HDC2021 Low-power humidity and temperature digital sensor with protective cover | TI.com

This product is prototype/experimental and has not been released to the market. Testing and final processes may not be complete. This product may be subject to further changes or possible discontinuation.
Low-power humidity and temperature digital sensor with protective cover


Sample Availability

Prototype samples are available (PHDC2021DEBT). Request Now


The HDC2021 is an integrated relative humidity and temperature sensor with a factory-installed polyimide tape cover over the opening of the relative humidity sensor element. The tape cover provides protection against pollutants that can appear in certain stages of the manufacturing process, such as SMT assembly, PCB board wash, and conformal coating. The tape design allows for a full conformal coating of the PCB, and includes an adhesive free corner tab for quick removal using a pair of tweezers.

The HDC2021 device is backward-compatible with the HDC2080, providing high accuracy measurements with very low power consumption in a small DFN package. The capacitive-based sensor includes new integrated digital features and a heating element to dissipate condensation and moisture. The HDC2021 digital features include programmable interrupt thresholds to provide alerts and system wake-ups without requiring a microcontroller to continuously monitor the system. Combined with programmable sampling intervals, low power consumption, and 1.8-V supply voltage support, the HDC2021 is designed for ultra-low power battery-operated systems.

The HDC2021 provides high-accuracy measurement capability for a wide range of environmental monitoring and Internet of Things (IoT) applications such as smart thermostats and smart home assistants.

For applications with strict power-budget restrictions, Auto Measurement Mode enables the HDC2021 to automatically initiate temperature and humidity measurements. This feature allows users to configure a microcontroller into deep sleep mode because the HDC2021 is no longer dependent upon the microcontroller to initiate a measurement.

Programable temperature and humidity thresholds in the HDC2021 allow the device to send a hardware interrupt to wake up the microcontroller when necessary. In addition, the power consumption of the HDC2021 is significantly reduced, which can help minimize self-heating and improve measurement accuracy.

The HDC2021 is factory-calibrated to ±0.2°C temperature accuracy and ±2% relative humidity accuracy.


  • Factory-installed polyimide tape to protect sensor during assembly
  • Backward-compatible with HDC2080
  • RH measurement range: 0% to 100%
  • Temperature measurement range: –40°C to 125°C
  • Supply voltage range: 1.62 V to 3.6 V
  • I2C interface compatibility
  • ±2% RH sensor accuracy
  • ±0.2°C temperature sensor accuracy
  • 50-nA sleep mode current
  • 550-nA average supply current (11-bit, 1 measurement/second)
  • Available auto measurement mode

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Part number Order Relative humidity accuracy (Typ) (%RH) Temperature accuracy (Typ) (°C) Relative humidity operating range (Typ) (%RH) Interface Supply voltage (Min) Supply voltage (Max) Average supply current (Typ) (uA) Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Rating
HDC2021 Order now ±2     ±0.2     0 - 100     Digital     1.62     3.6     0.55 @ 1 sample / sec     -40 to 125     WSON | 6     6WSON: 9 mm2: 3 x 3 (WSON | 6)     Catalog    
HDC2010 Order now ±2     ±0.2     0 - 100     Digital     1.62     3.6     0.55 @ 1 sample/sec     -40 to 85         Catalog    
HDC2080 Order now ±2     ±0.2     0 - 100     Digital     1.62     3.6     0.55 @ 1 sample / sec     -40 to 85     WSON | 6     6WSON: 9 mm2: 3 x 3 (WSON | 6)     Catalog