The HOA1180 series consists of an infrared emitting diode and an NPN silicon phototransistor (HOA1180- 001, - 002) or photodarlington (HOA1180- 003), encased side- by- side on converging optical axes in a black thermoplastic housing. The detector responds to radiation from the IRED only when a reflective object passes within its field of view. The HOA1180 series employs metal can packaged components. For additional component information see SE1450, SD1440, and SD1410.