ROHM FAQ

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FAQ's
  • Please notify us of any abnormal conditions during circuit design. 
    • Please refer to the next item during circuit design.
      A
      ·The operating current of the infrared diode will differ based on the application, making it necessary to select the appropriate load resistance for the phototransistor. If the proper load resistance is not used the circuit will not operate.

      ·Simulation using the upper and lower limits of the emission strength. A value roughly between the maximum dark current and threshold voltage exists.

      ·Based on this during load resistance selection [Data 1] will be displayed. Verification should be performed during the design stage. If no lighting occurs please inquire for further information.

      B
      Please note that when using 2 or more in series the resistance of the infrared diodes will become common and differences in VF may result in abnormal operation.

      Please refer to the calculations below
      • Products: Optical Sensors