A brief discussion on the electrodes and symbols of diodes

Infineon / Mitsubishi / Fuji / Semikron / Eupec / IXYS

A brief discussion on the electrodes and symbols of diodes

Posted Date: 2024-02-08

Giving a reverse voltage to the PN junction will make the depletion layer thicker, thus hindering the replenishment of electrons. In this state, the applied voltage cannot allow current to flow. If a forward voltage is given to the PN junction, the amplitude of the depletion layer becomes narrower, and the holes in the P region and the electrons in the N region can move freely. As long as the voltage is slightly increased, a very large current can be formed.

The diode is composed of a PN junction plus corresponding electrode leads and a tube package. The coupling part of the diode is made of germanium, silicon, etc. The diode has two electrodes. The electrode drawn from the P area is the positive electrode, also called the anode; the electrode drawn from the N area is the negative electrode, also called the cathode.

The diode symbol is as shown in the figure: the direction of the triangular arrow indicates the direction of the forward current, and the current direction is consistent with the direction of the arrow. The text symbol of the diode is represented by VD.

Other types of diode symbols represent:

Review Editor: Huang Fei

#discussion #electrodes #symbols #diodes