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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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What is the CTR classification by rank?

transistor coupler TLP385 the rank classification

The current transfer ratio (CTR) of transistor couplers appear as a multiplication of main three factors which are the degree of LED light emission, light sensitivity of the photodetector device and degree of amplification by the device, and degree of optical coupling when LED chip and photodetector chip are placed in a three-dimensional environment. Each factor has manufacture variations, and as a result, the CTR value shows widely distributed variations. From a practical viewpoint, Toshiba thus provides these by classifying them into several types. For example, for Toshiba's typical transistor coupler TLP385, the rank classification in the following table is set.