11. PPTC Characteristics & Behavior

Question.2

John powers an Arduino from USB.
Accidentally, the 5V pin is shorted to GND for a moment.
After removing the short, the Arduino does not power up via USB for 10 to 20 seconds.
However, after some time, it starts working again. Why?

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The USB port ESD protection- needs time to reset (few seconds)
PPTC resettable fuse needs time to cool down and return to low resistance
The TVS diode near USB stays shorted for a few seconds to few minutes after a spike
The board capacitor takes time recharge slowly, so power comes back late