The BCR401R is an infrared emitting diode from Infineon Technologies. It is a surface-mount, 3mm package with a water clear lens and has a peak wavelength of 940nm. This diode emits a highly visible, intense red light and works best with a DC forward current between 50mA and 100mA. The BCR401R is used in a range of applications, such as proximity detection, optical communication systems, smoke detectors, security systems, and medical diagnostic equipment. It is RoHS compliant and has a long life of up to 5,000 hours.