A Zener diode is the simplest known type of voltage limiter (Figure 1) As soon as the voltage exceeds the rated voltage of the Zener diode, a current can flow through the diode to limit the voltage.

In this article, we will explore the basic functions of the Zener Diode. This device resembles a compact cylinder, much like the conventional diode, with two terminals at the ends that can be wired or ...