Cost Optimised Digital Humidity and Temperature Sensing Element


The HTE301 is the next generation of the digital RH/T series HTEx01. The sensor provides an accuracy of up to 1.8 %RH incl. hysteresis, a constant current heater and integrated sensor coating. With a 16-bit unsigned integer value and a different pin assignment compared to HTE501, the HTE301 allows an easy upgrade for your existing application with minimal integration effort.

HTE301 – Humidity and temperature sensing element

Highly accurate measurement, broad range of applications
The stated accuracy of the relative humidity measurement up to ±1.8 % (incl. hysteresis). Integrated hysteresis compensation ensures that the sensing element always keeps within its tolerance window, even when the humidity content rises or falls. With a temperature range of -40 °C to 125 °C, the HTE301 sensing element is suitable for a wide range of applications.

Suitable for demanding operating conditions
The active sensor surface is permanently protected against dirt and corrosive deposits by the proprietary E+E sensor coating. This special protective coating ensures excellent measurement performance and long-term stability even under demanding conditions. The sensing element can therefore be used in harsh environments without the need for additional protection.

The integrated constant current heater, which can be activated as required, keeps the sensing element at an excess temperature and thus prevents condensation and deposits caused by condensation.

Measured value output via I²C interface
The measured value output is based on the I²C data communication protocol. The measured values are available in 16 bit unsigned integer format. 4 individually adjustable I²C addresses make it possible to operate several sensing elements on one I²C bus.

Simple design-in and evaluation kit
The DFN enclosure of the HTE301 measures only 2.5 x 2.5 x 0.9 mm. This makes the sensing element suitable for demanding designs and tight spaces.

  HTE301 HTE501
Measurements Humidity, Temperature Humidity, Dew Point, Temperature
Humidity range 0…100 % 0…100 %
Accuracy humidity up to 1.8 % RH up to 1.8 % RH
Integrated humidity hysteresis compensation yes yes
Response time humidity (typ. τ63% ) 5 s 5 s
Temperature range -40…125 °C -40…135 °C
Accuracy temperature up to 0.2 °C up to 0.2 °C
Response time temperature (min. τ63%) 2 s 2 s
E+E proprietary coating yes yes
Heater up to 16 mW up to 288 mW
Direct Dewpoint output yes
Alert output yes
Reset Pin yes
Supply Voltage 2.35 – 3.6 V 2.35 – 3.6 V
Interface I²C, 16 bit  unsigned integer I²C, 16 bit signed integer 
I²C pin selectable adresses up to 4 up to 8
I²C Pull-up resistors (integrated) yes
Measurement mode Single shot (low power), periodic Single shot (low power), periodic
Housing 8-pin DFN package 8-pin DFN package
Dimensions (L x W x H) 2.5 x 2.5 x 0.9 mm 2.5 x 2.5 x 0.9 mm
Packaging size (T&R) 2,500 pcs.  2,500 pcs. 

Typical Applications

  • Building automation
  • Consumer electronics
  • Home appliances
  • Industrial automation
  • Medical devices
  • Smart home
  • Wearable devices
  • White goods

Key Features

  • Outstanding measurement accuracy
  • E+E proprietary coating
  • Constant current heater
  • I²C interface with 16 bit unsigned integer output
  • 8-pin DFN package
  • I²C interface with pin-selectable addresses
  • Excellent repeatability

Technical Data

Measuring range
0...100 % RH
-40...125 °C (-40...257 °F)
up to ±1.8 % RH (incl. hysteresis)
up to ± 0.2 °C (0.36 °F)
Digital interface
2.35 - 3.6 V

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