Specifications
| Type | Description |
|---|---|
| Part Number | HDC3021 |
| Manufacturer | Texas Instruments |
| Product Type | Digital relative humidity and temperature sensor |
| Category | Sensors |
| Package / Case | WSON (8), 2.50 mm x 2.50 mm x 0.8 mm |
| Relative Humidity Operating Range | 0 to 100 %RH; Non-condensing |
| Relative Humidity Accuracy | ±0.5 %RH typ, ±2.0 %RH max; TA=25°C, 10% to 50% RH |
| Relative Humidity Accuracy | ±1.0 %RH typ, ±2.0 %RH max; TA=25°C, 0% to 70% RH |
| Relative Humidity Accuracy | ±1.0 %RH typ, ±2.5 %RH max; TA=25°C, 10% to 80% RH |
| Relative Humidity Accuracy | ±1.5 %RH typ, ±3.0 %RH max; TA=25°C, 10% to 90% RH |
| Relative Humidity Accuracy | ±1.5 %RH typ, ±3.5 %RH max; TA=25°C, 0% to 100% RH |
| Relative Humidity Repeatability | ±0.02 %RH typ; Low Power Mode 0, lowest noise |
| Relative Humidity Repeatability | ±0.02 %RH typ; Low Power Mode 1 |
| Relative Humidity Repeatability | ±0.03 %RH typ; Low Power Mode 2 |
| Relative Humidity Repeatability | ±0.04 %RH typ; Low Power Mode 3, lowest power |
| Relative Humidity Hysteresis | ±0.8 %RH typ; 10% to 90% RH |
| Relative Humidity Response Time | 4 s typ; 10% to 90% RH step, t63% |
| Relative Humidity Long-Term Drift | 0.19 %RH/yr typ |
| Relative Humidity Supply Sensitivity | -10 min, 1.8 typ, 10 max %RH/V; RH accuracy, VDD=1.8 V to 5.5 V |
| Temperature Sensor Operating Range | -40 to 125 °C; Operating free-air temperature |
| Relative Humidity Sensor Operating Free-Air Temperature | -20 to 80 °C; Recommended operating condition |
| Integrated Heater Operating Free-Air Temperature | -40 to 60 °C; For condensation removal |
| Temperature Accuracy | ±0.1 °C typ, ±0.2 °C max; 0°C ≤ TA ≤ 50°C |
| Temperature Accuracy | ±0.1 °C typ, ±0.3 °C max; -40°C ≤ TA ≤ 100°C |
| Temperature Accuracy | ±0.1 °C typ, ±0.4 °C max; -40°C ≤ TA < 125°C |
| Temperature Repeatability | ±0.04 °C typ; Low Power Mode 0, lowest noise |
| Temperature Repeatability | ±0.05 °C typ; Low Power Mode 1 |
| Temperature Repeatability | ±0.06 °C typ; Low Power Mode 2 |
| Temperature Repeatability | ±0.08 °C typ; Low Power Mode 3, lowest power |
| Temperature Response Time | 2 s typ; Stirred liquid, 25°C < TA < 75°C, t63% step, Rogers 4350B PCB 1.575 mm thickness |
| Temperature Long-Term Drift | ±0.03 °C/yr typ |
| Temperature Supply Sensitivity | -25 min, -5.7 typ, 25 max m°C/V; Temperature accuracy |
| Supply Voltage | 1.62 to 5.50 V; Recommended operating condition |
| Average Current | 0.4 µA; Low-power operation stated in features |
| Sleep Current | 0.4 µA typ; Trigger on demand |
| Sleep Current | 0.55 µA typ; Auto measure |
| Active Current | 99 µA typ; Device comparison table |
| Average IDD | 0.7 µA typ; Trigger on demand, 1 Hz |
| Average IDD | 0.9 µA typ; Auto measure, 1 Hz |
| Measurement Duration | 12.5 ms typ, 14.1 ms max; Low Power Mode 0, lowest noise |
| Measurement Duration | 7.5 ms typ, 8.4 ms max; Low Power Mode 1 |
| Measurement Duration | 5.0 ms typ, 5.7 ms max; Low Power Mode 2 |
| Measurement Duration | 3.7 ms typ, 4.2 ms max; Low Power Mode 3, lowest power |
| I2C Interface Speed | Up to 1 MHz; I2C-compatible interface |
| I2C Address Count | 4 selectable addresses; ADDR and ADDR1 pins configure 0x44, 0x45, 0x46, 0x47 |
| I2C Address 0x44 Configuration | ADDR1=GND, ADDR=GND; ADDR and ADDR1 cannot be left floating |
| I2C Address 0x45 Configuration | ADDR1=GND, ADDR=VDD; ADDR and ADDR1 cannot be left floating |
| I2C Address 0x46 Configuration | ADDR1=VDD, ADDR=GND; ADDR and ADDR1 cannot be left floating |
| I2C Address 0x47 Configuration | ADDR1=VDD, ADDR=VDD; ADDR and ADDR1 cannot be left floating |
| SCL/SDA Low-Level Input Voltage | 0.3 x VDD max; SCL, SDA pins |
| SCL/SDA High-Level Input Voltage | 0.7 x VDD min; SCL, SDA pins |
| VDD Absolute Maximum Voltage | -0.3 to 6.0 V; Applied voltage on VDD pin |
| SCL Absolute Maximum Voltage | -0.3 to 6.0 V; Applied voltage on SCL pin |
| SDA Absolute Maximum Voltage | -0.3 to 6.0 V; Applied voltage on SDA pin |
| ADDR Absolute Maximum Voltage | -0.3 to 6.0 V; Applied voltage on ADDR pin |
| ADDR1 Absolute Maximum Voltage | -0.3 to VDD + 0.3 V; Applied voltage on ADDR1 pin |
| ALERT Absolute Maximum Voltage | -0.3 to VDD + 0.3 V; Applied voltage on ALERT pin |
| RESET Absolute Maximum Voltage | -0.3 to VDD + 0.3 V; Applied voltage on RESET pin |
| Junction Temperature | -55 to 150 °C; Absolute maximum rating |
| Storage Temperature | -65 to 150 °C; Absolute maximum rating |
