This part is an infrared detector manufactured by Kemet. It has a 4.55 micrometer (um) bandpass analog. It is designed to work with USeqFCSA455100 series infrared emitters. It is an unlocked detector for low power applications. The spectral response of the detector is designed to match the wavelength of the associated emitter and provides a high signal-to-noise ratio. The detector has a wide range of uses including medical, industrial, scientific, and consumer applications. It can be used for measuring temperature, radiation, infrared light pollution, and motion detection.