The OPB365T55 is a Slotted Optical Switch with plastic discrete shell and PC mountable leads. The phototransistor output slotted optical switch provides the design engineer with the flexibility of a custom device from a standard product line. Building from a standard housing with a 0.125-inch wide slot. Discrete shells (exposed on the parallel faces inside the device throat) are either IR transmissive plastic for applications where aperture contamination may occur or opaque plastic with aperture openings for maximum protection against ambient light.