TGS3870 Gas Sensor

1. Basic Information:

• Model: TGS3870-B00

2. Detected Gases:

• Methane (CH₄), carbon monoxide (CO)

3. Features:

• Compact Size: Φ9.2×13.0 mm, weight ~1.1 g.
• Low Power Consumption: Average power consumption of only 38 mW.
• High Sensitivity & Selectivity: Excellent sensitivity to methane and CO, with strong selectivity against interference.
• Low Cross-Sensitivity to Ethanol: Minimal response to ethanol vapor, a typical interfering gas in residential environments.
• Long Service Life & Cost-Effective: Designed for durability and low cost.
• RoHS 2 Compliant: UL-approved component.

4. Working Principle:

• Adopts MOS (Metal-Oxide-Semiconductor) sensing principle.
• Applies periodic high/low voltages (VHH = 0.9V for 5s, VHL = 0.2V for 15s) to the heater.
• Uses a micro-bead gas sensing structure to enable dual-gas detection (methane and CO) with a single sensor.

5. Drive Voltages:

• Heater Voltage: VHH = 0.9V (5s), VHL = 0.2V (15s)
• Circuit Voltage: 5.0V DC

6. Detection Range:

• Methane: 500–12,500 ppm
• Carbon monoxide: 50–1,000 ppm

7. Application Fields:

• Ideal for methane-CO composite alarms.
• Used in residential and industrial gas leak detection to ensure safety.

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