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    Parts   Sensors  Humidity Sensors    Sensirion SHT4x Family    SHT40    SHT40-BD1B-R2
SHT40-BD1B-R2

SENSHT40-BD1B-R2

Sensirion AG
Humidity, Temperature 0 ~ 100% RH I2C ±1.8% RH 4 s Surface Mount
Active11,341 in stock
Datasheet Digi-Key Compare Prices

Overview

The SHT40-BD1B-R2 is a high-precision digital humidity and temperature sensor featuring a 4-pin UDFN package and I2C interface. It is designed for high-volume applications where ultra-low power consumption and a wide supply voltage range from 1.08V to 3.6V are critical.

Why Choose This Part

This sensor offers exceptional energy efficiency with a typical run current of 0.4 mA during active measurement and a fast 4-second response time. Its wide supply voltage compatibility allows for direct operation from single-cell batteries without additional LDOs.

Applications

Battery-Powered IoT Nodes
Utilizing the 80nA standby current to maximize battery life in remote wireless environmental monitors.
Smart HVAC Systems
Providing precise relative humidity measurements within +/-1.8% RH for indoor climate control.
Cold Chain Logistics
Monitoring perishable goods across an operating temperature range of -40C to +125C.
Consumer Electronics
Integrating into mobile devices and wearables due to the compact 1.5mm x 1.5mm footprint.

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

Interface the sensor via its I2C bus at the 0x45 address using 16-bit commands. Sensirion provides C and Arduino libraries that handle the CRC checksum verification for reliable data acquisition.

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-BD1B-R2 (this part) +/-1.8% RH I2C 4 s UDFN-4 1.08V 11,341
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-CD1B-R3 +/-1.8% RH I2C 4 s UDFN-4 1.08V 13,798
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

SHT41-AD1B-R2 SENSensirion AG - Higher precision variant for applications requiring tighter humidity and temperature tolerances.
HDC2010 TITexas Instruments - Alternative low-power digital sensor with similar I2C interface and small WLCSP packaging.
BME280 Bosch Sensortec - Integrated sensor that provides barometric pressure data in addition to humidity and temperature.

Categories

Sensors > Humidity Sensors