SHT41-AD1B-R2

Sensirion

-40℃~+125℃ 0%RH~100%RH 1.08V~3.6V 16bit 400nA Factory calibration、Built-in heater I2C ±0.2℃ ±1.8%RH DFN-4(1.5x1.5) Temperature and Humidity Sensor ROHS

Extended

Datasheetsensirion/SHT41-AD1B-R2

Category: Humidity, Moisture Sensors
Package: DFN-4(1.5x1.5)
Pins: 5

Overview

The SHT41-AD1B-R2 is a humidity, Moisture Sensor made by Sensirion in a DFN-4(1.5x1.5) package with 4 pins. -40℃~+125℃ 0%RH~100%RH 1.08V~3.6V 16bit 400nA Factory calibration、Built-in heater I2C ±0.2℃ ±1.8%RH DFN-4(1.5x1.5) Temperature and Humidity Sensor ROHS.

PCBKit's library has its KiCad symbol (Sensor_Humidity:SHT4x, from KiCad's library) and its footprint (Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad, from KiCad's library), ready for a KiCad board. 11,912 are in stock at JLCPCB (part C7461861). 9 open-source boards in 9 repositories on GitHub use it.

Symbol

Sensor_Humidity:SHT4xFrom KiCad's library

Footprint

Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPadFrom KiCad's library

From the datasheet

Supply, least: 1.08 V · VDD, recommended operating min · p. 9
Supply, most: 3.6 V · VDD, recommended operating max · p. 9
Works from: -40 °C · Operating temperature min · p. 10
Works up to: 125 °C · Operating temperature max · p. 10
Takes working: 320 µA · IDD, measurement, heater off, typical · p. 9
Takes at most: 100 mA · IDD, nominal 200 mW heater on, max · p. 9
Takes asleep: 80 nA · IDD, idle at 25 °C, typical · p. 9

What it is and has

Sensor: Relative humidity and temperature · p. 1
I2C address: 0x44 · p. 1
Interface: I2C FM+, CRC checksum · p. 1
Qualification: JEDEC JESD47 · p. 1
Condensing environment: Fully functional · p. 1

