The TMP102 is a two-wire, serial output temperature sensor available in a tiny SOT563 package. Requiring no external components, the TMP102 is capable of reading temperatures to a resolution of 0.0625°C.
The TMP102 features SMBus and two-wire interface compatibility, and allows up to four devices on one bus. It also features an SMB alert function.
The TMP102 is ideal for extended temperature measurement in a variety of communication, computer, consumer, environmental, industrial, and instrumentation applications. The device is specified for operation over a temperature range of –40°C to +125°C.
Note that the TMP102 is a 3.3V device and will require a Logic Level Converter to connect it to a 5V Arduino.
Data sheet: File:TMP102.pdf