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

Videos & Training

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.

Lab on the Cloud

Lab on the Cloud

Renesas' Lab on the Cloud is an online environment where Renesas solutions, including popular evaluation boards, winning combinations and software, are hosted in a remote lab that customers access and test online.

Household Smoke Detector

This smoke detector solution using the RAA239101 low-power AFE IC with the RL78/G12 MCU includes peripherals and features for a photoelectric smoke detector system.

Winning Combinations

Winning Combinations

Renesas' complementary product portfolios of Analog + Power + Embedded Processing + Connectivity work together to deliver comprehensive solutions. Our product experts have developed "Winning Combinations," compelling product combinations that help our customers accelerate their designs and get to market faster.

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