Specifications

Parameter	Conditions	As printed	Page
SHT41 RH accuracy	SHT41; typical accuracy at 25 °C	typ 1.8 %RH	4
Repeatability	high; 25 °C and 50 %RH; three times standard deviation	typ 0.08 %RH	4
Repeatability	medium; 25 °C and 50 %RH; three times standard deviation	typ 0.15 %RH	4
Repeatability	low; 25 °C and 50 %RH; three times standard deviation	typ 0.25 %RH	4
Resolution	A/D converter	typ 0.01 %RH	4
Hysteresis	At 25 °C; ± value	typ 0.8 %RH	4
Specified range	extended	min 0 · max 100 %RH	4
Response time	𝜏63%; measured at 25 °C and 1 m/s airflow	typ 4 s	4
Supply voltage VDD		min 1.08 · typ 3.3 · max 3.6 V	9
Power-up/down VPOR	Static power supply	min 0.6 · max 1.08 V	9
Slew rate of the supply voltage VDD, slew	Supply between VDD, min and VDD, max; faster slew rates may lead to a reset	max 20 V/ms	9
Supply current (heater off) IDD	Idle state; At 25 °C	typ 0.08 · max 1 uA	9
Supply current (heater off) IDD	Idle state; At 125 °C	max 3.4 uA	9
Supply current (heater off) IDD	Power up	typ 50 uA	9
Supply current (heater off) IDD	Measurement	typ 320 · max 500 uA	9
Supply current (heater off) IDD	Avg., high repeatability; continuous operation with 1 meas. per second	typ 2.2 uA	9
Supply current (heater off) IDD	Avg., med. repeatability; continuous operation with 1 meas. per second	typ 1.2 uA	9
Supply current (heater off) IDD	Avg., low repeatability; continuous operation with 1 meas. per second	typ 0.4 uA	9
Supply current (heater on) IDD	Nomin. heater “200 mW”	typ 60 · max 100 mA	9
Supply current (heater on) IDD	Nomin. heater “110 mW”	typ 33 · max 55 mA	9
Supply current (heater on) IDD	Nomin. heater “20 mW”	typ 6 · max 10 mA	9
Power consumpt. at VDD=1.2 V (no heater)	Avg., high repeatability; continuous operation with 1 meas. per second	typ 2.6 uW	9
Power consumpt. at VDD=1.2 V (no heater)	Avg., med. repeatability; continuous operation with 1 meas. per second	typ 1.4 uW	9
Power consumpt. at VDD=1.2 V (no heater)	Avg., low repeatability; continuous operation with 1 meas. per second	typ 0.5 uW	9
Low level input voltage VIL	Maximum is 0.3*VDD	min 0 V	9
Pull up resistors Rp	VDD < 1.62 V	min 820 Ω	9
Pull up resistors Rp	VDD ≥ 1.62 V	min 390 Ω	9
Low level output voltage VOL	VDD > 2.0 V, Rpullup > 390 Ω	max 0.4 V	9
Capacitive bus load Cb	RP ≤ 820 Ω: fast mode	max 400 pF	9
Capacitive bus load Cb	Rp = 390 Ω, VDD > 1.62 V: fast mode plus	max 340 pF	9
Power-up time tPU	After hard reset, VDD ≥ VPOR	typ 0.3 · max 1 ms	10
Soft reset time tSR	After soft reset; also valid for I2C general call reset	max 1 ms	10
Measurement duration tMEAS,l	Low repeatability; including tPU	typ 1.3 · max 1.6 ms	10
Measurement duration tMEAS,m	Med. repeatability; including tPU	typ 3.7 · max 4.5 ms	10
Measurement duration tMEAS,h	High repeatability; including tPU	typ 6.9 · max 8.3 ms	10
Heater-on duration tHeater	Long pulse	min 0.9 · typ 1 · max 1.1 s	10
Heater-on duration tHeater	Short pulse	min 0.09 · typ 0.1 · max 0.11 s	10
Operating temperature range		min -40 · max 125 °C	10
Storage temperature range		min -40 · max 150 °C	10
ESD HBM		max 2 kV	10
ESD CDM		max 500 V	10
Latch up, JESD78 Class II, 125 °C	±100 mA	min -100 · max 100 mA	10
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater off, die pad soldered; simulation	typ 246 K/W	16
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater on, die pad soldered; heater power 200 mW; simulation	typ 308 K/W	16
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater off, die pad not soldered; simulation	typ 297 K/W	16
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater on, die pad not soldered; heater power 200 mW; simulation	typ 357 K/W	16
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater off, die pad soldered; simulation	typ 189 K/W	16
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater on, die pad soldered; heater power 200 mW; simulation	typ 255 K/W	16
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater off, die pad not soldered; simulation	typ 191 K/W	16
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater on, die pad not soldered; heater power 200 mW; simulation	typ 257 K/W	16
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater off, die pad soldered; simulation	typ 159 K/W	16
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater on, die pad soldered; heater power 200 mW; simulation	typ 225 K/W	16
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater off, die pad not soldered; simulation	typ 193 K/W	16
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater on, die pad not soldered; heater power 200 mW; simulation	typ 258 K/W	16
Junction-to-board characterization param. Ψ𝐽𝐵	Heater off, die pad soldered; simulation	typ 159 K/W	16
Junction-to-board characterization param. Ψ𝐽𝐵	Heater on, die pad soldered; heater power 200 mW; simulation	typ 223 K/W	16
Junction-to-board characterization param. Ψ𝐽𝐵	Heater off, die pad not soldered; simulation	typ 191 K/W	16
Junction-to-board characterization param. Ψ𝐽𝐵	Heater on, die pad not soldered; heater power 200 mW; simulation	typ 254 K/W	16
Junction-to-top characterization param. Ψ𝐽𝑇	Heater off, die pad soldered; simulation	typ 38 K/W	16
Junction-to-top characterization param. Ψ𝐽𝑇	Heater on, die pad soldered; heater power 200 mW; simulation	typ 105 K/W	16
Junction-to-top characterization param. Ψ𝐽𝑇	Heater off, die pad not soldered; simulation	typ 44 K/W	16
Junction-to-top characterization param. Ψ𝐽𝑇	Heater on, die pad not soldered; heater power 200 mW; simulation	typ 112 K/W	16

