SHT45 Digital Temperature and Humidity Sensor Module I2C interface 1.8~3.6V

Description

The SHT45 Digital Temperature and Humidity Sensor Module is a compact, high-precision breakout board built around Sensirion’s flagship SHT45 sensor, the highest-accuracy variant in the SHT4x family. It provides fully calibrated, linearized, and temperature-compensated digital output over a standard I2C interface, making it the ideal choice for precision environmental monitoring, laboratory instruments, and demanding HVAC applications.

At the heart of the module is the SHT45 sensor, which delivers ±1.0% RH typical humidity accuracy and ±0.1°C typical temperature accuracy . The measurement range covers 0–100% RH and -40°C to +125°C, with fast response times of 4 seconds (humidity) and 2 seconds (temperature) . The sensor is factory-calibrated, eliminating the need for external trimming.

The SHT45 is designed for ultra-low power consumption, drawing an average supply current of just 0.4µA (at 1 Hz measurement rate) and an idle current of 80nA . The chip operates from 1.08V to 3.6V, making it perfect for single-cell battery applications and mobile devices . The I2C interface supports fast-mode plus communication with CRC checksum, and the default I2C address is 0x44 .

A key feature of the SHT45 is its integrated variable power heater, which can be activated to remove condensation or prevent creep effects in high-humidity environments . The sensor is fully functional in condensing environments and meets JEDEC JESD47 reliability standards .

Important Note: The SHT45 chip operates at 1.08–3.6V logic. Verify your specific breakout board’s voltage rating—some include onboard regulation and level shifting for 5V compatibility, while others are 3.3V-only . The sensor is not waterproof and should be kept dry. For harsh environments with dust or water exposure, the SHT45-AD1F variant with PTFE membrane is recommended .

Whether you are building a precision weather station, a laboratory-grade hygrometer, or a high-end HVAC controller, the SHT45 module provides the accuracy, low power, and reliability you need.

Features

• Sensirion SHT45 sensor — Highest-accuracy variant in the SHT4x family

• ±1.0% RH humidity accuracy — Industry-leading precision for demanding applications

• ±0.1°C temperature accuracy — Precise thermal measurement

• Ultra-low power consumption — 0.4µA average, 80nA idle current for battery-powered devices

• Wide measurement range — 0–100% RH and -40°C to +125°C

• I2C interface — Fast-mode plus with CRC checksum, default address 0x44

• Integrated variable power heater — Removes condensation and prevents creep in high-humidity environments

• Fast response — 4s humidity / 2s temperature response time

• Compact module form factor — Easy integration into enclosures and projects

• Wide application range — Precision monitoring, lab instruments, HVAC, weather stations

Technical Specifications