1 Features
• Relative humidity (RH) sensor:
– Operating range: 0% to 100%RH
– Accuracy: ±1%RH typical
– Long-term drift: 0.19%RH/yr
– Ratiometric Output: 10.0% to 90.0%VDD
• Temperature sensor:
– Operating range: –40°C to 125°C
– Accuracy: ±0.2°C typical
– Ratiometric Output: 12.3% to 87.7%VDD
• NIST traceability
• Output Short Circuit Protection
• Integrated heater
• High capacitive load drive up to 47nF
• Low power: 250μA typical active current
• Supply voltage: 1.62V to 5.50V

2 Applications
• Major Appliances:
– Dishwasher
– Washer & Dryer
– Refrigerator & Freezer
• Energy Infrastructure:
– Battery Energy Storage Systems
– Remote Power Distribution Automation
• HVAC
• Telecom power systems
• Printers
• Small Home appliances

3 Description
The HDC3120 is an integrated, capacitive based
relative humidity (RH) and temperature sensor
where the relative humidity and temperature sensor
results are represented as ratiometric analog output.
Conversion of signals to the analog domain provides
a robust design for applications requiring signal
transmission over wire or other distance-based
use cases. The device provides high accuracy
measurements over a wide supply range (1.62V –
5.5V) and low power consumption while maintaining
less than 0.19% long term drift per year. The
HDC3120 is available in a compact 2.5mm × 2.5mm
× 0.8mm WSON 8-pin package. Both the temperature
and humidity sensors are 100% tested and calibrated
on a production setup that is NIST traceable and
verified with equipment that is calibrated to ISO/IEC
17025 standards.