BZX79-B12,133

Diodes - Zener - Single: BZX79-B12,133 Application Field and Working Principle

The BZX79-B12,133 is a small signal silicon planar Zener diode composed of a semiconductor material joined between two terminals for conducting current. These diodes are specifically designed to utilize the Reverse Breakdown property of the diode to allow the diode to act as a voltage regulator or voltage reference. In the category of diodes, the BZX79-B12,133 belongs to the category of Zener diodes.

Principle of Operation

A Zener diode is a special type of diode which allows current to pass through it in either a forward or reverse direction. When forward bias is applied, the diode acts as a regular diode, allowing current to pass through it. However, when reversed bias is applied, the diode can enter a state called the reverse breakdown region where the diode suddenly experiences a sharp rise in current. This leads to the diode becoming a voltage regulator by “breaking down” at a predetermined reverse voltage.

The BZX79-B12,133 Zener diode is specifically designed to have a zener voltage of 12.133 volts. This value is the amount of reverse voltage the device will regulate at. When reverse voltage is applied and it exceeds the zener voltage, the diode enters its breakdown region, limiting the amount of voltage applied to 12.133 volts.

Applications

The BZX79-B12,133 is mainly used in applications that require a stable, predictable voltage. It is often used in voltage references, voltage regulators, or as part of amplifiers and oscillators. It can also be used in series with the load to protect the load from higher voltages. Other common uses for Zener diodes are limiting voltage spikes or providing reverse polarity protection.

Conclusion

The BZX79-B12,133 is a small signal silicon planar Zener diode which is mainly used for voltage regulation or voltage references in applications that require a consistent and accurate source of voltage. It is available in both unidirectional and bidirectional types and is generally used in series with the load to provide protection. There are many other applications where the BZX79-B12,133 could be used, however, it is important to ensure the diode can handle the current and voltage conditions in the application.