The SI1143-A11-YM0 is an IR optical sensor that detects proximity and measures the intensity of ambient light. The device operates at a wavelength of 850nm and has a voltage supply range of 1.71V to 3.6V. It is designed to be mounted using SMD (SMT) technology and has an I2C output type. The sensor comes in a 10-WFQFN package with a temperature range of -40°C to 85°C. The SI1143-A11-YM0 is ideal for use in a variety of applications, including mobile devices, healthcare, and home automation.