Reply to post: Re: USB bricker?

Between you, me and that dodgy-looking USB: A little bit of paranoia never hurt anyone

Duncan Macdonald Silver badge

Re: USB bricker?

That is why I was saying zener diodes - a typical USB bricker sends a high voltage negative pulse down the data lines. Because of the small space in a typical USB key the actual energy is unlikely to exceed one joule per pulse. For a negative pulse a protective zener diode will be forward biased and will easily clamp the voltage to under one volt without being strained. (A discrete zener diode is a lot less fragile than a sub 1 micrometer transistor in an integrated circuit.)

(For a positive pulse a 5.5v zener will clamp the spike voltage to under 6v which is still low enough to protect the ICs.)

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