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SI7021 I2C Humidity Sensor

SI7021 I2C Humidity Sensor


100% brand new and high quality.

The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC integrating humidity and temperature sensor elements, an analog-to-digital
converter, signal processing, calibration data, and an I2C Interface. The patented use of industry-standard, low-K polymeric dielectrics for sensing humidity enables the construction of low-power, monolithic CMOS Sensor ICs with low drift and hysteresis, and excellent long term stability

The humidity and temperature sensors are factory-calibrated and the calibration data is stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no recalibration or software changes required.

The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can be used as a hardware- and software-compatible drop-in upgrade for existing RH/temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing over a wider range and lower power consumption. The optional factory-installed cover offers a low profile, convenient means of protecting the sensor during assembly (e.g., reflow soldering) and throughout the life of the product, excluding liquids (hydrophobic/oleophobic) and particulates.

The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal for measuring humidity, dew-point, and temperature, in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms

  • Precision Relative Humidity Sensor
  • ± 3% RH (max), 0-80% RH
  • High Accuracy Temperature Sensor
  • ±0.4 °C (max), -10 to 85 °C
  • 0 to 100% RH operating range
  • Up to -40 to +125 °C operating range
  • Wide operating voltage (1.9 to 3.6 V)
  • Low Power Consumption 150 A active current
  • 60 nA standby current
  • Factory-calibrated
  • I2C Interface
  • Integrated on-chip heater
  • 3x3 mm DFN Package
  • Excellent long term stability
  • Optional factory-installed cover
  • Low-profile
  • Protection during reflow
  • Excludes liquids and particulates
  • Applications:
  • HVAC/R
  • Thermostats/humidistats
  • Respiratory therapy
  • White goods
  • Indoor weather stations
  • Micro-environments/data centers
  • Automotive climate control and defogging
  • Asset and goods tracking
  • Mobile phones and tablets
  • Size: 1.3*1cm/0.51*0.39"


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