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[FAQ] Can a digital isolator signal voltage be different from its power supply voltage?

Can a digital isolator signal voltage be different from its power supply voltage?

  • The input & output signal voltages of digital isolators are dependent on its applied power supply voltage. Hence, for the digital isolator to be compatible with the devices it is interfaced to, it is recommended to keep signal voltages similar to the isolator power supply voltage. For example, when ISO77xx is powered with 5V and is interfaced to an MCU it is important that the MCU signals are also operating at 5V logic levels.