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ISOM8110: Comparison with photocouplers

Shuji Ishiwata
Mastermind 6755 points
Part Number: ISOM8110
Other Parts Discussed in Thread: ISO7810, ISO7710

Tool/software:

Hi All,


I have a question about ISOM811x.
I understand that one of the advantages is that it consumes less current than a photocoupler.
Are there any documents that compare the current consumption between a photocoupler and the ISOM811x?


Best Regards,
Ishiwata

  • 0
    Guru 287690 points

    The ISOM811x devices are designed to be compatible with photocouplers. If you are using them in circuits that were designed for photocouplers, then the power consumption will be the same, i.e., the input (LED) current and the output current will be the same.

    Compared to a photocoupler, the ISOM811x has tighter CTR specifications and no CTR degradation over time, so in a circuit that is using the ISOM811x, you can reduce the input current to get the same performance.

  • 0 in reply to Clemens Ladisch
    Mastermind 6755 points

    Thank you for your reply.

    I understand that the current consumption of the device will be the same as that of a photocoupler,
    but because the CTR does not decrease with age,
    the efficiency is superior to that of a photocoupler when the same current is passed through it.
    Thank you.

    I also have an additional question. A customer is considering replacing a photocoupler from another company with an isolation IC from TI.
    Since they are replacing a photocoupler, I understand that ISOM811x is optimal.
    The customer thinks that ISO7810 would be fine if isolation is required.
    I understand that ISO7810 and ISOM811x use similar isolation methods, but please tell me the difference between them.

    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    Guru 287690 points

    The ISO7810 (like other digital isolators) requires power supplies on both sides, and works only with digital signals, but allows much higher speeds.

    You would use an ISOMxxx device when you do not want to change the circuit, or when you need to isolate an analog signal (e.g., the feedback signal in a power supply), or when you like its price.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 22805 points

    Hello Ishiwata, 

    What Clemens has said it correct. I would like to mention that we recommend ISO7710 or ISO6710 which are newer isolators that feature better performance.

    Best,
    Andrew

  • 0 in reply to Andrew J
    Mastermind 6755 points

    Hi Clemens and Andrew,


    Thanks for your reply.
    I understand.

    Thank you very much.


    Best Regards,
    Ishiwata