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ISOM8110: Comparing Power Consumption between ISOM8110 and TLP183 Optocouplers

DDdoor
Expert 2315 points
Part Number: ISOM8110

Hello,

According to the datasheet of ISOM8110, it is indicated that the device has low power consumption compared to optocouplers.
For instance, when comparing with TLP183 in terms of power consumption, which parameters should be compared?

Best regards,
DDdoor

  • 0
    Guru 285550 points

    In a typical optocoupler circuit, the power consumption is determined not by the optocoupler itself but by external components, i.e., both the (input) LED current and the (output) collector current are limited by resistors. When you replace the TLP183 with the ISOM8110, without other changes, then the power consumption is exactly the same.

    But the ISOM8110 has tighter CTR specifications, and the CTR does not degrade with age. So you will be able to reduce the input current while achieving the same minimum output current.

  • +1 in reply to Clemens Ladisch
    TI__Mastermind 22465 points

    Hello DDoor,

    Clemens is correct. The key here is the second part:

    Clemens Ladisch said:
    But the ISOM8110 has tighter CTR specifications, and the CTR does not degrade with age. So you will be able to reduce the input current while achieving the same minimum output current.

    The CTR in light-based optocouplers degrade over time. The degradation forces designers to use a higher input current to achieve the same output current over the lifetime of the device. The ISOM8110 does will not degrade over its lifetime and therefore has lower current consumption for the applications lifetime.  

    You can read more about the benefits of the ISOM8110 here Opto-emulators explained: Why you should upgrade your optocoupler technology (ti.com).

    Best,
    Andrew