PLZ4V3B-HG3/H

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Diodes - Zener - Single: PLZ4V3B-HG3/H Application Field and Working Principle

A Zener diode is a two-terminal device that allows current to flow in only one direction—from an anode (or anode side) to a cathode (or cathode side). The PLZ4V3B-HG3/H is a single Zener diode manufactured by STMicroelectronics, with a reverse breakdown voltage of 4.3V and maximum power dissipation of 500mW. It is available in an axial-leaded, SOT-223 package.

Application Field

The major application fields for the PLZ4V3B-HG3/H Zener diode are voltage regulation and voltage triggering of SCRs. It can be used for voltage regulation since it has a very low dynamic resistance and maximum power dissipation of 500mW. Also, its high stability and low noise make it an ideal component for voltage regulation circuits. The PLZ4V3B-HG3/H diode can also be used as a voltage trigger in SCRs. When the threshold voltage is exceeded, the diode triggers the SCR.

Working Principle

The working principle of the PLZ4V3B-HG3/H Zener diode is the same as typical Zener diodes. Generally, a Zener diode is a p-n junction diode that is specially designed for a reverse breakdown voltage, usually in the range of a few volts. When a reverse voltage is applied to the terminal of the diode, the junction of the diode is configured as a barrier, and electrons will “accumulate” at the boundary of the junction. The accumulation of these electrons acts as a “field limitation” that prevents weak penetration into the barrier when the applied voltage reaches a certain value. At this point, the junction is said to “break down” and current begins to flow in reverse, with a constant voltage drop across the diode (the breakdown voltage).

The PLZ4V3B-HG3/H Zener diode has a reverse breakdown voltage of 4.3V, which means that it can provide a constant current with a voltage drop of 4.3V. This property is essential for voltage regulation and for providing the trigger voltage for SCRs.

Advantages & Disadvantages

The main advantages of the PLZ4V3B-HG3/H Zener diode are its high stability, low noise, and low dynamic resistance. These qualities make it an ideal component for voltage regulation circuits, and its ability to provide a constant voltage drop of 4.3V is perfect for triggering SCRs. However, one disadvantage of this diode is its low power dissipation of 500mW, which limits its usage for high wattage applications.

Conclusion

The PLZ4V3B-HG3/H Zener diode is one of the most common single Zener diodes used today. It has a wide variety of uses, from voltage regulation to triggering SCRs. Its features make it a great choice for many applications. It has a very low dynamic resistance, high stability, low noise, and a maximum power dissipation of 500mW. However, its low power dissipation limits its usage for high wattage applications.

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