Sensors Photointerrupter, encased type RPI-1391 The RPI-1391 is a transmissive-type photointerrupter that uses a photo IC. A positioning pin is provided on the external case to allow precise snap-in mounting on the PC board. Applications Optical control equipment External dimensions (Units: mm) Features 1) Small slit width (0.5 mm) for high precision. 2) Fast response. Absolute maximum ratings (Ta = 25C) 255 Sensors Electrical and optical characteristics (Ta = 25C) Electrical and optical characteristic curves 256 RPI-1391 Sensors RPI-1391 257