Op Amp Reverse-polarity Protection

Op amp Specifications

Sometimes when carelessly hooking up the DC supply voltage to an op amp, you may reverse the polarity of the voltages. Doing so, however, cause result in a zapped op amp IC.

If you feed positive voltage into the negative supply terminal, -Vs, this can potentially destroy the op amp.

The way to counter this if you happen to make this mistake is to place a diode between the negative supply terminal and the negative voltage. This is shown below:

Reverse polarity protection diode in op amp

When you connect a diode in this fashion, if positive voltage is placed on this negative supply terminal, current will not flow, because the diode is reverse-biased. This protects potentially fatal voltage from carrying out its effect if voltage polarities are reversed.

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