TVS - Diodes: SMCJ45A-QH Application Field and Working Principle

Introduction to TVS - Diodes

TVS-Diodes, also known as Transient Voltage Suppressors (TVS) are semiconductor devices specially designed to protect against transient voltage and surges. They are essential for high-voltage surge protection. This is because these devices are used in circuits whose parts are prone to voltage surges caused by lightning, power surges, short circuits, and other transient phenomena. TVS diodes protect the system from catastrophic excessive currents. The TVS diode can be compared to a variable resistor, where its resistance decreases as the applied voltage increases. When the rated current of the diode is exceeded, it enters a "breakdown" region, dissipating the power caused by the surge. This "clamping" action prevents damage due to the increased current during the surge or spike.

SMCJ45A-QH: Application Field and Working Principle

The SMCJ45A-QH is a surface mount transient voltage suppressor (TVS) diode. It has a maximum operational voltage of 600V, making it an ideal choice for a wide variety of high-voltage applications. This device is typically used in applications such as lightning and power surge protection, automotive electronics, and industrial or telecom systems.The working principle of the SMCJ45A-QH is similar to other TVS diodes. It is designed to protect sensitive electronics from voltage surges, in which its resistance decreases as the applied voltage increases. When the voltage exceeds the specified rating, the SMCJ45A-QH enters a "breakdown" region, wherein it then dissipates the power caused by the surge and clamps it to a safe level.

Conclusion

The SMCJ45A-QH Television Voltage Suppressor is an essential device for many high-voltage surge protection applications. Its maximum operational voltage of 600V makes it an ideal choice for applications such as automotive electronics, industrial and telecom systems, and lightning and power surge protection. The working principle of the SMCJ45A-QH is well understood. When the voltage exceeds the specified rating, the device enters a "breakdown" region and dissipates the power caused by the surge.