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Original question:

TIOL111: ±1.2 kV/500 Ω IEC 61000-4-5 Surge

TIOL111: ±1.2 kV/500 Ω IEC 61000-4-5 Surge

Nam, Dino
Expert 6445 points
Part Number: TIOL111

Hello Max, 

Thank you for your support. One more question. 

The modified version of IEC61000-4-5 is Edition 3.0(2014) or Edition3.1(2017)?? I can't find anywhere in the document referring to high serial resistance.

Is it possible to share even picture of the part shown for the high series resistance like below?

The table below is quoted from the TI document " SLVA 711–6.2015

Thank you. 

  • 0
    TI__Guru 62920 points
    Hi Dino,

    Sorry, I wasn't very clear on this. The 500-Ohm series resistance does not show up in the IEC 61000-4-5 specification. Instead, it is defined in the IEC 60947-5-2 for proximity sensors, which references IEC 61000-4-5 and requires systems to withstand a 1-kV impulse (1,2/50 us) with source impedance 500 Ohms. (This is in Section 7.2.3.1 of the standard.)

    Regards,
    Max
  • 0 in reply to Miguel Robertson
    TI__Expert 6445 points
    Hi Max,

    Thank you for your comment. but the customer internal specification of surge is 500V/2-ohm(250A). The 1.2K/500-ohm(2.4A) is not enough to pass their internal specification.
    If the 500 ohm series resistance show up in the IEC61000-4-5 or IEC60947-5-2 specifications is mentioned in IEC61000-4-5 specification, the engineer of customer can persuade their internal quality team. Currently, their quality team don't admit IEC60947-5-2. Please review again and let me know your opinion.

    Thank you.
  • 0 in reply to Nam, Dino
    TI__Guru 62920 points
    Hi Dino,

    If the application requires 2-Ohm surge, unfortunately the 500-Ohm value is not similar enough to be used. Generally when higher surge levels are needed a TVS diode is used in order to further protect the device. In this case the TVS diode would sink the surge currents and clamp the voltage on the line, so the transceiver would just need to withstand the clamped voltage. Since the TIOL111 is designed to handle transient overvoltages up to +/- 65 V, it helps in being able to find a suitable diode (since the peak clamping voltage range does not have to be too narrow).

    Max