MMBZ5250C-HE3-18

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The MMBZ5250C-HE3-18 is a single zener diode designed for applications such as voltage reference and emergency overload protection. The diode is packaged in the SOT-23 package, allowing for easy and efficient mounting on circuit boards. In this article, we will explore the application field and working principle of the MMBZ5250C-HE3-18.

Application Field

For starters, the MMBZ5250C-HE3-18 is most commonly used as a voltage reference. This is because the device provides a relatively stable voltage despite changes in current or temperature. As a voltage reference, it is often used in variety of power supply designs, such as linear and switch converters, and to regulate standby power supply currents. Additionally, it can be used as a voltage source in measurement and control circuits, as the reference voltage will remain the same even when the temperature or the current in the circuit changes.Apart from being used as a voltage reference, the MMBZ5250C-HE3-18 can also be used as an emergency overload protection. It has the ability to limit inrush currents and prevent circuit damage that may be caused by sudden surges of current. The diode is usually placed in parallel with the voltage supply and will act as a current limiter when the voltage across it reaches the predetermined zener voltage. This helps to protect sensitive electronics from unexpected and damaging overloads.

Working Principle

The MMBZ5250C-HE3-18 works on a principle known as the Zener effect. The Zener effect occurs when the electric field within a diode is strong enough to cause current carriers to cross the forbidden energy gap in the PN junction. This results in the formation of a depletion zone and an increased reverse-bias current. The increased reverse-bias current causes the voltage supply to be clamped to a set voltage, which is determined by the Zener voltage of the diode.When the Zener diode is used as a voltage reference, it is connected in reverse bias, with the cathode at a higher potential than the anode. In this configuration, the Zener diode operates just like an ordinary diode and will not conduct until the breakdown voltage is reached. When the breakdown voltage is exceeded, the Zener diode will begin to conduct. The voltage drop across the device will be the same as the Zener voltage, which allows it to provide a constant voltage reference. The breakdown voltage will remain constant until the supply or current changes.When the MMBZ5250C-HE3-18 is used as an overload protection device, it is connected in series with the voltage supply. In this configuration, the diode operates in a similar manner to when it is used as a voltage reference. However, when the voltage across the diode exceeds the Zener voltage, it will begin to conduct, causing the current to be clamped to a safe level. This limits the amount of current flowing through the circuit and prevents the circuit from being damaged.

Conclusion

The MMBZ5250C-HE3-18 is an extremely versatile device, capable of being used for both voltage reference and overload protection. The device is designed around the Zener effect principle and has the ability to provide a stable voltage reference, even when the supply or current in the circuit changes. The device can also be used to protect circuits against sudden overloads, as it is able to limit the current flowing through the circuit to a safe level.

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