The OPB973N51 is a Photologic® Slotted Optical Switch with a buffered open collector output and a PCB through-hole design. This optical switch is designed to accurately detect the presence or absence of an object passing through its slot. It features a reliable circuitry that ensures precise and consistent sensing performance. The open collector output provides excellent flexibility for direct connection to various circuit configurations. With its PCB through-hole design, it can be easily mounted onto a printed circuit board, making it ideal for various industrial and commercial applications.