EmbeddedRelated.com
Jacob Beningo
Live online course · Jacob Beningo
AI for Embedded Developers
$100 off for EmbeddedRelated readers until Nov 1 · 5 live sessions, Dec 7-11
Discount ends in
15days 00hrs 51min 39sec
Learn More →
    Parts   Sensors  Humidity Sensors    Sensirion SHT4x Family    SHT40    SHT40-CD1B-R3
SHT40-CD1B-R3

SENSHT40-CD1B-R3

Sensirion AG
Humidity, Temperature 0 ~ 100% RH I2C ±1.8% RH 4 s Surface Mount
Active13,798 in stock
Datasheet Digi-Key Compare Prices

Overview

The SHT40-CD1B-R3 is a high-accuracy digital humidity and temperature sensor from Sensirion's fourth-generation platform. This ultra-low-power CMOSens device provides 16-bit calibrated digital outputs over an I2C interface and operates across a wide supply voltage range of 1.08V to 3.6V. Its compact 4-UDFN package and robust performance in condensing environments make it suitable for demanding mobile and battery-powered applications.

Why Choose This Part

The SHT40 offers a high accuracy of +/-1.8% RH and features a fast 4s response time. It is designed for maximum efficiency with a low supply current and includes a built-in heater with multiple power levels for self-decontamination and operation in high-humidity conditions. Its wide operating temperature range of -40degC to 125degC ensures reliability in extreme environments.

Applications

HVAC and Air Quality Monitoring
Precise environmental sensing in smart thermostats and room monitors to optimize energy efficiency and indoor comfort.
Battery-Powered IoT Nodes
Ideal for remote weather stations and asset trackers where ultra-low power consumption is critical for long battery life.
Cold Chain Logistics
Ensuring temperature and humidity compliance during the transport and storage of sensitive pharmaceuticals and food products.
Respiratory Devices
High-reliability moisture and thermal sensing for medical humidifiers and CPAP machines.

Key Specifications

Output 16b
Accuracy +/-1.8% RH
Output Type I2C
Sensor Type Humidity, Temperature
Mounting Type Surface Mount
Response Time 4 s
Humidity Range 0 ~ 100% RH
Package / Case 4-UDFN Exposed Pad
Voltage - Supply 1.08V ~ 3.6V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 4-DFN (1.5x1.5)

Getting Started

Engineers can evaluate this sensor using the Sensirion SEK-SHT40-Sensors evaluation kit. Integration is straightforward via the I2C bus; open-source driver libraries are available for major platforms including Arduino and STM32. Ensure the thermal pad is correctly soldered and follow the manufacturer's layout guidelines to prevent heat transfer from nearby components from affecting sensor accuracy.

Part of Sensirion SHT4x family » SHT40

SHT40 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Accuracy Output Type Response Time Package Voltage Stock
SHT40-CD1B-R3 (this part) +/-1.8% RH I2C 4 s UDFN-4 1.08V 13,798
SHT40-AD1F-R2 +/-1.8% RH I2C 4 s WDFN-4 1.08V 13,226
SHT40-BD1B-R3 +/-1.8% RH I2C 4 s UDFN-4 1.08V 13,490
SHT40-AD1B-R3 +/-1.8% RH I2C 4 s WDFN-4 1.08V 16,564
SHT40-BD1B-R2 +/-1.8% RH I2C 4 s UDFN-4 1.08V 11,341
SHT40I-HD1F-R2 +/-2.5% RH Analog Voltage 4 s WDFN-4 4.5V 2,147
SHT40-AD1B-R2 +/-1.8% RH I2C — WDFN-4 1.08V 9,656
SHT40I-BD1B-R3 +/-2% RH I2C 4 s UDFN-4 2.3V 12,446
SHT40I-HD1B-R2 +/-2.5% RH I2C 4 s WDFN-4 4.5V 868
SHT40-AD1P-R2 +/-1.8% RH I2C 6 s UDFN-4 1.08V 6,395
SHT40-BD1F-R2 +/-1.8% RH I2C 4 s WDFN-4 1.08V —

Also Consider

HDC2010 TITexas Instruments - Offers comparable low power consumption and a very small WLCSP package for space-constrained designs.

Categories

Sensors > Humidity Sensors