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About information presented in this cross reference

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.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

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Why are there two current transfer ratios: CTR and CTR (Saturation)?

Coupling characteristics

The current transfer ratio (CTR) has LED current IF and transistor collector-emitter voltage VCE dependencies. For typical transistor-output photocouplers, CTR is specified under the conditions IF=5mA and VCE=5V. However, VCE=5V is the condition for the non-saturated area. In applications using photocoulers, ON and OFF digital signals are transmitted very often. In such a case, in the ON state, photocouplers go into the saturated area. Therefore, the saturated condition (In Toshiba's case, VCE=0.4V or 0.3V) may be also set in the CTR requirements, and the CTR under this condition is defined as CTR (Saturation).

Example: Case of transistor-output photocoupler TLP385

IC-VCE characteristics example