SHT40-AD1B-R2

Sensirion

Extended

Datasheetsensirion/SHT40-AD1B-R2

Category: Temperature And Humidity Sensor
Package: DFN-4-EP(1.5x1.5)
Pins: 5

Overview

The SHT40-AD1B-R2 is a temperature And Humidity Sensor made by Sensirion in a DFN-4-EP(1.5x1.5) package with 4 pins.

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. 16,216 are in stock at JLCPCB (part C2909890). 42 open-source boards in 41 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. 7
Supply, most: 3.6 V · VDD, recommended operating max · p. 7
Works from: -40 °C · Operating temperature min · p. 8
Works up to: 125 °C · Operating temperature max · p. 8
Takes working: 350 µA · VDD, typical while measuring, heater off · p. 7
Takes at most: 500 µA · VDD, max while measuring, heater off · p. 7
Takes asleep: 100 nA · VDD, typical idle current at 25°C · p. 7

What it is and has

Sensor: 16-bit relative humidity and temperature sensor · p. 1
Accuracy class and address: Base RH&T accuracy; 0x44 I2C address · p. 1
Interface: I2C fast mode plus, CRC checksum · p. 1
Heater: Variable power heater · p. 1
Condensation: Fully functional in condensing environment · p. 1
Qualification: JEDEC JESD47 · p. 1
Traceability: NIST traceability · p. 1

Specifications

Parameter	Conditions	As printed	Page
SHT40 RH accuracy1	SHT40; typical accuracy ±1.8 %RH at 25°C	typ 1.8 %RH	4
Repeatability2, 3	High repeatability; 25°C and 50%RH; 3σ	typ 0.08 %RH	4
Repeatability2, 3	Medium repeatability; 25°C and 50%RH; 3σ	typ 0.15 %RH	4
Repeatability2, 3	Low repeatability; 25°C and 50%RH; 3σ	typ 0.25 %RH	4
Resolution4	A/D converter	typ 0.01 %RH	4
Hysteresis	±1 %RH	min -1 · max 1 %RH	4
Specified range5	extended6	min 0 · max 100 %RH	4
Response time7	t63%; 25°C, 1 m/s airflow	typ 6 s	4
Long-term drift8	Typical value <0.25; normal RH/T operating range	typ 0.25 %RH/y	4
Supply voltage VDD		min 1.08 · typ 3.3 · max 3.6 V	7
Supply current (no heater) IDD	Idle state; 25°C	typ 0.1 · max 1 uA	7
Supply current (no heater) IDD	Idle state; 125°C	max 3.4 uA	7
Supply current (no heater) IDD	Measurement	typ 350 · max 500 uA	7
Supply current (no heater) IDD	Average; high repeatability; one measurement per second	typ 2.4 uA	7
Supply current (no heater) IDD	Average; medium repeatability; one measurement per second	typ 1.3 uA	7
Supply current (no heater) IDD	Average; low repeatability; one measurement per second	typ 0.4 uA	7
Power consumpt. at VDD=1.2V (no heater)	Average; high repeatability; one measurement per second	typ 2.9 uW	7
Power consumpt. at VDD=1.2V (no heater)	Average; medium repeatability; one measurement per second	typ 1.6 uW	7
Power consumpt. at VDD=1.2V (no heater)	Average; low repeatability; one measurement per second	typ 0.5 uW	7
Low level input voltage VIL	Minimum 0 V; maximum 0.3*VDD	min 0 V	7
Pull up resistors Rp	VDD < 1.62 V	min 820 Ω	7
Pull up resistors Rp	VDD ≥ 1.62 V	min 390 Ω	7
Low level output voltage VOL	VDD > 2.0V, Rpullup > 390 Ω	max 0.4 V	7
Cap bus load Cb	RP ≤ 820 Ω: fast mode	max 400 pF	7
Cap bus load Cb	Rp = 390 Ω, VDD > 1.62 V: fast mode plus	max 340 pF	7
Power-up time tPU	After hard reset, VDD ≥ VPOR	typ 0.3 · max 1 ms	8
Soft reset time tSR	After soft reset; also valid for I2C general call reset	max 1 ms	8
Measurement duration tMEAS,l	Low repeatability	typ 1.3 · max 1.7 ms	8
Measurement duration tMEAS,m	Medium repeatability	typ 3.7 · max 4.5 ms	8
Measurement duration tMEAS,h	High repeatability	typ 6.9 · max 8.2 ms	8
Heater-on duration tHeater	Long pulse	min 0.9 · typ 1 · max 1.1 s	8
Heater-on duration tHeater	Short pulse	min 0.09 · typ 0.1 · max 0.11 s	8
Operating temperature range		min -40 · max 125 °C	8
Storage temperature range11		min -40 · max 150 °C	8
ESD HBM		max 2 kV	8
ESD CDM		max 500 V	8
Latch up, JESD78 Class II, 125°C	+-100 mA	min -100 · max 100 mA	8
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater off, die pad soldered	typ 246 K/W	14
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater on, die pad soldered; heater power 200 mW	typ 308 K/W	14
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater off, die pad not soldered	typ 297 K/W	14
Junction-to-ambient thermal resistance 𝑅𝜃𝐽𝐴	Heater on, die pad not soldered; heater power 200 mW	typ 357 K/W	14
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater off, die pad soldered	typ 189 K/W	14
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater on, die pad soldered; heater power 200 mW	typ 255 K/W	14
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater off, die pad not soldered	typ 191 K/W	14
Junction-to-case thermal resistance 𝑅𝜃𝐽𝐶	Heater on, die pad not soldered; heater power 200 mW	typ 257 K/W	14
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater off, die pad soldered	typ 159 K/W	14
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater on, die pad soldered; heater power 200 mW	typ 225 K/W	14
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater off, die pad not soldered	typ 193 K/W	14
Junction-to-board thermal resistance 𝑅𝜃𝐽𝐵	Heater on, die pad not soldered; heater power 200 mW	typ 258 K/W	14
Junction-to-board characterization param. Ψ𝐽𝐵	Heater off, die pad soldered	typ 159 K/W	14
Junction-to-board characterization param. Ψ𝐽𝐵	Heater on, die pad soldered; heater power 200 mW	typ 223 K/W	14
Junction-to-board characterization param. Ψ𝐽𝐵	Heater off, die pad not soldered	typ 191 K/W	14
Junction-to-board characterization param. Ψ𝐽𝐵	Heater on, die pad not soldered; heater power 200 mW	typ 254 K/W	14
Junction-to-top characterization param. Ψ𝐽𝑇	Heater off, die pad soldered	typ 38 K/W	14
Junction-to-top characterization param. Ψ𝐽𝑇	Heater on, die pad soldered; heater power 200 mW	typ 105 K/W	14
Junction-to-top characterization param. Ψ𝐽𝑇	Heater off, die pad not soldered	typ 44 K/W	14
Junction-to-top characterization param. Ψ𝐽𝑇	Heater on, die pad not soldered; heater power 200 mW	typ 112 K/W	14

