Possibly the smallest 12 pin micro-controller currently available?
- 1.5 x 1.4 x .5 mm 🙂 2KB 12Mhz 10 IO pins
- .4mm pin pitch
- Possible to route 8 of the IO using .127mm (5mil) traces and clearance
- You loose one internal pad due to trace width, and another external pad because one of the internal pads is GND which is necessary.
Digikey currently sells it for $1.1 at 100 qty: http://www.digikey.com/
Compared to a 32Pin QFN package:
Compared to various other Atmel MCUs