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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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For a photocoupler and photorelay incorporating a LED device, in designing equipment, which should be considered: LED life or photodetector life?

 In a photocoupler, deterioration over time of the LED rather than the photodetector is dominant. The optical output of the LED deteriorates as the length of time the LED emits light increases. Therefore, by using data on the deterioration over time of the LED in use, the optical output reduction rate is estimated. In designing circuits, the rate of change of optical output is calculated from the usage environment for the set to be used, and the total light-emitting time, and reflected in the initial value for the LED initial forward current (IF).
For details, also refer to Toshiba Application Note "Basic Characteristics and Application Circuit Design of Transistor Couplers", section 2-4 Design Example for Interface Circuit Using Transistor Coupler.