MQ-3 Alcohol Gas Sensor

Name: MQ-3 Alcohol Gas Sensor
SKU: TS-P1423
Availability: InStock

The MQ-3 Working Principle. When alcohol vapours are present, they react with oxygen ions on the surface of the tin dioxide (SnO₂) layer, reducing resistance.

$4.25

10 in stock

This item: MQ-3 Alcohol Gas Sensor

10 in stock

$4.25

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Title	Qty	Discount
Qty Discount	4 - 9	5% $4.04
Qty Discount	10 +	8% $3.91

SKU: TS-P1423

Categories:Components & Parts, Gas Sensor

Description

Additional information

Applications

Support & Utility

Q & A

The MQ-3 is a semiconductor-based gas sensor designed primarily for detecting alcohol vapours in the air. It uses a SnO₂ (tin dioxide) sensing layer whose conductivity changes when exposed to alcohol gas.
The sensor provides an analog output proportional to the gas concentration, making it ideal for breathalysers, safety, and automotive applications.

Specifications:

Gas sensor – MQ-3
Detectable Gases: Alcohol, ethanol, smoke
Detection range: 0.05 mg/L – 10 mg/L alcohol
Heater voltage (V<sub>H</sub>): 5V ±0.2V
Heater resistance:31 Ω ±3 Ω
Load resistance: Adjustable (typically 200 kΩ)
Heater consumption: ≤900 mW
Preheat time: 24 hours for best stability
Output type: Analog voltage (0–5V)
Dimensions: 16.5mm Diameter, 9.5mm High excluding pins, Pins – 6mm

Package Includes:

MQ-3 Alcohol Gas Sensor

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