The OPB961T51 is a photointerrupter transmissive sensor with a compact design and a detection gap of 3.18mm. It features a photologic output signal, open collector configuration, and a built-in buffer for automotive applications. This sensor is packaged in a 5-pin bag, making it easy to install and integrate into various systems. The OPB961T51 offers reliable and precise detection capabilities, making it suitable for a wide range of industrial and automotive applications.