Proximity Sensors With Optical Switch Reside In SMT Package

Integrating an optical touch switch in their compact, surface-mount packages, the SFH7740 and SFH7741 proximity sensors use distance measurements to detect a mobile device’s operating status without physical contact to the sensor itself. This technology allows for the automatic shut-off of displays and keypads, improving performance and efficiency. The SFH7740 measures 3.7 mm x 3.7 mm x 1 mm and reacts to distances between 0.5 mm and 4.0 mm. It is small enough to fit in slider phones where it detects the position of the slider that reveals or hides the keypad. Depending on whether the slider is closed or open, the sensor switches the display lighting off or on. Otherwise similar, the SFH7741 reacts at a typical working distance of 20 mm and both sensors draw an operating current of approximately 50 µA. For more details and prices, call OSRAM OPTO SEMICONDUCTORS, San Jose, CA. (888) 446-7726.