29. Reverse Polarity Protection Diode

Neha is designing a 12V DC input circuit for an industrial control board. 

To protect the board if the power supply is connected in reverse polarity, she adds a diode in series with the input line. 

The board can draw up to 500 mA current, and she wants an SMD diode in SMA package. 

Because the diode is in series with the input, it should have low forward voltage drop, ideally around 0.5V or less, so the board does not lose too much voltage and power. 

Help her select a suitable diode from DigiKey. 

Make sure it can safely handle the input current, has enough reverse voltage rating, and gives low forward voltage drop for efficient operation.