MQ303A Semiconductor Type Alcohol Sensor


Out of stock

Approx Restocking Date: 25 to 30 Days
SKU: 1004029
  1. Used to measure or detect Alcohol
  2. Can be used as a digital or analog sensor
  3. Long life and low cost
  4. Simple drive circuit


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Out of stock

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Category: Gas and Dust Sensor

Winsen Semiconductor Type Alcohol Sensor is an original and brand new mini size alcohol sensor for gift-type breathalyzer use.

The sensitive material of the MQ303B gas sensor is a semiconductor material which is with lower conductivity in clean air. When the target alcohol gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.

Semiconductor Type Alcohol Sensor has a high sensitivity to Alcohol gas. It is a kind of low-cost sensor for kinds of applications and also a mini size gift-type Alcohol sensor breathalyzer.

Applications :

It has a high sensitivity to alcohol and quick response and resume, widely used in portable alcohol gas detectors.


  1. Responsive to Alcohol gas
  2. Compatible with 5V
  3. Cost-efficient

Package Includes:

1 x MQ303A Semiconductor Type Alcohol Sensor

SKU: 1004029 Category:
Model Type


Sensor Type


Standard Encapsulation


Target Gas


Detecting Range

20~ 500ppm alcohol

Load Resistance


Heater Voltage

≤6V DC


R0(in air)/Rs(in 125ppm C2H5OH)≥3

Tem. Humidity:

20℃±2℃ 55%±5%RH

Shipping Weight 0.01 kg
Shipping Dimensions 2 × 2 × 2 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects.  Reimbursement or replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China