then “translated” and broadcast as a unique ID number. The actual data is inscribed during the manufacturing process on the ROM chip, which means that it can’t be overwritten, thus enhancing the chip’s level of security.

Atricle taken from Softpedia