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    Sensirion AG Switzerland
    • Home
    • Environmental Sensors
      • Humidity Sensors
        • Digital Humidity Sensor SHT4x (RH/T)
        • Digital Humidity Sensor SHT3x (RH/T)
        • Digital Humidity Sensor SHT85 (RH/T)
        • Digital Humidity Sensor SHTC3 (RH/T)
        • Digital Humidity Sensor SHTC1 (RH/T)
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        • SF2 Filter Cap
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        • Temperature Sensor STS3x
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      • CO2 Sensor STC31

        The most efficient way to measure high CO2 concentrations

        The STC31 is a chip-sized gas concentration sensor for high range, accurate CO2 measurements designed for high-volume production. The sensor is based on a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 the perfect choice for applications where reliability is key.

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    • Flow Sensors
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        • Lx – Compact Liquid Flow Meters
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      • Evaluation Kit SEK-Flow Sensing
      • Product Highlight

        Evaluation kit for the single-use liquid flow sensor LD20-2600B

        The LD20-2600B single-use liquid flow sensor for fast, precise and reliable measurements of the lowest flow rates in biomedical applications was successfully launched three years ago. The evaluation kit for this OEM liquid flow sensor can now also be purchased online via Sensirion's distribution network.

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        Experts for Smart Sensor Solutions

        Sensirion's sensors are used in a wide range of markets and different applications. Our high-quality environmental and flow sensors and sensor solutions improve energy efficiency and sustainability. They increase our safety, support our health and raise the quality of life. 

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    • Humidity Sensors
    • Digital Humidity Sensor SHT2x (RH/T)

    Digital Humidity Sensor SHT2x (RH/T)

    Used For A Variety Of Applications And Has Become The Industry Standard

    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.


    Overview of SHT2x Versions

    SeriesVersionTyp. Humidity
    Accuracy %RH
    Typ.
    Temperature °C
    Supply Voltage Range VInterfacePackage Size
    (L x W x H) mm
    SHT20Low-Cost±3±0.32.1 to 3.6I2C digital,
    PWM, SDM
    3 x 3 x 1.1
    SHT21Standard±2±0.32.1 to 3.6I2C digital,
    PWM, SDM
    3 x 3 x 1.1
    SHT25High-End±1.8±0.22.1 to 3.6I2C digital,
    PWM, SDM
    3 x 3 x 1.1
    • Download table as PDF

    Features

    Size3 x 3 x 1.1 mm
    OutputI²C digital, PWM, SDM
    Supply voltage range2.1 to 3.6 V
    Energy consumption3.2µW (at 8 bit, 1 measurement / s)
    RH operating range0 - 100% RH
    T operating range-40 to +125°C (-40 to +257°F)
    RH response time8 sec (tau63%)

    Delivery Conditions

    PackagingTape & Reel, sealed in ESD bag
    Packaging sizes

    SHT20: 1500 or 5000 pieces

    SHT21: 400, 1500 or 5000 pieces

    SHT25: 400 or 1500 pieces


    Download Image

    Download Center

    Here you can find all documents of Sensirion's humidity sensors for download.


    Accuracy Limits for Relative Humidity and Temperature

    Sensirion Humidity SHT2x Diagram
    Sensirion Humidity SHT2x Diagram

    Related Products

    Sensirion Humidity Sensors SHT3x

    Digital Humidity Sensor SHT3x (RH/T)

    The SHT3x humidity sensor is the established industry standard thanks to its performance, range of variants, and features.

    Sensirion Humidity Sensors SHTW2

    Digital Humidity Sensor SHTW2 (RH/T) (NRND)

    The ultra-small, digital 1.8 V SHTW2 humidity sensor convinces with its low power consumption and proven performance. Therefore it opens up countless opportunities for the Internet of Things.

    Sensirion Humidity Sensors SHTC1

    Digital Humidity Sensor SHTC1 (RH/T)

    The SHTC1 humidity sensor has become the standard for applications in consumer electronics. The 2 mm x 2 mm DFN package offers an ideal trade-off between robustness, ease of use and size.

    Sensirion Humidity Sensors SHT7x

    Digital Humidity Sensor SHT7x (RH/T) (End of Life)

    The easy replaceability and low power consumption make the digital pin-type SHT7x humidity sensor series the ultimate choice for even the most demanding applications.

    Sensirion Humidity Sensors SF2 FilterCap

    SF2 Filter Cap

    Easily mountable solution to protect SHT2x and SHT3x humidity sensors. The SF2 filter cap protects against water, dust, soot, particles and other contaminants.

    Sensirion Humidity Sensors SHT3x Smart-Gadget

    SHT31 Smart Gadget Development Kit

    The Smart Gadget is a simple reference design circuit board and development kit which demonstrates the outstanding performance and ease of use of Sensirion’s humidity and temperature sensors.

    Technical Documents

    • Datasheet SHT20
    • Datasheet SHT20P
    • Datasheet SHT20S
    • Datasheet SHT21
    • Datasheet SHT21P
    • Datasheet SHT21S
    • Datasheet SHT25
    • RoHS, REACH and Hal-Free Declaration Humidity Sensors

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