High-accuracy, low-power, humidity and temperature digital sensor with drift correction


Product details


Relative humidity accuracy (Typ) (%RH) 1.5 Temperature accuracy (Typ) (°C) 0.1 Relative humidity operating range (Typ) (%RH) 10 to 90 Supply voltage (Min) 1.62 Supply voltage (Max) 5.5 Average supply current (Typ) (uA) 0.9 Operating temperature range (C) -40 to 125 Interface type I2C Package type Filter cover, Open cavity, Tape cover Rating Catalog open-in-new Find other Humidity sensors


  • Relative humidity (RH) sensor:
    • Operating range: 0% to 100%
    • Accuracy: ±1.5% typical
    • Drift Correction: reduces offset to return device to within accuracy specification
    • Long-term drift: 0.21%RH/yr
    • Condensation protection with integrated heater
  • Temperature sensor:
    • Operating range: -40°C to 125°C
    • Accuracy: ±0.1°C typical
  • NIST traceability: Relative humidity & temperature
  • Low power: average current 0.7 µA
  • I2C interface compatibility up to 1-Mhz speeds
    • Four selectable I2C addresses
    • Command/data protection through CRC checksum
  • Supply voltage: 1.62 V to 5.50 V
  • Available auto measurement mode
  • Programmable interrupts
  • Programmable measurement calibration
  • Factory-installed polyimide tape assembly cover
  • Factory-installed IP67 rated environmental cover
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The HDC302x is an integrated capacitive based relative humidity (RH) and temperature sensor, which provides high accuracy measurements over a wide supply range (1.62 V – 5.5 V), along with ultra-low power consumption in a compact 2.5-mm × 2.5-mm package. Both the temperature and humidity sensors are 100% tested and trimmed on a production setup that is NIST traceable and verified with equipment that is calibrated to ISO/IEC 17025 standards.

Drift Correction reduces RH sensor offset due to aging, exposure to extreme operating conditions, and contaminants to return device to within accuracy specifications. For battery IoT applications, auto measurement mode and ALERT feature enable low system power by maximizing MCU sleep time. There are four different I2C addresses that support speeds up to 1 MHz. A heating element is available to dissipate condensation and moisture.

The HDC3020 comes in an open cavity package without a protective cover. Two device variants have a cover option to protect the open cavity RH sensor: HDC3021 and HDC3022. HDC3021 has removable protective tape to allow conformal coatings and PCB wash. HDC3022 has a permanent IP67 filter membrane cover to protect against dust and water.

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Technical documentation

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Type Title Date
* Data sheet HDC302x High-Accuracy, Low-Power, Digital Humidity and Temperature Sensor With Ultra-Low Drift datasheet Jun. 14, 2021
* User guide HDC3020 Silicon User Guide Jun. 15, 2021
White paper 85°C/85% RH Accelerated Life Test Impact on Humidity Sensors (Rev. A) Sep. 07, 2021
Application note Leveraging Relative Humidity Sensor Enhanced Features for Ultra-Low-Power System (Rev. A) Sep. 01, 2021
Application note How the HDC3020 Humidity Sensor Family Achieves The Industry's Lowest Drift (Rev. A) Aug. 31, 2021
User guide HDC3020 EVM User's Guide (Rev. A) Jun. 25, 2021
Technical article Why long-term consistent performance matters for relative humidity sensors Jun. 21, 2021
Technical article Interface to sensors in seconds with ASC Studio Nov. 12, 2020
Technical article Understanding tamper detection sensors Nov. 18, 2019
Technical article 2-wire 4-20mA transmitters: Controlling 2-Wire Transmitter Outputs with Externally Powered Sources (Part 4) Feb. 24, 2015

Design & development

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Hardware development

document-generic User guide

The HDC3020EVM evaluation module (EVM) enables designers to evaluate the operation and performance of the HDC3020 relative humidity and temperature sensor. The EVM hosts an MSP430F5528 microcontroller (µC) as well as the HDC3020. The µC is used to control the HDC3020 and communicate with (...)

  • Streaming relative humidity and temperature measurements
  • Data logging
  • USB plug-and-play
  • Detachable sensor section for prototype remote operation

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