Tape & Reel (TR) is used to protect the photodiodes from damage. A safety package containing the photodiodes is provided for their protection. When the photodiodes are reverse-biased, the voltage should never exceed 32V. A photodiode has a pin number of 2. There was the possibility that photodiodes in a circuit would emit 150mW heat. The reverse anode voltage for the photodiodes should be 32V. In general, the maximum heat generated by photodiodes should be 150mW in a circuit. With the reverse voltage of 32V, the photodiodes in the DC circuit can work properly. The current in a photodiode is 5nA even when there is no light input.