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  • What is the difference between luminance and luminous intensity?
    • Luminous intensity refers to the overall brightness, from a lamp LED, for example, without regard to the area of the light source. Luminance indicates the degree of brightness over an area, such as from a display device. The greater the source area the higher the luminance. The luminance is normally obtained by dividing the luminous intensity by the light source area.
  • Is manual soldering possible?
    • Yes, but please be careful to not apply too much mechanical or thermal stress to the leads, which may affect the reliability. Please consult a ROHM representative for unusual cases.
  • Are there any ways to extend the life of LED Numeric Displays ?
    • One of the major factors that influence LED display life is die temperature – the lower the temperature the longer the life. In order to maintain low LED die temperature the following should be heeded:
      • Keep current flow small
      • Minimize ambient temperature
      • Design for sufficient heat dissipation
  • Is it ok to use LED displays outdoors?
    • LED displays in general are not designed to be used outdoors. Adequate moisture treatment, temperature management, UV filtering, salt air protection, and the like should be provided if intended for outdoor use.
  • What are the precautions when conducting flow soldering?
    • LED numeric displays, unlike discrete chip LEDs, are housed in larger packages, making them susceptible to damage during preheating. Therefore, it is recommended that preheating during the soldering process is conducted in such a way to ensure that the internal temperature does not exceed 100C. Also, the preheat time should be shortened.
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