3D iToF is a three-dimensional sensing technology based on the principle of time-of-flight ranging. It accurately calculates the propagation distance of light by emitting modulated light signals and detecting the phase changes after reflection from objects, thus achieving high-precision three-dimensional modeling of the spatial environment. Compared to traditional two-dimensional vision solutions, 3D iToF offers advantages such as high precision, strong environmental adaptability, low power consumption, and strong real-time performance, effectively acquiring depth information and spatial structure of objects. SI 3D iToF products integrate high-performance analog front-ends, advanced signal processing algorithms, and low-power chip design, supporting fast and accurate depth perception. They are widely used in smartphones, AR/VR, smart homes, robotics, industrial inspection, and autonomous driving, providing a reliable three-dimensional perception entry point for machine vision and physical AI, and helping smart devices achieve more natural and accurate human-computer interaction.