Specifications
| Type | Description |
|---|---|
| Part Number | HDC2021 |
| Manufacturer | Texas Instruments |
| Product Type | humidity and temperature sensor |
| Category | Sensors |
| Package / Case | WSON (DEB), 6-pin, 3.00 mm x 3.00 mm |
| RH Measurement Range | 0% to 100% RH |
| Temperature Measurement Range | -40°C to 125°C |
| Humidity Accuracy | ±2% typ, ±3% max RH |
| Temperature Accuracy | ±0.2°C typ, ±0.4°C max |
| Temperature Accuracy | ±0.2°C typ, ±0.7°C max |
| Supply Voltage | 1.62 V to 3.6 V |
| Sleep Mode Current | 0.05 µA typ, 0.1 µA max |
| Sleep Mode Current | 0.05 µA typ, 0.1 µA max |
| Average Supply Current | 0.55 µA typ |
| Average Supply Current | 0.3 µA typ |
| Supply Current During RH and Temperature Measurement | 650 µA typ, 890 µA max |
| Supply Current During Temperature Measurement | 550 µA typ, 730 µA max |
| Startup Current | 200 µA peak, 80 µA average |
| Serial Bus Active Current | 12 µA typ |
| Serial Bus Active Current | 12 µA typ |
| Heater Current | 90 mA typ |
| RH Repeatability | ±0.1% RH |
| Temperature Repeatability | ±0.1°C |
| RH Hysteresis | ±1% RH |
| RH Response Time | 6 s typ |
| RH Conversion Time | 254 µs typ |
| RH Conversion Time | 383 µs typ |
| RH Conversion Time | 640 µs typ |
| Temperature Conversion Time | 208 µs typ |
| Temperature Conversion Time | 336 µs typ |
| Temperature Conversion Time | 594 µs typ |
| RH Long-Term Drift | ±0.25% RH/year |
| Temperature Long-Term Drift | ±0.04°C/year |
| RH Supply Sensitivity | ±0.3% RH/V |
| Temperature Supply Sensitivity | 0.05°C/V |
| Temperature Sensor Operating Free-Air Temperature | -40°C to 125°C |
| Relative Humidity Sensor Operating Free-Air Temperature | -20°C to 70°C |
| Integrated Heater Operating Free-Air Temperature | -40°C to 85°C |
| Recommended RH Operating Range | 20% to 80% RH |
| I2C Clock Frequency | 10 kHz min, 400 kHz max |
| SCL Low Period | 1.3 µs min |
| SCL High Period | 0.6 µs min |
| Data Setup Time | 100 ns min |
| Data Hold Time | 0 µs min |
| Repeated START Setup Time | 0.6 µs min |
| Repeated START Hold Time | 0.6 µs min |
| STOP Setup Time | 0.6 µs min |
| SCL Rise Time | 300 ns max |
| SDA Rise Time | 300 ns max |
| SCL Fall Time | 20*(VDD/5.5 V) ns min, 300 ns max |
| SDA Fall Time | 20*(VDD/5.5 V) ns min, 300 ns max |
| Bus Free Time | 1.3 µs min |
| Data Valid Time | 0.9 µs max |
| Data Valid Acknowledge Time | 0.9 µs max |
| Power-On Reset Duration | 3.5 ms typ |
| Power-On Reset Voltage | 1.4 V typ |
| SCL/SDA High-Level Input Voltage | 0.7 x VDD min |
| SCL/SDA Low-Level Input Voltage | 0.3 x VDD max |
| SCL/SDA Low-Level Output Voltage | 0.4 V max |
| SCL Input Pin Capacitance | 1.7 pF typ |
| SDA Input Pin Capacitance | 1.6 pF typ |
| SCL Input Leakage Current | -0.1 µA min, 0.1 µA max |
| SDA Input Leakage Current | -0.1 µA min, 0.1 µA max |
| DRDY/INT High-Level Output Voltage | VDD - 0.2 V min |
| DRDY/INT High-Level Output Voltage | 2.4 V min |
| DRDY/INT High-Level Output Voltage | 1.1 V min |
| DRDY/INT Low-Level Output Voltage | 0.2 V max |
| DRDY/INT Low-Level Output Voltage | 0.4 V max |
| DRDY/INT Low-Level Output Voltage | 0.45 V max |
| DRDY/INT Hi-Z Output Leakage Current | -0.1 µA min, 0.1 µA max |
| VDD Absolute Maximum Voltage | -0.3 V to 3.9 V |
| ADDR Absolute Maximum Voltage | -0.3 V to 3.9 V |
| SCL Absolute Maximum Voltage | -0.3 V to 3.9 V |
| SDA Absolute Maximum Voltage | -0.3 V to 3.9 V |
| DRDY/INT Absolute Maximum Voltage | -0.3 V to VDD + 0.3 V |
| Junction Temperature | -40°C to 150°C |
| Storage Temperature | -65°C to 150°C |
