A diode is a two-way electronic component that allows the electric current to flow through it in one direction. 1 This term is used to refer to the semiconductor diode, the most common at present; Consists of a piece of semiconductor crystal connected to two electrical terminals. The vacuum diode (which is no longer used, except for high power technologies) is a vacuum tube with two electrodes: a lamina as an anode, and a cathode. Find list of some of the best and quality providing manufacturers, private dealers, whole sellers and vendors of diodes who can deliver you the best quality from different cities and countries of the world.