With the new SHT21, Sensirion (Switzerland) launches the world’s smallest digital humidity and temperature sensor. The SHT21 consists of a newly designed, sophisticated sensor chip encapsulated in a 3x3x1.1-mm DFN 3-0 package. Over-molding provides excellent protection against aging and ambient impact, such as condensation and harsh environments, and thus yields outstanding long-term stability.
The SHT21 is fully calibrated and provides an I2C digital interface. Analog output modes (such as PWM) are available on request. The digital communication mode enables superb low power consumption: A value in the range of 3μW at normal operation is well achieved. Typical sensor accuracy is ±2% RH over 20–80% RH and ±0.3 °C over 25–42 °C. Provided on tape & reel, the reflow solderable SHT21 is suitable for high volume applications. Furthermore, the sensor is qualified in accordance with automotive standard AEC-Q100 and an extended quality assurance program guarantees low PPM values.