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 01hrs 09min 57sec
Learn More →
    Parts    Sensirion SHT4x Family    SHT40    SHT40-BD1F-R2
SHT40-BD1F-R2

SENSHT40-BD1F-R2

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

Overview

The SHT40-BD1F-R2 is a high-accuracy digital humidity and temperature sensor featuring an integrated PTFE membrane for protection against dust and water. Operating over a wide voltage range of 1.08V to 3.6V, this 4th-generation sensor provides calibrated I2C digital outputs in a compact 1.5x1.5mm DFN package.

Why Choose This Part

The sensor offers an excellent balance of precision with +/-1.8% RH accuracy and power efficiency for mobile applications. Its integrated PTFE membrane provides IP67-rated protection, ensuring long-term stability in harsh or polluted environments without additional potting.

Applications

HVAC Systems
Precise climate control and humidity monitoring in residential and industrial air conditioning units.
Battery Powered IoT
Ultra-low power consumption makes it ideal for remote environmental logging and wireless sensor nodes.
Cold Chain Logistics
Monitoring perishable goods during transport with a fast 4 second response time and reliable accuracy.
Smart Home Appliances
Integration into humidifiers, dehumidifiers, and refrigerators for automated environmental adjustment.

Key Specifications

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-WDFN Exposed Pad
Voltage - Supply 1.08V ~ 3.6V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 4-DFN (1.5x1.5)

Getting Started

Communicate with the sensor via the I2C interface using the standard Sensirion Arduino or Python libraries. Design the PCB with a thermal decoupling slot to prevent heat from the microcontroller from affecting temperature readings.

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-BD1F-R2 (this part) +/-1.8% RH I2C 4 s WDFN-4 1.08V —
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
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

Also Consider

SHT41-AD1B-R2 SENSensirion AG - Higher precision version of the SHT4x series with +/-1% RH accuracy for demanding measurement applications.
HDC2010 TITexas Instruments - Ultra-low power alternative in a WLCSP package for space-constrained wearable designs.