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Original question:

Electrostatic discharge: Human Body Model versus IEC61000-4-2

Human Body Model versus IEC61000-4-2

Barry Rowland
Intellectual 550 points
Other Parts Discussed in Thread: STRIKE

HBM specification requires only a single + and single - event. When TI uses an HBM rating in a data sheet, does that imply that the device may fail after a second ESD strike at the kV rating in the data sheet?  If so, is there any guidance as to what is an 'acceptable' repetitive ESD strike during handling or operation? Does TI provide ESD ratings to the IEC 61000-4-2 standard on some devices?

Thanks

  • 0
    TI__Genius 12410 points
    Barry,
    You are correct that it could cause damage if a typical IC was striked repeatedly. Because the ESD cell varies widely from part to part there is no rule of thumb that can show that all devices will pass this number of ESD strikes.
    TI has a multitude of parts that are tested to the IEC 61000-4-2 rating. You can find it in the datasheet under the ESD rating and more than likely in the description. We also have many discrete ESD devices that can be found in ti.com/esd

    Also if you would like more information about ESD check out our ESD Essentials videos.
    training.ti.com/11-esd-essentials-what-esd
  • 0 in reply to Cameron Phillips
    Intellectual 550 points

    Cameron, thanks;

    I understand that the ESD protection will vary across devices ;-), and I have watched the series, and I do have some ASIC design background.

    I'm going to make a guess that a 2 kV HBM device, if exposed several times to 1 kV HBM, is likely to be pretty safe, or it would certainly not be qualified to 2 kV, especially with process and measurement 'guard bands' in the spec ;-)

    Not suggesting that I would want to do this to any device going to a customer, for example, but could use fast pulses to investigate device and application PCB characteristics, since looking at the IV 'shape' during a fast, well-defined pulse waveform can give a lot of data about parasitics and impedances in the signal path to the device pad/pin, I think, maybe...

    Indeed, I'm sure that TI has a lot of devices designed not just to withstand, but to protect against the 61000-4-2 type hits. It's interesting that one needs rather big bandwidth in a scope, to see this 61000-4-2 waveform with any kind of fidelity; given a 1 ns risetime, looks like one should have 6-8 GHz scope AND probing combined BW ... it's funny how 'innocent' 3 dB sounds, compared to the "voltage reality", since a 3 GHz bandwidth will still attenuate the pulse peak by about 30%, I think.

    Might be interesting to do a 'scan' of a device's ESB behaviour, starting at 500 V HBM, and stepping up until it exceeds max current, or fails leakage, post-shot... always something interesting to do, in this world!

    Have a fine weekend!

    BR