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The HTS221 is an ultra-compact sensor for relative humidity and temperature. It includes a sensing element and a mixed signal ASIC to provide the measurement information through digital serial interfaces.
The sensing element consists of a polymer dielectric planar capacitor structure capable of detecting relative humidity variations and is manufactured using a dedicated ST process.
The HTS221 is available in a small top-holed cap land grid array (HLGA) package guaranteed to operate over a temperature range from -40 °C to +120 °C.Key Features
- 0 to 100% relative humidity range
- Supply voltage: 1.7 to 3.6 V
- Low power consumption: 2 μA @ 1 Hz ODR
- Selectable ODR from 1 Hz to 12.5 Hz
- High rH sensitivity: 0.004% rH/LSB
- Humidity accuracy: ± 3.5% rH, 20 to +80% rH
- Temperature accuracy: ± 0.5 °C,15 to +40 °C
- Embedded 16-bit ADC
- 16-bit humidity and temperature output data
- SPI and I²C interfaces
- Factory calibrated
- Tiny 2 x 2 x 0.9 mm package
- ECOPACK® compliant
Featured Videos
This video on the SensorTile.box Pro Mode shows you how to use this IoT and wearable sensor development kit to create customized wireless applications using an STM32Cube function pack. Use-case on a Human Activity Recognition algorithm included.
Watch this short tutorial on the Expert mode of the SensorTile.box to learn how to use a graphical wizard to build programs without having to write any code.
The first video in the SensorTile.box series of short tutorials will guide you through the pre-recorded examples in the device firmware to help you use IoT and wearable sensor applications.
Ecosystems
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Picture Part number Manufacturer Description AWS IoT Core AWS AWS IoT Core is a managed cloud service that lets connected devices easily and securely interact with cloud applications and other devices AZURE Cloud Microsoft Microsoft Azure is an ever-expanding set of cloud services to help your organization meet your business challenges. It's the freedom to build, manage, and deploy applications on a massive, global network using your favorite tools and frameworks. Watson IoT Platform IBM IBM Watson IoT Platform is a managed, cloud-hosted service designed to make it simple to derive value from your Internet of Things devices. Part NumberAWS IoT Core is a managed cloud service that lets connected devices easily and securely interact with cloud applications and other devices
Microsoft Azure is an ever-expanding set of cloud services to help your organization meet your business challenges. It's the freedom to build, manage, and deploy applications on a massive, global network using your favorite tools and frameworks.
IBM Watson IoT Platform is a managed, cloud-hosted service designed to make it simple to derive value from your Internet of Things devices.
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Picture Part number Manufacturer Description SensiBLE SensiEDGE Ready-to-use BLE System-on-Module packed with sensors, low power ARM® 32-bit Cortex®-M4 CPU and coin battery. Speed up IoT product development today! SensiBLE 2.0 SensiEDGE SensiBLE 2.0 SoM integrates a rechargeable Li-Ion battery, a variety of sensors, and a low power Cortex M0 core that executes Bluetooth protocols. 
SensiBLE 2.1 SensiEDGE SensiBLE 2.1 SoM integrates a rechargeable Li-Ion battery, a variety of sensors, and a low power Cortex M0 core that executes Bluetooth protocols. SensiSUB SensiEDGE Connecting low-power SUB 1GHZ RF transceiver to the Cloud with fully customisable sensors, ARM® 32-bit Cortex®-M4 CPU and coin battery. Temp&Hum click MikroElektronika Temp&Hum click carries ST's HTS221 temperature and relative humidity sensor. Its temperature measurement accuracy is ±1°C within a 0-60°C range. Part NumberReady-to-use BLE System-on-Module packed with sensors, low power ARM® 32-bit Cortex®-M4 CPU and coin battery. Speed up IoT product development today!
SensiBLE 2.0 SoM integrates a rechargeable Li-Ion battery, a variety of sensors, and a low power Cortex M0 core that executes Bluetooth protocols.
SensiBLE 2.1 SoM integrates a rechargeable Li-Ion battery, a variety of sensors, and a low power Cortex M0 core that executes Bluetooth protocols.
Connecting low-power SUB 1GHZ RF transceiver to the Cloud with fully customisable sensors, ARM® 32-bit Cortex®-M4 CPU and coin battery.
