The NEW version - Nano V3 built on the ATmega168 microcontroller (16MHz) has the small size and can be used together with model boards for solderless wiring (breadboard). It has similar structure with Arduino Diecimila/Duemilanove, but different size. To reduce the size, components are mounted on both sides of the PCB.
The board uses a CH340G chip as a UART-USB converter. Chip CH340G - is a budget solution. With an operation frequency in 12 Mhz, it yields stable result of a data interchange (for correct installation of drivers on the computer follow the instruction).
Nano V3, can be powered via microUSB port (up to 500mA). External power supply 6-12 V unregulated output VIN, or 5 V external power source to regulate output of 5 V. The power supply is automatically selected with the maximum voltage value.
* These Nano ATmega168 have PinOut for V3, not V2.
Technical details:
Nano V3 form factor,
ATmega168 (16Mhz) microcontroller,
CH340G-USB-UART interface,
Input voltage 6-12V,
Output voltage 5V/800mA, 3.3V/180mA (Only in NEW vesrion),
MicroUSB connection,
500mA resetable Fuse on USB port