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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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How much input current should be passed for switch operation?

The current with the threshold value for input current IF that reverses the state of the output MOSFET to perform output-side operation is defined as "Trigger LED Current IFT". For usage, the driving LED current must be set to a value equal to or greater than "IFT(max)" written in the technical documents. In Toshiba's lineup of products, IFT(max) is 5mA or less. In addition, this IFT may be affected by deterioration over time and other change factors within the ambient temperature range. Consideration must be also given to the coefficients of variation for these factors.
For details, refer to Toshiba Application Note "Photorelay Specifications" Chapter 5. DESIGN CONSIDERATIONS.

(https://toshiba.semicon-storage.com/ap-en/semiconductor/knowledge/application-note.html)

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