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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.
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What precautions should be taken when using triac couplers for a long time?
When LED is energized continuously for a long time, its optical output degrades gradually. Owing to the above, trigger LED current IFT becomes greater than its initial value. By using data on LED deterioration over time, the initial value for IF must be set so that even after the designed time elapses, it exceeds the value for IFT(Max).
For details, also refer to Toshiba Application Note "Triac couplers-basic properties and application design", section 9.1 How to design the input-side LED current IF.
(https://toshiba.semicon-storage.com/ap-en/semiconductor/knowledge/application-note.html)