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TVS Diodes: CPDT-5V0U Application Field and Working Principle

Transient Voltage Suppressor Diode (TVS Diodes), also known as a Transient Voltage Suppressor (TVS), is a part of a two-terminal and general-purpose Surge Protection Device (SPD). TVS diodes are a type of silicon semiconductor diode optically designed to provide protection against voltage transients induced by lightning and other causes. It protects a system or a device from high voltage electrostatic or current discharges.

CPDT-5V0U Application Field

CPDT-5V0U is an unidirectional TVS diode and it is ideal for protecting sensitive electronic equipment from damage caused by high energy transients. CPDT-5V0U diodes are suitable for protecting against lightning, surge, electrostatic discharge, pulse radiation, and other high energy phenomenon.

CPDT-5V0U are offered in DO-214AB Low Profile Surface Mount packages. It has a peak pulse power rating of 5W at a 10/1000μs waveform. They also have a low clamping voltage of 5V and a maximum operating voltage of 6.5V. Thus, their application lies in telecommunications, industrial control systems, automotive electronics, and consumer electronics.

It is widely used for transient voltage suppressing applications like the protection of automotive event data system (EDS) ECU, sensors, and actuators, and also for over-voltage protection of switching regulators, computer and telecomms, and other electronic equipment.

Working Principle of CPDT-5V0U

The CPDT-5V0U diode achieves its unique protection characteristics thanks to a reversed Avalanche diode silicon PN junction. When a strong electrical impulse such as lightning strikes, the PN junction breaks down and the device suddenly conducts current due to the avalanche effect. The connection between the anode and cathode (A-K) of the diode is balanced and is represented by a forward resistance.

In order to protect sensitive electronic components such as microprocessors and transistors, the CPDT-5V0U devices are designed to operate in a fraction of a microsecond, 10-40µs. After the transient protection is finished, the device will return to its open circuit state. CPDT-5V0U are designed to provide full wave protection by passing surge currents from both positive and negative directions, thus providing efficient transient protection.

Conclusion

In this article, we discussed the CPDT-5V0U diode, its application field, and working principle. We learned that the CPDT-5V0U is a unidirectional transient voltage suppressor diode which is ideal for protecting sensitive electronic equipment from damage caused by high energy transients. It can be used for a wide range of applications such as telecommunications, industrial control systems, automotive electronics, and consumer electronics. We also learned about the working principle of CPDT-5V0U, which is based on the reversed Avalanche diode silicon PN junction. As the PN junction breaks down, the device suddenly conducts current due to the avalanche effect, and the device will reset after the transient protection is finished.

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