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ISOM8710: The distance from the emitter through the insulator to the receiver

Conor
Mastermind 8120 points
Part Number: ISOM8710
Other Parts Discussed in Thread: ISOM8711,

Hi, 

I have a question about the ISOM8710 and ISOM8711 high-speed photo emulators.

Can you tell me the distance from the emitter through the insulator to the receiver?

Thanks,

Conor

  • 0
    TI__Genius 14090 points

    Hello Conor,

    Thank you for your question. The distance through insulation of the ISOM8710 and ISOM8711 is >17μm. 

    Regards,
    Darrah

  • 0 in reply to Darrah Merillat
    Mastermind 8120 points

    Hi, Darrah

    Since the internal input/output distance of the photocoupler must be 1.5mm or more, 17μm does not satisfy the standard. Do you have any alternatives?

    Thanks,

    Conor

  • 0 in reply to Conor
    TI__Genius 14090 points

    Hi Conor,

    The ISOM8710 and ISOM8711 use a newer isolation technology including a stronger dielectric insulation material that does not require as large of a distance to achieve isolation. Traditional opto-couplers use an LED and photo diode that are separated by either air or a weak dielectric material like epoxy. For reference, air has a dielectric constant of 1V/μm and epoxy has a constant of 20V/μm. These materials can age and deteriorate over time so a larger distance through insulation (DTI) is needed to ensure high isolation values.

    However, the ISOM8710 and ISOM8711 use a high-quality dielectric material that does not need to be as thick to achieve high isolation values. The silicon dioxide (SiO2) in the opto-emulators has a dielectric constant of 500V/μm. For more information on how our opto-emulators meet the DTI certification requirements, please see the white paper: Distance Through Insulation: How Digital Isolators Meet Certification Requirements

    Regards,
    Darrah