OPB826SD [TT Electronics]

OPB822 uses side-by-side mounting configuration, while OPB826 uses over/under mounting configuration. OPB822S has 0.01” by 0.04” (0.25 mm x 1.02 mm) apertures in front of both phototransistors, OPB822SD has apertures in front of both phototransistors and both emitters. OPB826S has 0.04” by 0.04” (1.02 mm x 1.02 mm) apertures in front of both phototransistors, OPB826SD has apertures in front of both phototransistors and both emitters. Dual channels enable direction of travel sensing. The low-cost plastic housing reduces interference from ambient light and provides protection from dust and dirt. Phototransistor switching occurs when an opaque object passes through the device slot.