PLZ20C-HG3/H

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The PLZ20C-HG3/H is a single in-line package (SIP), zinc oxide semiconductor diode with a maximum operating voltage of 20 volts, available in a hermetically sealed glass package. Its zener voltage can be adjusted between 18.6 and 21.6 volts and is capable of regulating the current to 10 mA when connected with a resistor.

The Zener diode is one of the most common types of diode found on the electrical circuit. The diode is designed to conduct a current as long as it is reversed biased (in the opposite direction of conventional current). When the forward-biased voltage, known as a breakdown voltage, exceeds a certain point, the diode can conduct a current regardless of its polarity, resulting in an exceptionally low voltage drop across the device.

The working principle of Zener diodes can be explained by highlighting their physical structure. Zener diodes consist of two pieces of metal, one negative and one positive. When a forward bias (positive) is applied to the diode, a large electric field is formed between the two electrodes, also known as P-N junction. This field multiplies extensively near the junction impeding the current flow across the diode. When the voltage generated by the electric field exceeds a certain threshold, known as the breakdown voltage, the diode begins to conduct a current through the Zener region, which is a microscopic area at the P-N junction.

The PLZ20C-HG3/H is a versatile device, commonly used for a variety of applications including voltage regulation, voltage protection, voltage clamps, supply of reference voltages, and a variety of AC and DC circuit protection. It can also be used in low-noise audio pre-amplifiers, where it is used to limit the supply voltage, ensuring that the voltage does not exceed the maximum limit for the configurations of the circuit.

This diode is most commonly used in linear regulating applications, where it is placed in parallel or series with a resistor to limit voltage or current. The combination of the diode and the resistor act together to regulate the output voltage. In series, the diode and the regulator form a voltage divider, limiting the output voltage to a certain level. Conversely, when connected in parallel, the diode and resistor act together to form a shunt regulator, limiting the output current.

The Zener diode can also be used in combination with diodes connected back-to-back with a capacitor to form a clamping circuit, which is used to reject voltage spikes and protect sensitive electronic circuits. The diode along with the capacitor will clamp the transient voltage to a predetermined level and limit the voltage applied to the circuit device.

In short, the PLZ20C-HG3/H is a widely used, versatile device, seen in a host of applications for voltage regulating, voltage protection, voltage clamping, referencing voltage source, AC/DC protection and low-noise audio pre-amplifiers. Its usage is also growing as more and more applications require efficient, high-performance components.

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