1N4921

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The 1N4921 is a single-diode Zener with a working voltage of 5.6V. Depending on the application, the 1N4921 can be used in both linear and switching mode.

Application Field of 1N4921

The 1N4921 is used as a Zener diode for overvoltage protection. It is designed for direct mounting on printed circuit boards. Thanks to its low operating temperature, it is also suitable for temperature-critical applications. The high current carrying capacity of the 1N4921 enables it to be used in both linear and switching-mode power supplies. Additionally, it is an ideal choice for use in current sensing applications.

Working Principle of 1N4921

The 1N4921 is a single-diode Zener, with a reverse breakdown voltage of 5.6V. It exhibits a high inverse voltage and low forward voltage drop, allowing current to flow in a forward direction with minimal voltage loss. The high current rating ensures a large power dissipation can be achieved without degradation in performance. Additionally, intermediate values of voltage between 5.6V and 0V are attainable through the use of multiple 1N4921 devices connected in series.

When a current passes through the 1N4921 diode, it experiences a si\multaneous rise of current and voltage due to the forward-biased properties of the diode. This results in a constant voltage drop across the device, with the voltage determined by the reverse breakdown voltage of the diode. This process of maintaining a constant voltage is known as Zener-impedance, and it allows the device to provide protection against overvoltage.

Moreover, the 1N4921 is a great choice for applications that require a low operating temperature. The breakdown voltage of the device does not change significantly with increasing temperature, ensuring its reliability for temperature-critical applications. The device also features robust construction that ensures it can withstand physical impacts and withstand harsh operating environments.

The 1N4921 is also well-suited for current sensing applications. A current passes through the diode, and its voltage drop is measured to determine the current through it. As the voltage drop is directly proportional to the current, the 1N4921 can be used to accurately measure the current flowing through its terminals.

Conclusion

The 1N4921 is a single-diode Zener, with a reverse breakdown voltage of 5.6V. This device is commonly used in applications where high current carrying capacity, low forward voltage drop, and robust construction is needed. As a Zener diode, it can be used for overvoltage protection and current sensing. Additionally, the 1N4921 is well-suited for temperature-critical applications due to its low operating temperature.

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