MMBZ5255B-G3-18

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The MMBZ5255B-G3-18 is a single Zener diode, a semiconductor device with a reverse breakdown voltage. It is mainly used to control the voltage and current levels. Specifically, it is used to protect sensitive pieces of equipment from over-voltage and over-current conditions, and for voltage regulation and high frequency switching.

A Zener diode functions by allowing the current to flow freely in one direction and blocking it in the opposite direction. When it is reverse biased, the depletion region of the diode is extended and permits a small current to flow. This current is called ‘Zener breakdown current’ and it is used to regulate the voltage. The MMBZ5255B-G3-18 is designed to work as a voltage regulator and hence it has a specified voltage range or ‘knee voltage’.

The knee of the MMBZ5255B-G3-18 is 18V. This diode can operate in a wide temperature range, from -55°C to 150°C. It is rated at 0.5W, with a maximum working current equal to 200mA. The device is provided in a surface-mount Mil-STD-883 qualified package.

The working principle of the MMBZ5255B-G3-18 Zener diode is fairly simple. Initially, the diode is reverse biased with a voltage source and the current is only a few microamperes. When the voltage reaches the Zener breakdown voltage, the current starts to increase exponentially, because the depletion region becomes larger and a larger amount of electrons can flow freely between the electrodes.

When connected across a load, the diode starts to conduct current and the voltage across the diode is maintained at the breakdown voltage, regardless of variations in the input voltage. The Zener diode acts like a three-terminal voltage reference, with an internal voltage regulator. It allows a lower voltage to be dropped across the load, while still having the same output voltage.

The MMBZ5255B-G3-18 is mainly used in consumer electronics, automotive and communication systems, as a voltage regulator. It provides the necessary protection against over-voltage and over-current conditions, while keeping a stable output voltage. Its high temperature rating and small size makes it suitable for many applications.

Overall, the MMBZ5255B-G3-18 is an ideal solution for voltage regulation and high frequency switching applications. Its small size, high breakdown voltage and wide temperature range make it a reliable device for many types of applications. Moreover, its structure allows for a low dropout in the regulated output voltage.

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