Z4KE180A-E3/73

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The Z4KE180A-E3/73 is a single Zener diode and is part of a large family of Zener-diodes that offer good price/performance equivalents. It features a low voltage of 18 volts, a 400mW power dissipation, a reverse polarity protection, and a 2.5% tolerance of the Zener voltage.

Application Field

The Z4KE180A-E3/73 diode is ideal for many applications such as stabilizing voltage levels or switching with a low voltage. It is suitable for use in a large variety of circuits, from power supplies to audio amplifiers. It can be used to maintain a constant voltage at a given current level thanks to its negative temperature coefficient. It can also provide protection from electrostatic discharge, provide voltage regulation and help prevent load surges and reverse currents. Zener diodes are usually used to effectively control the current flow in circuits, reduce loss from switching and provide high levels of circuit stability.

Working Principle

The working principle of a Zener diode is based on a reverse bias operation, meaning the anode is at a lower potential than the cathode. This allows smaller current flows than those found in a forward bias operation, as the electric field in the reverse bias extends over the bulk of the silicon material in the junction. When an appropriate reverse voltage is connected to the Zener diode, it will let a majority of the electric current flow through the diode. At the same time, a majority of the reverse voltage is dropped across the diode\'s junction.

The Zener voltage Vz can then be calculated by multiplying the current I* by the resistance of the diode R. This Vz value is the voltage at which the Zener diode starts to conduct current. The Zener diode (or, Zener junction) behaves like an ideal voltage source and maintains a nearly constant voltage across it, regardless of the amount of current flowing through it. This voltage source is often called a Zener reference.

Furthermore, the Zener diode\'s current carrying capabilities are also affected by its temperature coefficient and its tolerance of the Zener voltage. Since the forward currents vary significantly with the temperature, and the Zener voltage has some degree of tolerance on the voltage level, it is important to allow the Zener diode to be capable of carrying larger forward currents over the temperature range of operation.

Overall, the Z4KE180A-E3/73 diode is a reliable, cost-effective and versatile component that is suitable for many circuits and applications. Its negative temperature coefficient and 2.5% Zener voltage tolerance make it an ideal device for voltage stabilization, reverse polarity protection, and protection from electrostatic discharge, among many other uses.

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