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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 is the difference between a dark current and OFF-state collector current?

A leakage current flowing between the collector and emitter of the transistor at the output side of a transistor coupler is defined as Dark Current ICEO(IDARK). In this case, a current is not passed to the LED at the input side.
On the other hand, a leakage current flowing between the collector and emitter of the transistor at the output side when a low voltage (In Toshiba's case, VF=0.7V) is applied to the LED at the input side, though it is the OFF area, is defined as OFF-state Collector Current IC (off). This means that the OFF-state voltage at the input side is at a level below 0.7V.

Dark Current ICEO(IDARK) 
Dark Current ICEO(IDARK)
OFF-state Collector Voltage IC(off)
OFF-state Collector Current IC(off)
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