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ISO7341-Q1: VI value under DC characteristics

Part Number: ISO7341-Q1
Other Parts Discussed in Thread: ISO7741, ISO7041, ISO7741-Q1

I want to use ISO7341CQDWRQ1. In the data sheet, I only know the VI value under AC characteristics;
However, the VI value under DC characteristics is not found. For example, when ISO7341C-Q1 does not transmit data, the input state of the chip is often low / high, and what is the current consumption value.

  • Hi Meng,

    Thank you for posting to E2E!

    I apologize for the confusion, but supply current consumption for DC input voltages are specified for ISO7341-Q1, as shown below:

    These DC current consumption values are the same regardless of the ISO7341's input state and default output because, unlike ISO7741, this device uses edge-based transmission across the isolation barrier instead of on-off modulation. For both DC input cases, data is continuously transmitted.

    Is it possible for you to use the ISO7741-Q1 instead of ISO7341-Q1? This is our most robust device for most applications and exceeds many performance abilities of ISO7341-Q1. If automotive (Q1) rating is not critical, the ISO7041 also offers significantly lower current consumption specs.

    Please let me know if this is helpful.

    Thank you,
    Manuel Chavez

  • The data sheet of the competitor SI8641ED-AS2 (Silicon labs) indicates the VI values under two test conditions.

  • Hi Meng,

    ISO7341-Q1 specifications include both DC VI conditions in the parameter I showed above. Current consumption is the same in both DC VI conditions for this device.

    Since Si8641 has a different method to transmit data across the device's isolation barrier, current consumption varies based on the DC input state. This is not the same as ISO7341-Q1.

    If you are looking for a device which has an internal architecture like Si8641, ISO7741-Q1 is specified as shown below:

    Thank you,
    Manuel Chavez