SB040282025 – NITROGEN DIOXIDE SENSOR SCHEMATIC BLOCK

This schematic block features the MICS‑2714, a MEMS-based metal-oxide sensor designed to detect nitrogen dioxide (NO₂) and hydrogen (H₂) in a compact SMD form factor. Its small footprint makes it ideal for embedded air-quality monitors and leak-detection systems where space is limited.

The sensor’s resistance changes in response to target gases, allowing easy interfacing via a simple voltage divider or ADC. It includes an integrated heater for stable operation and robust packaging to withstand temperature variations and mechanical stress.

The MICS‑27xx family is widely used in environmental and industrial applications for its durability, low heater current, and reliable multi-gas detection.

Key Features:

• Detects NO₂ and H₂
• Compact SMD package (approx. 5 × 7 × 1.55 mm)
• Low heater power (~43 mW nominal)
• Operating voltage: ~5 V
• Operating temperature: –30 °C to +85 °C
• NO₂ detection range: ~0.05 to ~10 ppm
• Ambient resistance in clean air: up to ~20 kΩ
• Highly robust — resistant to vibration and suitable for harsh environments

Typical Applications:

• Air-quality (NO₂) monitoring systems
• Industrial and environmental NOₓ sensing
• Hydrogen leak detection and safety systems
• Gas-leak monitors in consumer and embedded devices
• Portable or stationary environmental sensors

By integrating this Quickboards schematic block, engineers can quickly prototype reliable NO₂ and hydrogen sensing systems, simplify the analog front-end design, and use a rugged, compact gas sensor suitable for long-term real-world applications.