High-Sensitivity Optical Sensor for Smoke Detection Applications

High-Sensitivity Optical Sensor for Smoke Detection Applications


The MAX30105 is an integrated particle-sensing module. It includes internal LEDs, photodetectors, optical elements, and low-noise electronics with ambient light rejection. The MAX30105 provides a complete system solution to ease the design-in process of smoke detection applications including fire alarms. Due to its extremely small size, the MAX30105 can also be used as a smoke detection sensor for mobile and wearable devices.

The MAX30105 operates on a single 1.8V power supply and a separate 5.0V power supply for the internal LEDs. It communicates through a standard I2C-compatible interface. The module can be shut down through software with zero standby current, allowing the power rails to remain powered at all times.

Along with Maxim’s sensor, customers need smart algorithms to detect the particles of interest. Maxim is partnering with Valor Inc. to develop state-of-the-art algorithms for smoke detection applications using the MAX30105. Contact Valor for licensing information at

MAX30105: Functional Diagram MAX30105: Functional Diagram Enlarge+

Key Features

  • High Sensitivity Optical Reflective Solution for detection of wide 
variety of particle sizes
  • Tiny 5.6mm × 3.3mm × 1.55mm 14-Pin Optical Module
    • Integrated Cover Glass for Optimal, Robust Performance
  • Ultra-Low Power Operation
    • Programmable Sample Rate and LED Current for Power Savings
    • Ultra-Low Shutdown Current (0.7µA, typ)
  • Robust Motion Artifact Resilience
    • High SNR
  • -40°C to +85°C Operating Temperature Range
  • Capable of Operating at High Ambient Levels
  • Excellent Ambient Rejection Capability


  • Fire Alarms
  • Smoke Detectors for Building Automation
  • Smoke Detectors for Mobile Devices
  • Smoke Detectors for Wearable Devices
Part Number Sensor Type ISUPPLY
Output Type Oper. Temp.
Package/Pins Budgetary
typ min max See Notes
MAX30105  Optical 600 1.7 2 I2C -40 to +85
$3.67 @1k
See All Optical Sensors (2)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX30105ACCEVKIT: Evaluation Kit for the MAX30105

Quality and Environmental Data

Product Reliability Reports: MAX30105.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources