* The ITR9608-F consist of an infrared emitting diode and an NPN silicon phototransistor, encased side-by-side on converging optical axis in a black thermoplastic housing, ․The phototransistor receives radiation from the IRED only .This is the normal situation.

* But when an object is in between , phototransistor could not receives the radiation.

* For additional component information , please refer to IR928-6C and PT928-6C