| ESD Human Body Model | ±2000 V; Per ANSI/ESDA/JEDEC JS-001 |
| ESD Charged Device Model | ±750 V; Per JEDEC JS-002 |
| Junction-to-Ambient Thermal Resistance | 84.9 °C/W; DEF, DEH, DEJ WSON 8-pin package |
| Junction-to-Board Thermal Resistance | 52.0 °C/W; DEF, DEH, DEJ WSON 8-pin package |
| Junction-to-Board Characterization Parameter | 51.7 °C/W; DEF, DEH, DEJ WSON 8-pin package |
| Junction-to-Case Bottom Thermal Resistance | 30.4 °C/W; DEF, DEH, DEJ WSON 8-pin package |
| Pin Count | 8 pins plus thermal pad; WSON package, thermal pad numbered 9 |
| SDA Pin Function | I2C serial data, open-drain, requires pullup resistor; Pin 1 |
| SCL Pin Function | I2C serial clock input; Pin 4 |
| ALERT Pin Function | Push-pull interrupt output; Pin 3; if unused, must be left floating |
| RESET Pin Function | Active-low reset input with internal pull-up to VDD; Pin 6; if unused, tie to VDD |
| HDC3021 Protective Option | Factory-installed removable protective tape; Allows conformal coatings and PCB wash |
| Integrated Heater | Available; Used to dissipate condensation and moisture |
| Data Protection | CRC checksum; I2C data protection feature |
| NIST Traceability | Relative humidity and temperature; Production setup NIST traceable and verified with ISO/IEC 17025 calibrated equipment |
| Datasheet Status | request_only |
Product Overview
The Texas Instruments HDC3021 is a digital relative humidity and temperature sensor for systems that need combined environmental measurement through an I2C-compatible interface. The device operates from a 1.62 to 5.50 V supply and supports I2C speeds up to 1 MHz, with four selectable addresses: 0x44, 0x45, 0x46, and 0x47 using ADDR and ADDR1 pin configurations.
Humidity measurement covers 0 to 100 %RH in non-condensing conditions, with listed 25°C accuracy grades across multiple RH spans. Temperature sensing covers -40 to 125 °C, while the relative humidity sensor recommended operating free-air temperature is -20 to 80 °C. The integrated heater is specified for -40 to 60 °C operation for condensation removal.
The HDC3021 is supplied in an 8-pin WSON package with a thermal pad numbered 9. Assembly-related features include factory-installed removable protective tape for conformal coatings and PCB wash. Pin functions include open-drain SDA requiring a pullup resistor, SCL clock input, push-pull ALERT output, and active-low RESET with an internal pull-up to VDD.
Key Features
- 0 to 100 %RH non-condensing humidity range
- ±0.5 %RH typical accuracy at 25°C
- -40 to 125 °C temperature sensor range
- 1.62 to 5.50 V recommended supply
- I2C-compatible interface supports up to 1 MHz
- Four selectable addresses from 0x44 to 0x47
- CRC checksum for I2C data protection
- Integrated heater for condensation and moisture dissipation
- Factory removable protective tape for PCB wash
- 8-pin WSON package plus thermal pad
Typical Applications
- Relative humidity measurement
- Temperature measurement
- I2C environmental sensing
- Low-current sensor nodes
- Condensation removal designs
- Multi-sensor I2C buses
- PCB wash process assemblies
- Conformal coating assemblies
Procurement Notes
When requesting a quote for HDC3021, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For memory and storage sourcing, density, organization, speed grade, voltage, package, temperature grade, date code, lifecycle status and original packing condition should be verified before approval.
FAQ
What type of sensor is the HDC3021?
The HDC3021 is a Texas Instruments digital relative humidity and temperature sensor. It is categorized as a Sensor and supplied in a WSON (8), 2.50 mm x 2.50 mm x 0.8 mm package.
What humidity range does the HDC3021 support?
The HDC3021 relative humidity operating range is 0 to 100 %RH under non-condensing conditions. Listed humidity accuracy depends on the RH span, including ±0.5 %RH typical over 10% to 50% RH at TA=25°C.
How is the HDC3021 I2C address configured?
The HDC3021 provides four selectable I2C addresses: 0x44, 0x45, 0x46, and 0x47. ADDR and ADDR1 set the address by connection to GND or VDD, and the extracted facts state they cannot be left floating.
Does the HDC3021 include condensation handling features?
Yes. The HDC3021 has an integrated heater used to dissipate condensation and moisture. The heater operating free-air temperature range is specified as -40 to 60 °C for condensation removal.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 28, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.