BZY55B18 RYG

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BZY55B18 RYG application field and working principle

Zener diode or Zener breakdown diode is a type of diode specifically designed to make this reverse conduction so that breakdown occurs at a predetermined reverse voltage (Zener voltage), which is determined by the Zener diode type. Zener diode is designed to break down at a predetermined voltage, usually with no more than 5 volts difference. When a positive voltage is applied to it, it behaves exactly like a conventional diode and does not conduct until the positive voltage reaches the forward-bias voltage (breakover) needed for the junction. However, when the voltage becomes negative and reaches the reverse-bias voltage (breakdown) needed for the junction to breakdown, the diode conducts in the reverse direction. This means that the Zener diode’s reverse-bias breakdown voltage can be accurately predetermined during the design process.

The BZY55B18 RYG is a single Zenar type diode with a breakdown voltage of 18V. It is packaged in a SOD323 SOT-23 packages and features a low forward voltage of 0.35V (at If=10mA) and high speed switching. It can be used for various purposes such as circuit protection, voltage regulation, and noise suppression. It is also used in applications where small size and low power consumption are required.

The working principle of the BZY55B18 RYG diode is as follows. When the anode is applied with a positive voltage, the overvoltage is limited and a certain amount of current flows through the diode. As the anode become more positive, the current flowing through the diode increases. When the reverse voltage is applied across the diode, the voltage rises until a certain point. At this point, known as the Zener voltage, the diode avalanche and the current rising sharply. This avalanche current is limited by the addition of a resistor in series with the diode.

In conclusion, the BZY55B18 RYG diode is designed for applications that require a low-voltage breakdown and a small size. It features low forward voltage, high speed switching, and low power consumption, making it suitable for various applications, such as circuit protection, voltage regulation, and noise suppression.

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