SL15E3/TR7

TVS - Diodes: SL15E3/TR7 Application Field and Working Principle

TVS diodes, also referred to as Transient Voltage Suppression (TVS) diodes, are used to help protect sensitive electronic devices from voltage surges. These devices are designed to clamp off voltage when it reaches a certain threshold, limiting the amount of surge damage that can occur. The SL15E3/TR7 is one of the most widely used TVS diodes on the market today. This article will discuss its application field, as well as its working principle.

Application Field

The SL15E3/TR7 is primarily used to protect sensitive electronic circuits from electrostatic discharge (ESD) damage. This device is designed to quickly clamp off high voltage spikes, allowing low level signals to pass through unharmed. It is especially effective in protecting equipment from ESD strikes caused by airline passengers, or any other external source of electrostatic discharge. Additionally, the SL15E3/TR7 is suitable for use as a line protection device in telecom applications.

Working Principle

The SL15E3/TR7 is a unidirectional TVS diode, meaning it only conducts electricity in one direction. The diode has two layers of metal-oxide varistors (MOVs) between which a trigger voltage is maintained. This trigger voltage is typically around 12V, and when a voltage spike exceeds the trigger voltage, the diode conducts electricity to provide a “path of least resistance” for the voltage surge. The MOV layers also act as a dampener; as the voltage passes through them, the MOVs absorb some of the energy and dissipate it as heat.

The general operation of a TVS diode can be seen in the following diagram. When a voltage spike rises above the trigger voltage, the TVS diode will begin to conduct current. The current will then be absorbed by the MOV layers, where it is dissipated as heat. This action limits the amount of surge current that is allowed to pass through the diode, protecting the connected equipment from damage.

Conclusion

In conclusion, the SL15E3/TR7 is an extremely popular TVS diode, used for its ability to quickly clamp off voltage spikes. The working principle of this device can be seen in the diagram provided, and this device is most widely used in applications where ESD protection is needed. By understanding its application field and working principle, engineers can make sure they are using the right TVS diode for their specific application.