Temp&Hum click carries ST's HTS221 temperature and relative humidity sensor. Its temperature measurement accuracy is ±1°C within a 0-60°C range.
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Picture Part number Manufacturer Description 
X-NUCLEO-IKS01A1 ST Motion MEMS and environmental sensor expansion board for STM32 Nucleo 
X-NUCLEO-IKS01A2 ST Motion MEMS and environmental sensor expansion board for STM32 Nucleo 
X-NUCLEO-IKS01A3 ST Motion MEMS and environmental sensor expansion board for STM32 Nucleo Part NumberMotion MEMS and environmental sensor expansion board for STM32 Nucleo
Motion MEMS and environmental sensor expansion board for STM32 Nucleo
Motion MEMS and environmental sensor expansion board for STM32 Nucleo
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Embedded Software
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Picture Part number Manufacturer Description 
X-CUBE-MEMS-XT1 ST Sensor and DSP algorithm software expansion for STM32Cube 
X-CUBE-MEMS1 ST Sensor and motion algorithm software expansion for STM32Cube Part NumberSensor and DSP algorithm software expansion for STM32Cube
Sensor and motion algorithm software expansion for STM32Cube
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Picture Part number Manufacturer Description AndroidHAL-IIO ST Android sensor HAL for MEMS motion and environmental sensors (Industrial I/O framework) AndroidHALInput ST Android sensor HAL for MEMS motion and environmental sensors (Input framework) C-Driver-MEMS ST Standard C platform-independent drivers for MEMS motion and environmental sensors LinuxDriverIIO ST Linux device drivers for MEMS motion and environmental sensors (Industrial I/O framework) LinuxDriverInput ST Linux device drivers for MEMS motion and environmental sensors (Input framework) Part NumberAndroid sensor HAL for MEMS motion and environmental sensors (Industrial I/O framework)
Android sensor HAL for MEMS motion and environmental sensors (Input framework)
Standard C platform-independent drivers for MEMS motion and environmental sensors
Linux device drivers for MEMS motion and environmental sensors (Industrial I/O framework)
Linux device drivers for MEMS motion and environmental sensors (Input framework)
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-MKI141V2 ST HTS221 humidity sensor adapter board for standard DIL24 socket (full pinout) 
STEVAL-MKSBOX1V1 ST SensorTile.box wireless multi sensor development kit with user friendly app for IoT and wearable sensor applications 
STEVAL-SMARTAG1 ST NFC Dynamic Tag sensor node evaluation board 
STREF-MKI128V6 ST Smart MEMS Multi-sensor module Part NumberHTS221 humidity sensor adapter board for standard DIL24 socket (full pinout)
SensorTile.box wireless multi sensor development kit with user friendly app for IoT and wearable sensor applications
NFC Dynamic Tag sensor node evaluation board
Smart MEMS Multi-sensor module
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Picture Part number Manufacturer Description 
STEVAL-BCN002V1B ST BlueTile - Bluetooth LE enabled sensor node development kit 
STEVAL-BFA001V1B ST Predictive maintenance kit with sensors and IO-Link capability 
STEVAL-IDI001V1 ST A premium developer's tool for sensor hub applications 
STEVAL-MKI187V1 ST ArgonKey mezzanine board based on different ST sensors Part NumberBlueTile - Bluetooth LE enabled sensor node development kit
Predictive maintenance kit with sensors and IO-Link capability
A premium developer's tool for sensor hub applications
ArgonKey mezzanine board based on different ST sensors
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Support and Applications
Quality and Reliability
| Part Number | Marketing Status | Package | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|
| HTS221TR | Active | HLGA-6L 2X2X0.9 | Ecopack2 | |
HTS221TR
Package:
HLGA-6L 2X2X0.9Material Declaration**:
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Marketing Status | Package | Packing Type | Temperature (°C) | ECCN (US) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | ||||||||||
| HTS221TR | 4 distributors | Active | HLGA-6L 2X2X0.9 | Tape And Reel | -40 | 120 | EAR99 | MALTA | 1.4 / 1k | ||
HTS221TR
Marketing Status
ActiveUnit Price (US$)
1.4Budgetary Price (US$)*/Qty
1.4 / 1k(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
