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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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A photocoupler is an isolation device. What is dielectric strength, which indicates its insulation capability?
Dielectric strength is a voltage defining the amount of dielectric withstand voltage between input and output. For component standards applicable to photocouplers, the UL standards in the U.S. and the VDE standards in Germany have completely different definitions of test methods for measuring input-output insulation performance and of acceptance criteria.
For details, also refer to Toshiba Application Note "Safety Standards for Photocouplers", Chapter 3. Safety standards.
(https://toshiba.semicon-storage.com/ap-en/design-support/document/application-note.html)
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