www.sensirion.com / D1

Version 2

– July 2021

1/17

SHT4x

4th Generation, High-Accuracy, Ultra-Low-Power, 16-bit

Relative Humidity and Temperature Sensor

Features

• Relative humidity accuracy: up to ±1.5 %RH

• Temperature accuracy: up to ±0.1 °C

• Supply voltage: 1.08 V … 3.6 V

• Average current: 0.4 µA (at meas. rate 1 Hz)

• Idle current: 80 nA

• I2C fast mode plus, CRC checksum

• Operating range: 0…100 %RH, -40…125 °C

• Fully functional in condensing environment

• Variable power heater

• NIST traceability

• JEDEC JESD47 qualification

• Mature technology from global market leader

General Description

SHT4x is a digital sensor platform for measuring relative humidity and temperature at different

accuracy classes. The I2C interface provides several preconfigured I2C addresses and maintains

an ultra-low power budget. The power-trimmed internal heater can be used at three heating levels

thus enabling sensor operation in demanding environments. The four-pin dual-flat-no-leads

package is suitable for surface mount technology (SMT) processing.

Device Overview

Functional Block Diagram

Full product list on page 15

Products

Details

SHT40-AD1B

base RH&T accur., 0x44 I2C addr.

SHT40-BD1B

base RH&T accur., 0x45 I2C addr.

SHT41-AD1B

Intermed. RH&T accur., 0x44 I2C addr.

SHT45-AD1B ±1.5 %RH, ±0.1°C accur., 0x44 I2C addr.