Vishay’s VCNL4010, VCNL4020, and VCNL3020 proximity sensors each combine an infrared emitter, PIN photodiode, and signal processing IC in a single package with a 16-bit ADC. With a range of up to 20 cm (7.9 in), these stand-alone, single-component solutions greatly simplify the use and design-in of proximity sensors in consumer and industrial applications. This application note will explore extending the range of these devices even further using external infrared emitting diodes (IRED) and drivers. In addition, mechanical design considerations will be discussed.