VE0805K121R011

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TVS (Transient Voltage Suppressor) devices play a critical role in the over-voltage protection of electronic circuits. They provide low-dV/dt circuits protection from voltage surges, while suppressing disturbances on power or signal lines. They act as a safeguard against the damage caused by overvoltage events. The VE0805K121R011 is an axial leaded varistor specifically designed to protect circuits from overvoltage, and finding its application in consumer electronic devices. This article will discuss the application fields and working principles of the VE0805K121R011.

Application

The VE0805K121R011 is a varistor that provides surge protection in a wide variety of consumer electronic applications. This varistor is designed for use in electronics such as portable electronic devices, automobiles, computers, communications equipment, and power supplies. It is also designed for use in industrial systems and home appliances. In home appliances, it is mainly used for AC line and interface circuit protection.

Since VE0805K121R011 is an axial-leaded device, it is suitable for use in PCBs and other small electronics. It is capable of dissipating energy in excess of 750 Joules and features an additional thermal fuse for added protection. This device is constructed with a special alloy, which helps it to remain resistant to degradation over time. The rated operating voltage of this device is an impressive 125VAC and it can handle voltage fluctuations up to the rated value. The response time of this device is also very fast, which makes it suitable for use in high-frequency applications.

Working Principle

The VE0805K121R011 has a varistor core that mainly consists of PZT (Lead Zirconate Titanate) material. This material is used to create an electrically conductive junction, called a “capacitive junction”. When an electrical impulse is applied to the device, the PZT material responds by the so-called “varistance effect”. This effect causes the material to modify its electrical conductivity. This is how the device can absorb and dissipate excess voltage.

When excess voltage is applied, the PZT material of the VE0805K121R011 increases its electric conductivity. This, in turn, reduces the impedance of the device and causes a sharp decrease in voltage on the output side of the varistor. The excess electrical energy is then dissipated, protecting the equipment or circuitry from damage.

After the voltage and current spike has passed, the PZT material returns to its original state and the device will no longer have an effect on the current. This process allows the VE0805K121R011 to reset itself after every over-voltage event, ensuring a long-lasting and reliable protection.

Conclusion

The VE0805K121R011 is an axial leaded varistor that provides surge protection in a wide variety of consumer electronic applications. It is designed for use in electronics such as portable electronic devices, automobiles, computers, communications equipment, and power supplies. The device uses a PZT material which reacts to excess voltage by increasing its electric conductivity, allowing the device to absorb and dissipate the excess voltage. The VE0805K121R011 is a reliable and long-lasting device that offers excellent protection against over-voltage events.

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