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Temperature and Humidity Digital Sensor BM25S2021-1

US$ 1.18
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The BM25S2021-1 is a high-precision, low-power, and cost-effective temperature and humidity digital sensor. The product is calibrated in factory to guarantee the measurement results are in high consistency. With the featured signal processing circuit and algorithm, the measurement data has extremely high stability and accuracy. The humidity data has been temperature-compensated, it can be used directly without secondary processing.

The product has 4 pins which include 2 power pins (VDD, GND) and 2 communication pins. The I2C interface and one-wire communication can be chosen to read data from the sensor. The I2C communication protocol uses the CRC-16 mechanism to ensure correct data transmission. The BM25S2021-1 is suitable for applications in temperature and humidity measurement, monitoring, and other related products, such as dehumidifiers, heating and cooling air conditioners, and Internet of Things applications.


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  1. Operating Voltage: 2.7V – 5.5V
  2. Low current consumption
    - Operating Current: < 2.5mA@5V
    - Standby Current: < 3µA
  3. Optional communication interface: I2C, one-wire
    - Minimum continuous read time: 2 seconds
    - I2C address: 1011100 (0x5C)
  4. Accurate relative humidity sensor
    - Sensing range: 10%RH – 95%RH
    - Resolution: 0.1% RH
    - Accuracy: ±3%RH
    - Resistive-type sensor
  5. Accurate temperature sensor
    - Sensing range: -40°C - 80°C
    - Resolution: 0.1°C
    - Accuracy: ±0.5°C
    - NTC sensor
  6. Factory-calibrated
Temperature sensor-Humidity sensor-Best Modules-module-Holtek-stable
  1. Dimension: 15.13 x 12.13 x 5.80 (mm)
  2. Net weight: 1.0 g
  3. Packing List: Temperature and Humidity Digital Sensor BM25S2021-1 x 1
  1. Module : Holtek BM25S2021-1, Temperature and Humidity Digital Sensor
  2. Application Note : AN0570EN, BM25S2021-1 Temperature and Humidity Digital Sensor, including example codes.
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