SHT21S

Not recommended for new designs

±2% Digital humidity and temperature sensor with SDM interface

Specification

Humidity
Typ. relative humidity accuracy
2
%RH
Operating relative humidity range
0 - 100
%RH
Response time (τ63%)
8
s
Calibration certificate
Factory calibration
Temperature
Typ. temperature accuracy
0.3
°C
Operating temperature range
-40 - 125
°C
Response time (τ63%)
5
s
Generic
Supply voltage
2.1 - 3.6
V
Average supply current
160
μA
Interfaces
SDM
Package size (LxWxH)
3 x 3 x 1.1
mm³
Packaging size
400, 1500, 5000
pcs (T&R)

Technical downloads

Name
Type
Date
File
Size
Datasheet SHT21S
Datasheet
05/2014
PDF
417.3 KB
CRC cecksum calculation SHT2x
Application note
12/2011
PDF
137.0 KB
Embedding SHT2x in 5V supply
Application note
06/2012
PDF
186.9 KB
STEP file SHT2x
CAD
10/2021
ZIP
151.4 KB
Calibration certification SHT
Certificate
08/2021
PDF
110.4 KB
Conditions of thermal comfort
Application note
02/2010
PDF
63.0 KB
ESD, Latch-up and EMC
Application note
03/2009
PDF
148.9 KB
How to understand specification of relative humidity sensors
Application note
04/2021
PDF
306.8 KB
Humidity at a glance
Application note
06/2021
PDF
178.3 KB
Introduction to humidity
Application note
08/2009
PDF
224.9 KB
Design-in guide SHT/STS
User guide
05/2019
PDF
458.7 KB
Handling instructions SHT
User guide
06/2021
PDF
313.4 KB
REACH and RoHS declaration SHT/STS
Certificate
07/2021
PDF
93.6 KB
Humidity sensors brochure
Flyer
01/2022
PDF
936.7 KB
Indoor air quality brochure
Flyer
10/2021
PDF
7.7 MB

The digital SHT2x humidity sensor series is used in high volumes in a wide variety of applications and has today become the de facto industry standard. The SHT2x series consists of a low-cost version with the SHT20 humidity sensor, a standard version with the SHT21 humidity sensor, and a high-end version with the SHT25 humidity sensor. The open cavity mold package - which encapsulates the complete chip except for the humidity sensor area - protects the capacitive humidity sensor against external impact and facilitates excellent long-term stability. The SHT2x sensors are available both in large and small volumes.

Embedded in a reflow solderable dual-flat no-leads (DFN) package of 3 × 3 × 1.1 mm³, the SHT2x provides calibrated, linearized sensor signals in digital, I²C format. The SHT2x humidity sensor series contains a capacitive-type humidity sensor, a band-gap temperature sensor, and specialized analog and digital integrated circuits – all on a single CMOSens® chip. This yields superior sensor performance in terms of accuracy and stability as well as minimal power consumption.

Every sensor is individually calibrated and tested. Lot identification is printed on the sensor and an electronic identification code is stored on the chip – which can be read out on command. Furthermore, the resolution of the SHT2x humidity sensor can be changed on command (8/12 bit up to 12/14 bit for RH/T) and a checksum helps to improve communication reliability. With this set of features and its proven reliability and long-term stability, the SHT2x humidity sensor series offers an outstanding price-performance ratio. To test a humidity sensor from the SHT2x series, two evaluation kits, EK-H4 and EK-H5, are available.

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