The gas sensor – MQ3 is used in gas leakage detecting equipment’s in consumer and industry markets, this sensor is suitable for detecting LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke. It has a high sensitivity and fast response time.


  1. High quality double panel design, with power indicator and TTL output signal. 
  2. Have DO switch signal(TTL) output and AO analog signal output.
  3. TTL output signal for low level effectively. (when the low output electric signal lights at ordinary times, can be directly connect single chip microcomputer or relay module)
  4. Analog output voltage with concentration, the higher concentration, the higher voltage.
  5. Has better sensitivity with the liquefied petroleum gas, natural gas, city gas, smoke.
  6. Has long service life and reliable stability.
  7. Rapid response recovery features.


  1. Input voltage: DC5V


    1. VCC: Positive (5 v)
    2. GND: Connect power negative
    3. DO: TTL switch signal output
    4. AO: Analog signal output


    1. Domestic Alcohol gas alarm.
    2. Industrial Alcohol gas alarm.
    3. Portable Alcohol detector.


    1. 1 X Alcohol Gas Sensor Module MQ-3
  2. Power consumption (current) : 150 mA
  3. DO output: TTL digital 1 and 0 (0.1 and 5 V)
  4. AO output: 0.1-0.3 V (pollution-free)
  5. Highest concentration of voltage: Approx 4 V
  6. Detection range of alcohol: detection range of 10 ~ 1000 PPM


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