Vishay Introduces VCSEL-Based Reflective Optical Sensor to Save Space and Improve Performance
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Update time : 2023-09-14 09:37:59
Vishay has introduced a new reflective photosensor for industrial, computer, consumer and mobile applications. Vishay Semiconductors' VCNT2030 offers improved performance over previous-generation solutions by saving space while providing a higher current-to-transfer ratio (CTR), longer sensing range and lower power consumption. Configured with a vertical-cavity surface-emitting laser (VCSEL) and silicon phototransistor, the product is packaged in a 1.85 mm x 1.2 mm x 0.6 mm miniature surface-mount package.
The recently released device features a compact construction with the emitting source and detector in the same plane. The VCSEL provides excellent internal crosstalk rejection due to its narrow ±17˚ emission angle, which also improves proximity performance behind the cover glass.The analog output signal of the VCNT2030 phototransistor is dependent on the amount of light emitted by the VCSEL and reflected from objects in the sensor's field of view. The device has a sensing distance of 15 mm, three times that of close competitors on the market. Due to its compact size, the VCNT2030 saves more than 40 percent of PCB space compared to the previous generation device, enabling the sensor to be used as a space-saving optical switching solution in industrial infrastructure, home and building controls, laptops and desktop computers, home appliances, consumer electronics, and metrology applications; optical encoders for motor control of electric bicycles, golf carts, tractors, and harvesters; and for printers and scanners. optical encoding in motor control for e-bikes, golf carts, tractors and harvesters; and paper detection in printers and scanners. In these applications, the low 8mA drive current of the device's VCSEL is sufficient to provide the same performance as solutions utilizing 20mA infrared emitters, resulting in a significant reduction in power consumption. The sensor has a detection range of 0.3 mm to 6 mm, an emission wavelength of 940 nm and a typical output current of 2.5 mA, which means a typical CTR of 31 % under test conditions. This value is more than 100 % higher than the previous generation of solutions and the closest competing sensors. The device has a reflow moisture sensitivity level (MSL) of 3 according to J-STD-020, is RoHS compliant, halogen-free, and meets Vishay's Green Standard.
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