Humidity Sensing Elements

HYT 271 Digital Humidity Element With I2C Interface

The HYT 271 combines the advantages of a precise, capacitive humidity sensor with the high functionality of an ASIC. Integrated signal processing provides relative humidity and temperature over the I2C compatible interface as digital values. The module is factory calibrated and any further alignment by the user is not necessary.  Both linearity and temperature drift are corrected by on chip calibration, providing excellent accuracy over a wide range of temperature and humidity.

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HYT 271 has excellent chemical resistance and long term stability, even in areas of high humidity. The sensor is dew resistant. Plug-in type SIL connections with an SMD version available upon request.  Evaluation kits are also available.


  • Measurement range of 0 to 100% rH, -40 to 125C
  • Accuracy ±1.8% rH and ±0.2C (HYT 271-H)
  • I2C interface - communicate with 126 sensors at one time
  • Chemical resistant, dew formation resistant
  • Low operating voltage of 2.7 to 5.5V
  • Miniature construction
  • Optimum price-to-performance ratio
  • RoHS conformance

Technical Features

Measuring Principle: Capacitive polymer humidity sensor
Humidity Range: 0-100% relative humidity
Max. Dew Point: +80°C
Humidity Accuracy:

HYT 271 ±1.8% rH

Humidity Resolution: 0.02% rH
Temperature Measurement Range: -40 to +120°C
Temperature Accuracy: HYT 271 ±0.2°C
Temperature Resolution 0.01°C
Hysteresis: less than ±1% rh
Response Time: less than 4 sec
Digital Interface: I2C, Address0x28 Alternative address
Operating Voltage: 2.7 to 5.5V (optional 1.8 to 3.6V)
Dimensions: 5.08 X 10.16 X 2.0 mm
Connection: SIL RM 1.27 mm
Meets RoHS conformity: Yes


  • HVAC
  • Automotive
  • Consumer products
  • Household appliances
  • Instrumentation