Choice of output configuration Printed circuit board mounting Opaque plastic housing Low profile 0.080” (2.03 mm) wide slot 0.275” (6.99 mm) lead spacing The OPB120 through OPB123 devices consist of an infrared emitting diode and a Photologic® sensor (which is a monolithic integrated circuit that incorporates a linear amplifier and a Schmitt Trigger). The OPB120 series have an LED and Photologic® sensor mounted on opposite sides of a 0.080” (2.03 mm) wide gap.