GY-21 Humidity Sensor With I2C Interface Si7021

GY-21 Humidity Sensor With I2C Interface Si7021

Humidity Sensor with I2C IIC Interface Si7021 Industrial High Precision GY-21 Temperature Sensor Module Low Power CMOS 3-5V

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Humidity Sensor with I2C IIC Interface Si7021 Industrial High Precision GY-21 Temperature Sensor Module Low Power CMOS 3-5V


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.



  • Supply Power 3-5v

  • 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 μA 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





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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