16. Diode Selection

Question.5

A designer uses a diode with DigiKey part number 1086-15382-ND as a flyback diode across a 12 V relay coil to protect a transistor. The circuit works initially but fails after repeated switching.

By referring to the component datasheet on the DigiKey website, what is the reason for this failure?

The diode’s reverse voltage rating is too low
The diode switches too fast for relay applications
The diode cannot handle the surge current from the relay coil
The diode should be placed in series, not across the relay

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