Reflective optical sensor saves space and delivers improved performance

15-07-2022 | Vishay | Lighting Technologies

Vishay Intertechnology, Inc offers a new AEC-Q101 qualified reflective optical sensor for automotive, smart home, industrial, and office applications. Providing a lower profile than previous-generation solutions – while providing improved performance with a higher CTR and operating temperature – the Vishay Semiconductors VCNT2025X01 incorporates an infrared emitter, silicon phototransistor detector, and daylight blocking filter in a miniature 2.5mm x 2mm x 0.6mm surface-mount package.

The device provides a compact construction in which the emitting light source and detector are arranged in the same plane. The sensor's analog output signal at the phototransistor depends on the light emitted by the IR LED and reflected off an object in the sensor's field of view. A built-in daylight blocking filter suppresses disturbing ambient light significantly, thereby improving the SNR. The device's robust FAM package lowers crosstalk and provides wettable flanks to allow optical inspection of the solder joints.

The device's 0.6mm profile is 0.2mm lower than previous-generation devices, permitting the sensor to serve as a space-saving solution for optical switching in automotive electronic systems, office equipment, and home appliances; optical encoding in industrial automation systems; and paper presence detection in printers and copy machines. For these applications, the device offers high-temperature operation to +110C, compared to +80C for the closest competing device.

The sensor provides a detection range of 0.3mm to 4.5mm, an emitter wavelength of 940nm, and a typical output current of 6.6mA, representing a typical CTR of 33% under test conditions. This value is 24% higher than previous-generation solutions and 23% higher than the closest competing sensor. The device features a MSL of 3 for reflow soldering according to J-STD-020; it is RoHS-compliant, halogen-free, and Vishay Green.

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