PLZ22C-HG3/H Discrete Semiconductor Products

Diodes - Zener - Single

The PLZ22C-HG3/H is a single Zener diode, a widely used type of diode that acts as a voltage regulator. It is made of a semiconductor material, most commonly silicon, and is used to protect circuits from spikes in voltage, often from power sources. When the voltage in a circuit is greater than a specified level, the diode breaks down, reducing the voltage back to a safe level.

Application Field

The PLZ22C-HG3/H is mainly used to provide overvoltage protection for circuits which must operate in harsh environments, presenting an inexpensive and reliable way of keeping the voltage at a safe operating level. Some of the applications in which it can be used include:

• Power supply circuits in PCs, televisions and other electronics
• Electronic circuits in automobiles
• Telecommunication systems
• Industrial machinery

Working Principle

When the voltage in a circuit is greater than the breakdown voltage of the diode, the diode begins to conduct. This process is known as avalanche breakdown, and it allows the diode to conduct a continuous current even though the voltage across it is greater than the breakdown voltage. Since the voltage is greater than the breakdown voltage, a potential difference is established between the anode and cathode of the diode, resulting in a current that is proportional to the voltage difference. As the voltage drops below the breakdown voltage, the current drops as well.

The voltage at which this breakdown occurs is known as the Zener voltage and is typically specified in the datasheet. In the case of the PLZ22C-HG3/H, the Zener voltage is 28V. This voltage stays relatively constant for a wide range of current, allowing the diode to act as a voltage regulator.

In addition to its voltage regulating functions, the PLZ22C-HG3/H is also capable of efficiently conducting reverse currents, which can be used in ESD protection and other applications where transient protection is necessary. Overall, the PLZ22C-HG3/H is an effective and reliable single Zener diode, ideal for use in applications where voltage regulation is a priority.