humidity sensor PHTU21D on PCB by AMSYS

humidity sensor PHTU21D on PCB for quick and easy use

The digital PHTU21D consists of an OEM humidity and temperature sensor (HTU21D) mounted on a circuit board with four pin connectors. Each sensor is individually calibrated, compensated for and tested.

This enables humidity to be measured within a range of 0 to 100% RH. The sensor is designed for an extended temperature range of -40 to +125°C which can be measured with great accuracy thanks to the integrated temperature sensor.
The outputs for humidity and temperature in I²C format are suitable for further data processing using simple, inexpensive microcontrollers. The resolution of the HTU21D can be programmed (8/12 bits to 12/14 bits RH/T). As the sensor has a low power consumption it is suitable for battery operation. For such applications the current battery level can be displayed for monitoring purposes.

Secure data transmission is ensured by a CRC or cyclic redundancy check. Humidity and temperature signal response times and the recovery time (following full saturation) are within a range of a few seconds. The special electrical ID code can be read out by an I²C bus besides the printed code, making the device fully trackable.


  • Humidity range of 0 to 100% RH
  • Temperature range of -40 to +125°C
  • Digital I²C interface
  • Accuracy of ±2% RH
  • Supply voltage of 1.5 to 3.6 V
  • Short signal times
  • Settable resolution
  • Fast recovery time after saturation
  • Electrical ID code
  • Low power dissipation of 2.7 μW
  • Small DFN package
  • RoHS and REACH compliant


  • Car cabins
  • Household appliances
  • Medical equipment
  • Printers and copiers
  • Humidifiers/dehydrators and driers
  • Building facilities
  • Weather stations
  • Security systems
  • Multimedia devices (smartphones, tablets)


For information on prices and delivery times or if you have any technical questions, please contact