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ISO1640: Is it possible operate on VCC2 is 1.8V?

Part Number: ISO1640


VCC2 voltage went down due to changes in customer specifications.

Is i2c communication possible with the following specifications?

VCC1=5V / VCC2=1.8V

If it doesn't work, is there any part available on VCC2=1.8V?


  • Hi David,

    Thanks for reaching out and for your interest in ISO1640.
    Unfortunately, ISO1640 doesn't support 1.8V operation either at VCC1 or VCC2. Hence, ISO1640 cannot be used with VCC2 = 1.8V.

    We do not have any other I2C isolator that supports 1.8V operation. An alternative to this would be to use a bidirectional level translator between the ISO1640 and 1.8V device. For bidirectional level translator suggestion, please post this question on the Logic forum (link below) and mention an example TI level translator to auto send a notification the right team. Thanks.

    Koteshwar Rao