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Diodes - Zener - Single: BZY55B20 RYG application field and working principle

The BZY55B20 RYG Zener Diode is a single diode device that is designed to regulate voltage levels and provide protection against electrical transients. It has a wide range of uses in various applications, from the most demanding power systems to the most delicate monitoring and automotive systems. This page will provide an overview of the working principle and the application field of this type of device.

Working Principle

The working principle of the BZY55B20 RYG Zener Diode is based on the “Zener effect”, which is the breakdown of the diode due to electric field stress. When the breakdown threshold of the diode is exceeded, electric current will propagate through the junction, thus regulating voltage levels and eliminating the electric transient.

The BZY55B20 RYG Zener diode consists of two terminals, the anode (positive) and the cathode (negative). Electrons coming from the negative terminal get attracted to the anode and pass through the junction between them. The electrons leave the anode and effectively form a closed loop.

The current and voltage following the closed loop are regulated by the size and shape of the semiconductor junction. As the electric field of the diode increases, the current and voltage it can sustain decreases; hence, currents passing through the terminals of the diode are limited to values within an acceptable range (the so-called Zener level).

The diode must be pre-conditioned with a voltage before it can start to Zener. This can be done by applying a reverse voltage to the diode until it reaches its breakdown threshold, at which point it will start to regulate the voltage and current levels.

Application Field

The BZY55B20 RYG Zener diode can be used in a wide range of applications. It can be used to regulate and protect power circuits, such as in voltage regulators, overvoltage protection circuits, impulse noise suppression circuits, and short-circuits. It is also used in automotive systems, including spark suppression, light dimming, and alternator regulation.

The diode also finds its usage in monitoring circuits, where it can be used to limit the changing of an input signal while still validating it. This is useful in telecommunications, where voltages are high and transients need to be eliminated. Additionally, it can be used to protect sensitive electronics and components visible in many analog and digital circuits.

Finally, Zener diodes can be found in a variety of consumer electronics, including TVs, radios, and other low-voltage devices. It is used to protect the circuit from over-voltage or any electric spikes coming from the power grid. It also prevents malfunctioning of the device by regulating the current flowing in the circuit.

Conclusion

The BZY55B20 RYG Zener diode is a widely used device due to its simple working principle and wide range of applications. It can be found in power systems, automotive systems, and consumer electronics, providing protection and regulation. The diode must be pre-conditioned with a voltage before it can start to Zener, which can be done by applying a reverse voltage to the diode until its breakdown threshold is reached.

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