1N5408 1W Diode

A diode is a device that allows current flow through only one direction. That is the current should always flow from the Anode to the cathode. The cathode terminal can be identified by using a grey bar as shown in the picture above.

The b is called a power diode because of its high forward current and reverse voltage with a power dissipation of 6.25W. For 1N5408 Diode, the maximum current carrying capacity is 3A it withstands peaks up to 200A. Hence we can use this in circuits that are designed for less than 3A. The reverse current is 10uA which is negligible. These diodes have a slow recovery time so in modern electronics, it is being replaced by other advanced diodes.

Applications of Diode
Can be used to prevent reverse polarity problem
HV supplies
Half Wave and Full Wave rectifiers
Used as a protection device
Current flow regulators