16. Diode Selection

Question.6

An ESD protection diode DESD5V0S1BA-7 (DigiKey part number) is used to protect a 12 V power line coming from an external connector. The diode fails immediately when power is applied.

By referring to the component datasheet, what is the main reason this design is incorrect?

The diode is too slow to respond to voltage changes
The diode is designed only for very short ESD events, not normal power lines
The diode’s voltage rating is meant for 5 V signals, not a 12 V rail
The diode should have been connected in series instead of to ground

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