A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
HDC3021 ACTIVE 0.5% RH digital humidity sensor with removable tape cover Improved accuracy (±0.5 %RH), smaller QFN package with removable tape for conformal coating
HDC3021-Q1 ACTIVE Automotive 0.5% RH digital humidity sensor with removable tape cover Automotive (Q100) qualified, higher accuracy (±0.5 %RH) in QFN package (2.5 mm × 2.5 mm)

Product details

Relative humidity accuracy (typ) (%RH) 2 Temperature accuracy (typ) (°C) 0.2 Relative humidity operating range (typ) (%RH) 0 to 100 Supply voltage (min) (V) 1.62 Supply voltage (max) (V) 3.6 Operating temperature range (°C) -40 to 125 Interface type I2C Rating Catalog
Relative humidity accuracy (typ) (%RH) 2 Temperature accuracy (typ) (°C) 0.2 Relative humidity operating range (typ) (%RH) 0 to 100 Supply voltage (min) (V) 1.62 Supply voltage (max) (V) 3.6 Operating temperature range (°C) -40 to 125 Interface type I2C Rating Catalog
WSON (DEB) 6 9 mm² 3 x 3
  • 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

  • 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

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.

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.

Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
HDC2022 ACTIVE 2% RH ultra-low-power digital relative humidity sensor, IP67 filter Pin and software compatible, with permanent IP67 filter
HDC2080 ACTIVE 2% RH ultra-low-power digital relative humidity sensor, interrupt/DRDY Pin and software compatible, without removable tape
Same functionality with different pin-out to the compared device
HDC2010 ACTIVE 2% RH ultra-small, low-power digital relative humidity sensor Software compatible in QFN package (3.0 mm × 3.0 mm)

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 11
Type Title Date
* Data sheet HDC2021 High-Accuracy, Low-Power Humidity and Temperature Sensor datasheet (Rev. A) 26 Jun 2020
* User guide HDC20XX Silicon User's Guide PDF | HTML 30 Nov 2020
Application brief Using RH to Derive Vapor Pressure, Dew Point, Absolute Humidity, and Enthalpy PDF | HTML 09 Feb 2023
White paper 85°C/85% RH Accelerated Life Test Impact on Humidity Sensors (Rev. A) PDF | HTML 07 Sep 2021
Technical article Why long-term consistent performance matters for relative humidity sensors PDF | HTML 21 Jun 2021
Application note Is a Protective Cover Needed for Humidity Sensors? PDF | HTML 21 Apr 2021
Technical article How accurate sensing in HVAC systems improves efficiency and saves consumers money PDF | HTML 26 Jan 2021
Technical article Interface to sensors in seconds with ASC Studio PDF | HTML 12 Nov 2020
Application note Programming the HDC20X0 Devices 29 Aug 2018
Application note Humidity Sensor: Storage and Handling Guidelines 28 Aug 2017
Application note Optimizing Placement and Routing for Humidity Sensors (Rev. A) 06 Mar 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

HDC2080EVM — HDC2080 Low Power Humidity and Temperature Sensor Evaluation Module

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 (...)
User guide: PDF
Not available on TI.com
Package Pins CAD symbols, footprints & 3D models
WSON (DEB) 6 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos