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Reflective optical sensor

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article image Combines an IR emitter as the source and a photo diode as the receiver.

VISHAY Intertechnology, represented in Australia by Braemac , has released the surface-mount TCND5000 reflective sensor. It includes an IR emitter and PIN photodiode in a single package and is well suited for use in object presence sensors, touch sensors, and proximity sensors in a range of consumer, industrial and automotive applications.

It can operate at distances from 2mm to 40mm. It can be used in systems such as mobile phones which compensate for the proximity of the user's ear and adjust the volume of the speaker accordingly. It combines an IR emitter as the source and a photo diode as the receiver for the touch/proximity signal. The optical axes of the emitter and detector are parallel-aligned for optimised reflective operation.

The sensor's high-intensity IR emitter has an operating wavelength of 950nm, while a 950nm IR bandpass filter eliminates interference from daylight. An optical barrier between the emitter and detector reduces crosstalk to very low levels.

The sensor measures 6mm x 3.76mm x 3.9mm. These RoHS (restriction of hazardous substances) and WEEE-compliant devices meet JEDEC Level 4 standards and are available in a lead-free, surface-mount package. The sensors are designed for IR reflow soldering with a peak temperature of 260°C. They are therefore suitable for lead-free soldering.

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