The highly integrated RAA239101 low-power analog front-end IC includes all necessary peripherals and features required for a complete smoke detector system based on photoelectric detection principle. It enables a very flexible implementation with parametrization capabilities (LED-current selection, PGA gain setting, integrated battery test feature).

System Benefits​:

  • Low-power analog front-end includes all necessary peripherals for a photoelectric smoke detector.
  • Ultra-low current consumption enables 10y+ battery lifetime.
  • Very few external components are needed with a cost-optimized bill-of-materials (BOM) and small solution size vs. a discrete design.
  • Highly integrated analog front-end (AFE) allows the use of two different IR wavelength diodes/photodetectors (enhanced accuracy, UL217 compliant).
  • Utilizes the small pin-count and low-cost RL78/G12 MCU with DataFlash, enabling non-volatile data storage for alarm counter, operating hours, etc.
  • AC mains power supply with small-sized and low quiescent current (IQ) AC/DC buck regulator (optional).




  • Residential smoke detectors based on photoelectric principle
Lab On The Cloud Demonstration for Household Smoke Detector Solution

Demonstration of Renesas’ Lab on the Cloud virtual environment for the Household Smoke Detector Solution.