The OPB390T55Z is a compact photointerrupter transmissive module designed by OPTEK Technology. It features a 3.18mm phototransistor for high sensitivity and accuracy in detecting objects or interruptions. This module comes in a convenient 4-pin bag package, making it easy to integrate into various electronic applications. Whether used for precise object detection, motion sensing, or encoder applications, the OPB390T55Z offers reliable and efficient performance.