Gas Sensor MQ3 Sensitive Alcohol Gas for Breathalyzer


MQ3 is a semiconductor sensor which can detect the presence of alcohol gases, Ethanol, and smoke at concentrations from 0.05 mg/L to 10 mg/L. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air.

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It’s conductivity increases as the concentration of alcohol gases increases. It has high sensitivity to alcohol and has a good resistance to disturbances due to smoke, vapor and gasoline. MQ3 alcohol sensor can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc using an Analog to Digital Converter (ADC). You may also use a comparator to convert analog output to digital and a preset can be used along with it to adjust sensitivity.



  • Breathalyzer
  • Vehicle Alcohol Detector
  • Portable Alcohol Detector
  • Widely used in domestic alcohol gas alarm, industrial alcohol gas alarm and portable alcohol detector.



  • Wide detecting scope
  • Stable and long life
  • Good Sensitivity to Alcohol Gas
  • Fast response
  • Low cost
  • Long Life
  • Simple drive circuit
  • Analog and Digital Outputs
  • Trigger Level configuration Potentiometer



  • Sensor Type : Semiconductor
  • Standard Encapsulation : Plastic Cap
  • Detection Gas : Alcohol Gas
  • Concentration : 0.05 mg/L ~ 10 mg/L Alcohol
  • Circuit Voltage : 5V ±0.1 AC or DC
  • Heating Voltage : 5V ±0.1 AC or DC
  • Load Resistance : Adjustable depending on sensitivity
  • Heater Resistance : 33Ω ±5% at room temperature
  • Heating Consumption : < 750mW
  • Operation Temperature: -10°C to 70°C
  • Operation Humidity: 55% ±5% RH
  • Operating Voltage: DC 5V
  • Analog Output (AO): 0~5V analog output voltage
  • Digital Outout (DO): 0V or 5V output
  • Configuration: Through Potentiometer (adjusts the output level transition)
  • Preheat Duration: 20s
  • Weight: 5g
  • Dimensions: 23 x 19 x 19 mm