Figure 18. Pin assignment (tra…

Figure 18. Pin assignment (tra…

Sensirion AGSwitzerland

SHT40-AD1B-R2

ActiveHumidity, Moisture SensorsDFN

SENSOR HUMIDITY 100 RH SMD

SHT40-AD1B-R2 is a digital humidity and temperature sensor with base accuracy, I2C address 0x44, DFN package, operating temperature -40…125 °C, and heater support.Checked against the datasheet

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Technical parameters

Datasheet-verified parameters

25 items
ParameterValue and test conditionsSource
PackageDFN (4-pin dual-flat-no-leads)
Operating temperature range-40 °C ... 125 °C
Recommended normal temperature range5 °C … 60 °C
Recommended normal humidity range20 %RH … 80 %RH
VDD1.08 V … 3.6 V
Avg. current0.4 µA
Idle current80 nA
RH Accuracy±1.0 %RH (SHT45), Base accuracy (SHT40)
Temperature Accuracy±0.1 °C (SHT45), Base accuracy (SHT40)
I2C Address0x44
I2C ModesStandard, Fast mode, Fast mode plus (FM+)
Heater Power0 (=off), 20, 110, 200 mW (typical for VDD=3.3V)
Heater-on Duration0.1 s, 1 s
Maximal duty cycle10%
Storage temperature range-40 °C ... 150 °C
ESD HBM2 kV
ESD CDM500 V
Latch upJESD78 Class II, 125 °C, ±100 mA
RoHS CompliantYes (fully RoHS and WEEE compliant, free of Pb, Cd, and Hg)
QualificationJEDEC JESD47
Calibration CertificateSensor-specific calibration certificate acc. to ISO 17025: 2017 (available)
Measurement duration (Low repeatability)Typ. 1.3 ms, Max. 1.6 ms
Measurement duration (Med. repeatability)Typ. 3.7 ms, Max. 4.5 ms
Measurement duration (High repeatability)Typ. 6.9 ms, Max. 8.3 ms
Power-up timeTyp. 0.3 ms, Max. 1 ms
All parameters (15)ExpandCollapse
Power
Voltage - Supply1.08V ~ 3.6V
AC and DC characteristics
Accuracy±1.8% RH
Environment and package
Mounting TypeSurface Mount
Operating Temperature-40°C~125°C
PackageTape & Reel (TR); Cut Tape (CT)
Package / Case4-WDFN Exposed Pad
Supplier Device Package4-DFN (1.5x1.5)
Other
Humidity Range0 ~ 100% RH
MfrSensirion AG
Output16b
Output TypeDigital
Product StatusActive
Sensitivity-
Sensor TypeHumidity, Temperature
SeriesSHT4

Pinout and package

Figure 18. Pin assignment (tra…
Figure 18. Pin assignment (tra…
Package: DFN (4-pin dual-flat-no-leads)
PinNameFunctionSource
1SDA, Serial data, bidirectional
2SCL, Serial clock, unidirectional input
3VDD, Supply voltage
4VSS, Ground

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