Pins, by the datasheet

1 SDA: Serial data, bidirectional. · p. 16
2 SCL: Serial clock, unidirectional input. · p. 16
3 VDD: Supply voltage. · p. 16
4 VSS: Ground. · p. 16

Ordering codes, by the datasheet

SHT41-AD1B-R2: four-pin dual-flat-no-leads · Intermediate RH&T accuracy, 0x44 I2C address; quantity 2’500 · p. 21
SHT41-AD1B-R3: four-pin dual-flat-no-leads · Intermediate RH&T accuracy, 0x44 I2C address; quantity 10’000 · p. 21
SHT41-AD1F-R2: four-pin dual-flat-no-leads · Intermediate RH&T accuracy, 0x44 I2C address, patented PTFE membrane; quantity 2’500 · p. 21

Parameters

Current - Supply: 320uA
Current - Supply(Max): 100mA
Features: Built-in heater
Humidity: 0%RH~100%RH
Humidity Tolerance: ±1.8%RH
Interface: I2C
Operating Temperature: -40℃~+125℃
Resolution: 16bit
Standby Current: 80nA
Temperature Range: -40℃~+125℃
Temperature Tolerance: ±0.2℃
Voltage - Supply: 1.08V~3.6V

Order codes

SHT41-AD1B-R2LCSC C7461861

Pinout

The pins of the SHT41-AD1B-R2
Pin	Name	Type
1	SDA	Input/output
2	SCL	Input
3	VDD	Power in
4	VSS	Power in

Open-source boards using it

All 9

2 layers35 × 24 mm
CommonSense
antsouchlos/commonsense-hw
A BLE-based PCB for measuring humidity and temperature
37 partsMIT
2 layers25 × 141.9 mm
Sensor
Jan2121/bewaesserung-Sensor

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Ummon
JonaWe/ummon
ummon (from German Umgebungsmonitor, "environment monitor") is an ESP32-C6 based environmental sensor board with USB-C power.
95 parts
2 layers45 × 95 mm
Airquality
MorgenWebDigital/airquality
A battery-powered indoor air quality monitor. Real CO₂ from a photoacoustic sensor, VOC and NOx, temperature, humidity and ambient light, shown on a 2.13" e-paper display and sent over Bluetooth LE.
78 parts
2 layers40 × 40 mm
Airqualitymini
MorgenWebDigital/airqualitymini
A stationary indoor air quality sensor. Real CO₂, VOC and NOx, temperature and humidity. No display, no battery. Powered from USB-C, read out over Bluetooth LE.
32 parts
2 layers50 × 55 mm
Candidate
zhxymj/CircuitTutor
中文需求 → 可编辑原理图 → 确定性门禁复验（ERC / ngspice / KiCad）
11 partsMIT
4 layers42 × 85 mm
Device
jayis1/hardware-design-lab
Full-cycle hardware device designs — each device in its own subfolder with architecture, schematics, PCB layout, and software stack
26 parts
2 layers100 × 103.5 mm
Display board
mckay27/hstat

66 parts

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Questions

Is there a KiCad symbol and footprint for the SHT41-AD1B-R2?

Yes. The symbol is Sensor_Humidity:SHT4x and the footprint Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad, both drawn on this page. PCBKit places them on a board for you when you design with it.

What package is the SHT41-AD1B-R2?

DFN-4(1.5x1.5), with 4 pins. Its footprint is drawn on this page.

Where is the SHT41-AD1B-R2 datasheet?

Sensirion publishes it: the Datasheet link on this page opens it.

Where can I order the SHT41-AD1B-R2?

JLCPCB lists it as part C7461861, with 11,912 in stock; the sellers' links on this page open their listings.

Which open-source boards use the SHT41-AD1B-R2?

9 boards in 9 repositories on GitHub; the most starred are listed on this page, with their KiCad files.