VCNL36825T Proximity Sensor Vishay VCNL36825T Proximity Sensor integrates a high-power Vertical-Cavity Surface-Emitting Laser (VCSEL), a photodiode for proximity measurement, and an Analog-to-Digital Converter (ADC) in a single, compact package. With a range up to 200mm, this stand-alone component simplifies the use and design-in of a proximity sensor as no mechanical barriers are required to optically isolate the emitter from the detector.