VLZ11A-GS18

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VLZ11A-GS18 Diodes - Zener - Single Application Field and Working Principle

The VLZ11A-GS18 is a Zener diode that is widely used in small and medium power circuit applications. It is a single type diode, meaning it consists of just one p-n junction of semiconductor material, and uses the Zener effect to provide a highly reliable voltage regulator, surge protection, or over-voltage protection in the circuit.

The VLZ11A-GS18 is designed to provide stable and precise voltage regulation for sensitive equipment, making it ideal for use in power supplies, instrumentation, electromechanical systems, automotive, and communications networks. It can also be used as part of a larger circuit for protection against overvoltage, providing reliable over-voltage protection for sensitive components.

Physical Characteristics

The VLZ11A-GS18 diode is a small - and medium-sized package with a nominal power dissipation rating of 0.5 W and 500 V reverse breakdown voltage. Its axial lead configuration makes it easy to mount on a printed circuit board and popularly used in many applications. Its maximum operating temperature is +125°C with a storage temperature range of -65 °C to +150 °C.

Working Principle

In operation, the VLZ11A-GS18 has a current flow in one direction, allowing it to act as a rectifier. However, when the forward-biased voltage applied to the diode is increased above its Zener voltage, the Zener region of the diode kicks in, resulting in a reverse current that results in the diode regulating the voltage in the circuit.

The actual voltage control capability of the diode is determined by the difference between the actual breakdown voltage that the diode is designed for and the minimum breakdown voltage. Generally, the acceptable range of the actual breakdown voltage should not differ much from its nominal breakdown voltage, otherwise it will become unstable and will not be able to provide reliable protection to the system.

Applications

Due to its compact size, ease of mounting, and high temperature operating range, the VLZ11A-GS18 is widely used in various applications, such as power supplies, automotive circuits, medical systems, audio and video equipment, data acquisition systems, and communication networks.

In power supplies, the diode is used to provide voltage regulation and protection from over-voltage or spikes. In automotive circuits, the diode is used for the same purposes and for emergency cut-off in case of a short circuit or power loss. In medical systems, the diode can be used to provide patient protection, while in communication networks, it is used to provide protection against electrostatic discharge.

The VLZ11A-GS18 is also used in audio and video equipment, where it can be used to protect LEDs and other electronic components from transient over-voltages. It is also used in data acquisition systems to protect various sensors and transducers from electrical noise and power surges.

Conclusion

The VLZ11A-GS18 is a reliable and robust Zener diode that is widely used in many different types of applications. It provides precise voltage regulation and surge protection for sensitive electronics and power supplies, making it ideal for a wide range of professional and commercial applications.

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