SM1603/TR13 Circuit Protection

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TVS - Diodes: SM1603/TR13 application field and working principle

A Transient Voltage Suppression Diode (TVS) is a diode specifically designed to protect electronic equipment from voltage spikes caused by electrostatic discharge (ESD) and lightning. The SM1603 and TR13 devices are two types of surge protection diodes that offer protection for circuit equipment from electrical spikes. This article will discuss the application fields and working principles of these two types of diodes.

SM1603 Diode

The SM1603 diode is ideal for protecting sensitive circuits from transient voltage spikes caused by electrostatic discharge (ESD), lightning, and inductive switching. This diode is a low capacitance transient voltage suppressor (TVS) designed to withstand ESD up to 30 kV Human Body Model (HBM) and Induced Lightning up to 8 A. It features reverse standoff voltages from 5.0 V to 24.0 V and low clamping voltage of 17.0 V. The SM1603 is available in a small SOT-23 package that does not require heatsinks or extra shielding.

TR13 Diode

The TR13 diode is designed to provide surge protection for cables and other electrical equipment. This type of diode is ideal for protecting electrical components and circuits from transient voltage spikes caused by electrostatic discharge (ESD), lightning, and inductive switching. The TR13 provides reverse standoff voltages from 6.0 V to 20.0 V and clamp voltage of 17.0 V. It is capable of withstanding up to 30 kV HBM ESD and 8 A induced lightning.

Working Principle

The working principle of these two types of diodes is the same: they act as reverse voltage protection. When the voltage applied to the diode exceeds its reverse breakdown voltage, the diode is triggered and begins to conduct. This action limits the amount of current that can pass through the circuit, thus preventing damage to sensitive electrical components. The amount of current that the diode can conduct is determined by its peak current rating. For the SM1603 and TR13 diodes, this is 8 A.

Applications

The most common application for the SM1603 and TR13 diodes is providing surge protection for electronic systems. They can be used in automotive, industrial, medical, and consumer electronics. They are also suitable for protecting personal electronics such as cell phones, tablets, and laptops from transient voltage spikes caused by electrostatic discharge (ESD), lightning, and inductive switching. The low capacitance of the SM1603 makes it ideal for high-speed digital applications such as USB ports and HDMI cables.

In addition to surge protection, the SM1603 and TR13 diodes can also be used in voltage clamping applications. They can be used to protect sensitive components from unregulated input voltages by clamping the voltage to a safe level. This allows the circuit to continue functioning without experiencing any damage from over-voltage.

Conclusion

The SM1603 and TR13 diodes are a versatile and reliable solution for surge protection in a variety of electronic applications. They feature low capacitance and reverse standoff voltages from 5.0 - 24.0 V, and are capable of withstanding up to 30 kV HBM ESD and 8 A induced lightning, making them ideal for protecting sensitive components. In addition, they can be used for voltage clamping applications to limit the input voltage to a safe level.

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