I was looking for an Op Amp input protection circuit and the most common I found looks like this.
When the voltage at
Input Signal goes above/below Op-Amp's supply rails schottkey diodes start to conduct.
Let's assume a +100V is applied at
A current equal to
I = (100V - (+15V) - 0.7V) / 5kΩ = 16.86mA will flow from the upper diode to positive supply rail.
The question is, how dangerous is that current flowing to supply rails therefore to the circuit power supply? Would it cause damage to power supply if that amount of voltage is permanent and not transient?