Get to know the world’s smallest digital humidity and temperature sensor!  

Sensirion’s digital humidity and temperature sensors of the SHT2x series consist of a newly designed, high-performance sensor chip encapsulated in a DFN 3-0 package. With this encapsulation the chip is completely over-molded, except the humidity sensing area. In this way, the components size is reduced to a 3x3-mm footprint with 1.1-mm height. Additionally, over-molding provides excellent protection against aging and ambient impact, such as condensation and harsh environments, and thus yields outstanding long-term stability.

The fully calibrated state of the sensor and its true I2C digital interface ensure an easy application. 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 and it may be lowered further by increasing the measurement interval.

The typical sensor accuracy of the standard version SHT21 is ±2% RH over 20–80% RH and ±0.3 °C over 5–60 °C. The recently launched high-precision version SHT25 achieves a typical accuracy of 1.8% RH (at 25°C) for relative humidity and 0.2°C for temperature. For both quantities, the typical tolerance is small even at the limits of the measuring range.

Both versions have been qualified in accordance with automotive standard AEC-Q100. Furthermore, an extended quality assurance program guarantees low PPM values. A scan path routine enables detailed sensor quality checking, while individual detailed tracking information on the chip can be read out by a simple command. Additionally, the SHT2x is reflow solderable without any degradation of sensor performance. The sensor is provided on tape & reel to enable standard, trouble-free handling. That all makes the SHT21 the perfect choice for high-volume applications.

Get to know the high performance of the world’s smallest digital humidity and temperature sensor and order your personal sample of the SHT21 at www.sensirion.com/mysht21!