| ESD Rating HBM | ±2000 V |
| ESD Rating CDM | ±500 V |
| Junction-to-Ambient Thermal Resistance | 57.9°C/W |
| Junction-to-Case Top Thermal Resistance | 58.7°C/W |
| Junction-to-Board Thermal Resistance | 27.0°C/W |
| Junction-to-Top Characterization Parameter | 5.6°C/W |
| Junction-to-Board Characterization Parameter | 26.9°C/W |
| Junction-to-Case Bottom Thermal Resistance | 16.5°C/W |
| I2C Address | 1000000X |
| I2C Address | 1000001X |
| SDA Pin Function | I2C serial data, open-drain output requiring pullup resistor |
| SCL Pin Function | I2C serial clock input |
| DRDY/INT Pin Function | Data ready/interrupt, push-pull output |
| Datasheet Status | request_only |
Product Overview
Texas Instruments HDC2021 is a humidity and temperature sensor supplied in a WSON (DEB), 6-pin, 3.00 mm x 3.00 mm package. It measures 0% to 100% RH and -40°C to 125°C temperature, with recommended supply operation from 1.62 V to 3.6 V. The temperature sensor recommended free-air range is -40°C to 125°C, the relative humidity sensor recommended free-air range is -20°C to 70°C, and the integrated heater recommended free-air range is -40°C to 85°C.
The device uses an I2C interface with 10 kHz to 400 kHz clock frequency. SDA is an open-drain I2C data pin requiring a pullup resistor, SCL is the I2C clock input, and DRDY/INT is a push-pull data-ready or interrupt output. HDC2021 supports 9-bit, 11-bit, and 14-bit conversion timing options, low sleep current, one-shot or continuous conversion operation, and an integrated heater for heater-enabled humidity measurement conditions.
Key Features
- 0% to 100% RH measurement range
- -40°C to 125°C temperature measurement range
- ±2% typical RH accuracy under stated conditions
- ±0.2°C typical temperature accuracy over specified ranges
- 1.62 V to 3.6 V recommended supply voltage
- 0.05 µA typical sleep current in no-measurement modes
- 10 kHz to 400 kHz I2C clock frequency
- Selectable 9-bit, 11-bit, and 14-bit conversion timing
- Integrated heater draws 90 mA typical when enabled
- DRDY/INT push-pull data-ready or interrupt output
Typical Applications
- Relative humidity measurement systems
- Temperature measurement systems
- I2C sensor nodes
- Low-duty-cycle monitoring designs
- Interrupt-driven measurement designs
- Heater-assisted humidity sensing
- Non-condensing RH operating environments
Procurement Notes
When requesting a quote for HDC2021, 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 analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What measurement ranges does HDC2021 support?
HDC2021 measures relative humidity from 0% to 100% RH and temperature from -40°C to 125°C. The recommended RH operating range is 20% to 80% RH under non-condensing conditions over 0°C to 60°C.
What supply voltage is recommended for HDC2021?
The recommended operating supply voltage for HDC2021 is 1.62 V to 3.6 V. The extracted electrical data also lists supply sensitivity across VDD=1.8 V to 3.6 V for RH and temperature measurements.
Which interface and pins are used by HDC2021?
HDC2021 uses an I2C interface with SCL and SDA pins supporting 10 kHz to 400 kHz clock frequency. SDA is open-drain and requires a pullup resistor, while DRDY/INT provides a push-pull data-ready or interrupt output.
What package is used for HDC2021?
HDC2021 is supplied in a WSON (DEB), 6-pin package measuring 3.00 mm x 3.00 mm. Thermal data is specified for the WSON (DEB), 6-pin package, including junction-to-ambient resistance of 57.9°C/W.
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.