BZT55A18-GS18

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

A Zener diode, also known as an avalanche diode, is an electronic component that has two distinct modes of operation. It works as an ordinary diode in the forward bias direction, and in the reverse bias direction it permits large reverse current flows, limited only by the device\'s power handling capability.

The BZT55A18-GS18 is a single Zener diode with a nominal breakdown voltage of 18 volts. It is a glass-passivated, two-terminal, unidirectional device. It is designed to provide a constant, highly-regulated reverse breakdown voltage with a tight dynamic impedance control of 1.5 ohms, allowing better thermal and electrical stability.

The BZT55A18-GS18 is suitable for use in applications such as voltage regulation, temperature compensation and temperature sensing, current limitation, ESD protection, and peak power limiting. It is designed for AC, DC/DC, and DC/AC circuits as well as DC switch mode power supply circuits. It can also be used in low-frequency and RF circuits.

To understand the working principle of the BZT55A18-GS18, we need to look at the behavior of the diode when it is biased in the forward direction. When forward biased, the diode will follow the applied voltage and a small current will flow through the diode. In the reverse direction, the behavior of the diode is different. Instead of obeying the applied voltage, the diode will drop a constant, regulated voltage known as its breakdown voltage. The breakdown voltage of the BZT55A18-GS18 is 18 volts.

The Zener diode achieves its regulated voltage in two ways. First, the diode is designed to act as a rectifier, blocking current flow in one direction. Second, the breakdown voltage is created by a physical phenomenon called Zener breakdown, which is the result of a large electric field within the diode. The electric field causes electrons in the diode to be forced into its junction, creating a region of charge carriers; this extra current flow creates the avalanche breakdown voltage.

For its use in electronic circuits, the reverse breakdown voltage of the BZT55A18-GS18 is used to protect components from any transient spikes or surges in the circuit. It can also be used as a voltage reference or as a replacer to traditional voltage-regulating circuitry or thermistors. In these applications, the device maintains the circuit’s voltage at the 18-volt level and prevents any variation from occurring.

In summary, the BZT55A18-GS18 is a single Zener diode with a nominal breakdown voltage of 18 volts. It is suitable for applications such as voltage regulation, current limitation, ESD protection, and peak power limiting, and works by achieving its regulated voltage in two ways. It acts as a rectifier, blocking current in one direction and then achieves the 18-volt breakdown voltage through a physical phenomenon called Zener breakdown.

The specific data is subject to PDF, and the above content is for reference