Sensirion AG

SHT21 Humidity Sensor – AEC-Q100 reliability confirmed again

Sensirion’s new SHT21 humidity and temperature sensor has now been qualified in accordance with the AEC-Q100 automotive standard. This confirms the outstanding reliabil-ity, stability and robustness of the sensor, which has been in regular production since April 2010. Successful AEC-Q100 qualification is remarkable in the sense that humidity sen-sors, unlike fully encapsulated electronic components, are constantly exposed to their surroundings and sensitive to ambient conditions.

During the qualification process, the SHT21 was put through the series of tests specified by AEC-Q100. In the High Tem-perature Operating Lifetime (HTOL) test, the sensor was operated at 125°C for 1000 hours to test its aging characteristics. The 96-hour Unbiased Highly Accelerated Stress Test (UHST) at 130°C and 85% relative humidity confirmed the sensor’s stress resistance. Furthermore, the package was tested in the Temperature Cycling (TC) test with 1000 cycles between
-50°C and +150°C, which measures the compatibility of the packaging material with the chip and the substrate. The series concluded with the Electrostatic Discharge (ESD) and Electromagnetic Compatibility (EMC) tests, which indicate the robust-ness of the sensor with regard to these two parameters.

The SHT21 humidity sensor passed all of the tests without any permanent changes to its characteristics and continued to generate in-tolerance readings. This means that Sensirion’s new SHT21, like the previous SHT1x generation of humidity sensors, meets the quality requirements of the AEC-Q100 automotive standard. This qualification, along with the reliability, stability and robustness it certifies, allows users to employ the SHT21 in their applications with confidence and the assurance of proper, trouble-free operation.

Link SHT21 site: www.sensirion.com/humidity-sensor-sht21
Link SHT21 datasheet: http://www.sensirion.com/humidity-sensor-sht21-datasheet;
Link SHT21 free sampling promotion: www.sensirion.com/mysht21