2% RH ultra-low-power digital relative humidity sensor, tape cover


Product details


Relative humidity accuracy (Typ) (%RH) ±2 Temperature accuracy (Typ) (°C) ±0.2 Relative humidity operating range (Typ) (%RH) 0 - 100 Supply voltage (Min) 1.62 Supply voltage (Max) 3.6 Average supply current (Typ) (uA) 0.55 @ 1 sample / sec Operating temperature range (C) -40 to 125 Interface type I2C Package type Tape cover Rating Catalog open-in-new Find other Humidity sensors


  • Factory-installed polyimide tape to protect sensor during assembly
  • RH measurement range: 0% to 100%
  • Temperature measurement range: –40°C to 125°C
  • Humidity accuracy: ±2% (typical), ±3% (maximum)

  • Temperature accuracy: ±0.2°C (typical), ±0.4°C (maximum)

  • Supply voltage range: 1.62 V to 3.6 V
  • I2C interface compatibility
  • 50 nA sleep mode current
  • 550 nA average supply current (11-bit accuracy option, 1 measurement/second)
  • Continuous conversion or one-shot measurement mode

  • Backward-compatible with HDC2080

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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 tweezers.

The 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 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 is designed for ultra-low power battery-operated systems.

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Technical documentation

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Type Title Date
* Data sheet HDC2021 High-Accuracy, Low-Power Humidity and Temperature Sensor datasheet (Rev. A) Jun. 26, 2020
* User guide HDC20XX Silicon User's Guide Nov. 30, 2020
White paper 85°C/85% RH Accelerated Life Test Impact on Humidity Sensors (Rev. A) Sep. 07, 2021
Technical article Why long-term consistent performance matters for relative humidity sensors Jun. 21, 2021
Application note Is a Protective Cover Needed for Humidity Sensors? Apr. 21, 2021
Technical article How accurate sensing in HVAC systems improves efficiency and saves consumers money Jan. 26, 2021
Technical article Interface to sensors in seconds with ASC Studio Nov. 12, 2020
Technical article Understanding tamper detection sensors Nov. 18, 2019
Application note Programming the HDC20X0 Devices Aug. 29, 2018
Application note Humidity Sensor: Storage and Handling Guidelines Aug. 28, 2017
Application note Optimizing Placement and Routing for Humidity Sensors (Rev. A) Mar. 06, 2017

Design & development

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Hardware development

document-generic User guide
The HDC2080EVM (evaluation module) is an easy to use, plug-and-play, platform for evaluating the functionality and performance of the HDC2080 humidity and temperature sensor.  The EVM utilizes a USB interface with MSP430F5528 microcontroller to establish communication between the HDC2080 device (...)
  • Streaming relative humidity and temperature measurements
  • Data logging
  • Full register access
  • USB plug & play
  • Detachable sensor section for prototype remote operation

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