SM30T47AY

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TVS (Transient Voltage Suppressor) diodes are a type of semiconductor device used for protection against transient voltages. The SM30T47AY TVS diode is one of the most popular series of TVS diodes available on the market. This article will explain the application field and working principle of the SM30T47AY.

SM30T47AY TVS Diodes are designed to provide protection against electrical transients such as electrostatic discharge (ESD), lightning, and surges. They are used in AC/DC, DC/DC, and AC/AC circuits, and can be found in consumer electronics, automotive, industrial, and military applications. The SM30T47AY is designed for use in high-reliability, high-performance applications where a dependable protection network is needed.

The SM30T47AY series TVS diodes have a diode capacitance of 1 pF and an average breakdown voltage of 30V. They have a high surge capability of 2A (IEC 61000-4-5) and a low reverse leakage current of up to 100nA at 5V. They feature a large reverse surge ratio of 10:1 and are non-thermal in nature, meaning they don’t require extra heatsinking or fan cooling.

The SM30T47AY TVS diode utilizes a bidirectional structure, meaning it can protect against both positive and negative transient overvoltages. A Zener diode structure is used, wherein the diode is reverse biased until the voltage reaches the breakdown voltage, at which point the diode begins to conduct. Since the diode is reverse biased until the breakdown voltage is reached, the diode has low capacitance and low resistance which makes it ideal for fast response time applications.

In situations where the reverse voltage exceeds the breakdown voltage, the SM30T47AY diode acts as a switch, rapidly controlling the transient voltage. This greatly reduces the stress on the protected circuit by limiting the surge or ESD current. It also dissipates the overvoltage energy in the form of heat, thus protecting the device from damage.

The SM30T47AY is available in a variety of case sizes and configurations, including plastic through-hole packages as well as surface-mount packages. These diodes are UL Recognized, CSA EMI Approved, and RoHS Compliant, making them suitable for a wide range of applications.

In conclusion, the SM30T47AY TVS Diode is a reliable and robust protection diode, designed to provide protection against transient overvoltages. It utilizes a Zener diode structure, allowing for fast response time and low capacitance and low resistance. Thanks to its versatile case sizes and package types, the SM30T47AY is suitable for a wide range of high-reliability applications.

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