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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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For IC couplers, some products are defined with a threshold input current, and others are defined with a current transfer ratio. What is the difference between them?

Many IC couplers consist of a photodiode and a photodetector IC incorporating an amplifier circuit and waveform shaping circuit. When input LED current IF reaches or exceeds a certain value, these products operate logically with the output being inverted. The threshold value for the input current required for inverting the output is called the "threshold input current" and denoted by such symbols as IFHL and IFLH. However, some products consist of a photodiode and a photodetector IC in a very simple configuration with transistors only. In this case, the product operates in such a way that the output current changes as input LED current IF changes, and has no threshold. Like general-purpose transistor couplers, this type of product is defined with the current transfer ratio (CTR).

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