Pins, by the datasheet

1 SDA: Serial data, bidirectional. · p. 13
2 SCL: Serial clock, unidirectional input. · p. 13
3 VDD: Supply voltage. · p. 13
4 VSS: Ground. · p. 13

Ordering codes, by the datasheet

SHT40-AD1B-R2: DFN · Base RH&T accuracy; 0x44 I2C address; blank package without membrane; tape on reel, 2’500 pieces. · p. 15

Parameters

Current - Supply: 350uA
Current - Supply(Max): 500uA
Features: Factory calibration
Humidity: 0%RH~100%RH
Humidity Tolerance: ±1.8%RH
Interface: I2C
Operating Temperature: -40℃~+125℃
Resolution: 16bit
Standby Current: 100nA
Temperature Range: -40℃~+125℃
Temperature Tolerance: ±0.2℃
Voltage - Supply: 1.08V~3.6V

Order codes

SHT40-AD1B-R2LCSC C2909890

Pinout

The pins of the SHT40-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 42

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Desk dashboard
rspolyak/desk-dashboard-hw
ESP32-S3 desk dashboard board that plugs straight into a 3.5" MSP3526 capacitive touch display. USB-C powered, with a light sensor, SHT40 temperature/humidity sensor and a 41.5 × 35 mm 2-layer PCB
36 parts9MIT
4 layers66 × 36 mm
Gas sensor
JamesTwallin/gas_sensor
A tiny plug-in board for the rev E phone-companion board. It stands upright in a notch in rev E's sensor end, between the two gas sensor cans, and pokes 4.5 mm out through a slot in the case face, so its tip sits in the…
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Cryobelt
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Open source hardware to monitor temperature, humidity and VOC in an indoor environment
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Mixed signal Board Rev D
Akhilesh-design-02/STM32F407-Hardware-Design
4-layer STM32F407 mixed-signal PCB design featuring I2C/I2S/USB interfaces, SGP40 & SHT40 sensors, power plane splits, and star grounding for noise isolation.
92 parts

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Questions

Is there a KiCad symbol and footprint for the SHT40-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 SHT40-AD1B-R2?

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

Where is the SHT40-AD1B-R2 datasheet?

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

Where can I order the SHT40-AD1B-R2?

JLCPCB lists it as part C2909890, with 16,216 in stock; the sellers' links on this page open their listings.

What can replace the SHT40-AD1B-R2?

Parts like it in the library: the SHT40-BD1B-R2 by Sensirion, the SHT40I-AD1B-R3 by Sensirion, the SHT41-AD1B-R3 by Sensirion and the SHT40I-BD1B-R3 by Sensirion. Check their datasheets: a part that fits the footprint may still differ in its ratings.

Which open-source boards use the SHT40-AD1B-R2?

42 boards in 41 repositories on GitHub; the most starred are listed on this page, with their KiCad files.