1SMB5936B-13

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Diodes are devices that allow current to flow in one direction only, while blocking current in the opposite direction. Zener diodes are specialty diodes that allow current to flow backwards when the voltage across them reaches a certain threshold or breakdown point. This property of Zener diodes makes them useful in many applications, such as voltage regulation and voltage reference. The 1SMB5936B-13 is a single part uni-directional Zener diode from Diodes Incorporated. In this article, we will discuss the application field and working principle of the 1SMB5936B-13.

Applications

The most common use of a Zener diode is as a voltage regulator, which helps to provide a steady output voltage regardless of the current or voltage changes on the input side. The 1SMB5936B-13 is also well-suited for this type of application as it has an extremely low leakage current, a small package size, and a low forward voltage drop. In addition to voltage regulation, the 1SMB5936B-13 can be used as a current limiting device or a circuit protector. Its use in these roles is due to its robust die construction and wide operating temperature range.

The 1SMB5936B-13 can also be employed as an over-voltage protection device. This capability is based on the fact that when the voltage across the diode reaches a certain threshold (typically 5.3V or 6.2V), the diode will be “shocked” into conduction, conducting a small amount of current and thus limiting the voltage at the output. This solution is often used in automotive applications, where the system needs to be protected from high voltage spikes that could damage sensitive electronic components.

Working Principle

The 1SMB5936B-13 is a Zener diode, meaning that it has an inherently different working principle than the typical rectifier diode. The principle of the Zener diode is similar to the principle of a breakdown diode, in that it is designed to conduct current in both directions when the voltage across it reaches a certain threshold. This threshold, known as the Zener voltage, is specified in the manufacturer\'s datasheet. It is normally in the range of 3.3V to 12V for the 1SMB5936B-13.

Once the voltage across the diode reaches the Zener voltage, the diode will conduct a small current from the cathode to the anode. This current is often referred to as the Zener current, and it is typically less than 1 mA. As long as this current is maintained, the voltage across the diode will remain at the Zener voltage. This property is known as the Zener effect, which is the basis for the diode’s use in voltage regulation and other applications.

The 1SMB5936B-13 has a uni-directional working principle, meaning that it only permits current to flow in one direction – usually from the anode to the cathode. This makes the diode suitable for use in applications such as voltage regulation and current limiting.

In addition to the uni-directional working principle, the 1SMB5936B-13 also has an extremely low reverse leakage current. This means that even if the voltage across the diode is lower than the specified Zener voltage, the diode will still have a very low leakage current – typically less than 200 nA. This feature makes the 1SMB5936B-13 especially suitable for applications where low leakage is important, such as over-voltage protection.

Conclusion

The 1SMB5936B-13 is a uni-directional Zener diode from Diodes Incorporated with a wide range of applications. It is suitable for use as a voltage regulator, a current limiter, or a circuit protector, and its small package size and low forward voltage drop make it well-suited for these types of applications. The 1SMB5936B-13 also has a low reverse leakage current, making it an ideal choice for over-voltage protection applications. By understanding the application field and working principle of the 1SMB5936B-13, engineers and other design professionals can make the best possible choice for their application.

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