SB040292025 – CARBON MONOXIDE SENSOR SCHEMATIC BLOCK

This schematic block features the MICS‑5524, a compact metal-oxide (MOS) gas sensor designed for detecting carbon monoxide (CO) as well as other reducing gases such as hydrogen, ethanol, and ammonia. The sensor’s resistance changes in the presence of these gases, providing a sensitive analog signal that can be easily interfaced with a microcontroller or ADC.

Packaged in a small SMD form factor, this breakout-style module exposes the sensor terminals, heater pins, and power connections for easy integration. Its low power requirements and stable performance make it suitable for both portable and stationary air-quality or gas-leak detection applications.

The MICS‑552x family is widely adopted in environmental monitoring due to its compact size, multi-gas sensitivity, and long-term reliability.

Key Features:

• Compact metal-oxide (MOS) gas sensor
• Detectable gases: Carbon monoxide (CO), hydrogen, ethanol, ammonia, methane
• CO detection range: ~1 to 1,000 ppm
• Sensor resistance in clean air: ~100 kΩ to 1.5 MΩ
• Heater power: ~70–80 mW, heater voltage ~2.4 V
• Operating voltage: ~5 V
• Operating temperature: –30 °C to +85 °C
• Small SMD footprint: approx. 5 × 7 × 1.55 mm
• Reliable long-term performance for indoor and embedded applications

Typical Applications:

• Indoor carbon monoxide monitoring
• Air quality (IAQ) sensing systems
• Gas-leak detection (hydrogen, ethanol, VOCs)
• Combustible gas or VOC detection
• Portable safety devices
• Embedded environmental sensors

By integrating this Quickboards schematic block, engineers can quickly prototype analog gas-sensing systems, reduce design complexity, and leverage a reliable, multi-gas MOS sensor for air-quality or safety applications.