1N4908

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

1N4908 is a Zener diode that can be used in a variety of applications due to its wide range of breakdown voltages (1.5 – 41 V). It is a single type diode, thus it contains single p – n junction and it has a majorly reverse bias. In this article, the application field and working principles associated with 1N4908 are discussed in details.

Application Field

1N4908 Zener diode can be used for various functions in different kinds of circuits. Typically, diodes are used as a means for rectifying AC signals, for connecting one circuit to another and for providing a bias voltage to active components. 1N4908 can be used for these usual applications and it can also be used as a voltage regulator in many applications. One of the principal applications of 1N4908 is for regulating and securing the output of a power supply. It is used to provide a steady output voltage and current load capability.

Another application of the 1N4908 is as a voltage reference. A voltage reference is a type of circuit in which the output voltage is held constant even though the input voltage or current may vary. Depending on the voltage can be put to different uses. For example, a voltage reference can be used in temperature monitoring and control systems as a means of providing a temperature set point that can be regulated.

1N4908 can also be used in digital circuits, as part of a clipper circuit that limits voltage levels. 1N4908 can be connected in parallel with a clipping circuit, a switch configuration, to prevent signal levels above the breakdown voltage to enter the output. This application is particularly useful in signal transmission and detection systems, in order to protect from signal issues and signal degradation.

Working Principle

A 1N4908 Zener diode is constructed using a p – n junction. When a normal p – n junction is connected in a forward bias (positive voltage to the p region and negative to the n region), the junction behaves like an ordinary diode and it allows electrons to flow through it. When a 1N4908 is connected in a reverse bias, a low current flows through the diode. This reverse current is called the “zener current” and is proportional to the applied voltage over the junction.

When the applied voltage is increased beyond the “breakdown voltage”, the zener current increases drastically and the junction behaves like an ideal zener diode. The breakdown voltage of 1N4908 can range from 1.5 to 41 V, depending on the selection of the particular device. At the breakdown voltage, the device conducts for a wide range of voltage levels and is thus used for operating as a voltage regulator.

It is also important to note that 1N4908 Zener diode generates a small amount of noise because of the breakdown current. This noise can cause interference in other parts of the circuit involving the 1N4908, thus a noise filter must be used within the circuit to prevent this issue.

In summary, 1N4908 Zener diode is a single type diode. It is mainly used for voltage regulation, voltage reference and clipping applications. It contains a single p – n junction and operates over a wide range of breakdown voltages (1.5 – 41 V). In addition, it must be used within a circuit in conjunction with a noise filter in order to prevent interference.

The specific data is subject to PDF, and the above content is for reference