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The HTU21D(F) is a digital humidity and temperature sensor for OEM applications. Setting the standard in terms of size and intelligence, it is embedded in a reflow solderable Dual Flat No leads (DFN) package with a small 3 x 3 x 0.9 mm footprint. This sensor provides calibrated, linearized signals in digital, I²C format. HTU21D(F) digital humidity sensors are dedicated humidity and temperature plug and play transducers for OEM applications where reliable and accurate measurements are needed. Direct interface with a micro-controller is made possible with the module for humidity and temperature digital outputs. These low power sensors are designed for high volume and cost sensitive applications with tight space constraints. Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out by command. Low battery can be detected and a checksum improves communication reliability. The resolution of these digital humidity sensors can be changed by command (8/12bit up to 12/14bit for RH/T).


  • DFN type package
  • Relative Humidity and Temperature Digital Output, I²C interface 
  • Fully calibrated 
  • Lead free sensor, reflow solderable
  • Low power consumption 
  • Fast response time 
  • Full interchangeability with no calibration required in standard conditions 
  • Instantaneous desaturation after long periods in saturation phase 
  • Compatible with automatized assembly processes, including Pb free and reflow processes
  • Individual marking for compliance to stringent traceability requirements 


  • Home Appliance
  • Medical
  • Printers
  • Humidifier
  1. HTU21 Humidity Temperature Sensor (English)

Learn how the HTU21 Humidity Temperature Sensors maintain constant conditions to increase efficiency and reduce waste in appliances like refrigerators.


The HTU21D Click (MIKROE-1687)  from Mikroe™ features the HTU21D and the Temp&Hum 13 Click (MIKROE-3635)  features the HTU21DF. These development boards allow customers to evaluate the sensor and create reference designs easily. Click boards are plug-and-play modules designed to add extra functionality to existing development kits. These small, function-specific add-on modules all have a common interface to the mikroBUS™ adapter board. Reference design examples are provided to get the user started quickly.


Please review product documents or contact us for the latest agency approval information.  

Product Type Features

  • Humidity Sensor Component Product Type  RHT

  • Humidity Sensor Component Sensor Type  Digital

Electrical Characteristics

  • Supply Voltage (Peak) (V) 3.8

  • Current Consumption (mA) .014

Usage Conditions

  • Humidity Operating Range (%RH) 0 – 100

  • Operating Temperature Range  -40 – 125 °C [ -40 – 257 °F ]

Reference Number

  • TE Internal Number CAT-HSC0004

Related Materials

CAD Files

Datasheets & Catalog Pages

Mikroe and Click Board are trademarks of MikroElektronika DOO.