CJMCU AK9750 Infrared Ray IR Four Quantum Infrared Human Body Detection Sensor

The CJMCU‑9750 is an ultra‑low‑power, compact infrared‑ray (IR) sensor module designed for reliable stationary human detection. It integrates four quantum IR sensing elements with a dedicated compensation IC, delivering precise and consistent performance across a wide temperature range.

Key Features

• Four calibrated quantum IR sensors with offset and gain compensation performed at shipment


• 16‑bit A/D converter for high‑resolution data output


• Integrated field‑of‑view limiter to reduce stray light interference


• Built‑in optical filter for enhanced signal‑to‑noise ratio


• Ultra‑low power consumption suitable for battery‑operated devices


• I²C/IIC communication compatible with 3.3 V – 5 V logic levels


• Compact footprint: 21 mm × 22 mm

Technical Specifications

• Supply Voltage: 3.3 V – 5 V


• Communication Interface: I²C (IIC) compatible with 3.3 V – 5 V


• Resolution: 16‑bit ADC


• Package Size: 21 mm × 22 mm


• Operating Temperature: –40 °C to +85 °C (typical for IR sensor modules)


• Power Consumption: Ultra‑low standby current (typical < 10 µA)

Typical Applications

• Stationary human presence detection for smart lighting and HVAC control


• Security and intrusion monitoring systems


• Energy‑saving automation in commercial and residential environments


• Touchless occupancy sensing in IoT devices