blankPressure Sensors
blankMeasuring Cells
aktivHumidity Sensors
blankTemperature Sensors
blankMagneto Sensors



PHTU21D Digital Humidity/Temperature Sensor On PCB



The new digital sensor PHTU21D consists of a fully self contained capacitive humidity sensor combined with a bandgap temperature sensor (HTU21-D) mounted on a printed circuit board. Every product is individually calibrated, compensated and finally tested. The PHTU21D sensors are dedicated humidity and temperature plug and play sensors for OEM applications where reliable and accurate measurements are needed. PHTU21D sensors are characterized by a 0 – 100% RH-range and by an extended temperature range. The humidity and tempera­ture digital outputs are in an I²C format and suitable for all micro-controllers. The resolution of PHTU21D sensor can be changed by command (8/12bit up to 12/14bit for RH/T), whereby the measurement time and the current consumption can be modified. With the very low power consumption the sensors are dedicated for battery powered applications. Furthermore, low battery can be detected and a checksum improves communication reliability.

Humidity and temperature response time as well as the recovering time (from condensing humidity) are in the range of a few seconds.

Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out by command.

  • Wide humidity range 0-100%RH
  • Wide temperature range -40-125°C
  • Digital I²C- interface
  • Humidity accuracy ±2%RH typical
  • 1.5 - 3.6Volt operation
  • Low power dissipation typ. 2.7μW
  • Instantaneous desaturation after long periods in saturation phase
  • Compatible with automatized assembly (reflow) processes,
  • Electronical identification code
  • Small dimensions (DFN-package)
  • Adjustable resolution
  • RoHS suitable and Pb free
  • Automotive (passenger compartment)
  • Home Appliances
  • Medical Equipment
  • Printers and copiers
  • Humidifiers and HVAC systems
  • Building Automation
  • Weather monitoring
  • Security systems
  • Multi media - smart phone, tablet


For information according to prices, delivery dates and sample ordering or for technical questions please contact

Amsys reserves the right for changes concerning dimensions, technical data and other details without previous announcement.