Digital humidity sensor is 'world's smallest' claims Sensirion

The SHT21 consists of a sensor chip encapsulated in a 3 x 3x 1.1mm DFN 3-0 package. Over moulding is designed to provide protection against aging and ambient impact, such as condensation and harsh environments. The device is fully calibrated and provides an I²C digital interface, while the digital communication mode is said to enable low power consumption. According to Sensirion, a value in the range of 3µW at normal operation is well achieved. Typical sensor accuracy is ±2% RH over 20 to 80% RH and ±0.3^°C over 25 to 42^°C. Provided on tape & reel, the reflow solderable SHT21 is qualified in accordance with automotive standard AEC-Q100. Start of production is scheduled for April 2010.