TVS - Diodes

A transient voltage suppressor (TVS) diode is a protective device that has a clamping voltage above a normal operating voltage. It is mainly used to suppress transients or overvoltage in cables, circuits, and buses in end-equipment. The TVS diode BZW04P8V5BHE3/73 is an unidirectional diode for protection against transient overvoltage with a peak power of 1.5 Watt.

Application Field

This TVS diode is suitable for several applications, such as overvoltage and over-current protection in communications equipment. It displays overvoltage protection for loads when connected between supply and ground lines, and it is also used for general-purpose overvoltage protection for power lines and data lines. Additionally, this diode is approved by Motorola and is also suitable for ESD protection in other devices.

Working Principles

During normal operation the TVS diode can simply be thought of as an open circuit with no current flow. When the input voltage reaches the clamping voltage, however, the diode switches on and begins to conduct current. This switches the diode from its high resistance state to its low resistance state. When the diode is in its low resistance state, any excess voltage between the supply and ground lines is dissipated into the power supply.

When circuit protection is required, the TVS diode is typically connected between the supply and ground lines. Then, when an overvoltage occurs, the diode begins to conduct, reducing the voltage between the supply and ground lines. This reduces the possibility of damage to components connected on the signal line.

Conclusion

In summary, the BZW04P8V5BHE3/73 TVS diode is a unidirectional diode suitable for several applications such as overvoltage and over-current protection, general-purpose overvoltage protection, and ESD protection. It operates by switching from its high resistance state to its low resistance state when the input voltage reaches the clamping voltage. This helps protect end-equipment from transients or overvoltage in cables, circuits, and buses.