SMDA15E3/TR7 Circuit Protection

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Transient Voltage Suppressor (TVS) Diodes are a class of semiconductor components that protect electronic circuits from high voltage electrical transients like spikes and surges. TVS diodes typically have a breakover voltage or clamp voltage much higher than normal operating voltage, so they can effectively protect circuits from overvoltage transients by diverting them to the ground. The SMDA15E3/TR7 is an example of a TVS diode that is designed to provide bidirectional protection against high–energy surges.

Introduction

The SMDA15E3/TR7 is a surface mount diode that offers bidirectional protection from voltage transients for both AC and DC motors, as well as DC power supplies. It is constructed from a zinc oxide (ZnO) chip bonded within a two–lead plastic package. The SMDA15E3/TR7 is designed to be used in equipment that needs to withstand over-voltage surges or spikes due to their high surge current and energy handling capability. It can also be used as a protection element for many electronic components, such as integrated circuits and opto–electronic components. These diodes offer low leakage current, and their low dynamic resistance results in better noise suppression and faster clamping of transients.

Features

The SMDA15E3/TR7 protects circuits by providing a low forward voltage drop and a relatively high maximum peak pulse power of 4.4 kW. The device has a low dynamic resistance of 150mΩ and a peak pulse current rating of 162A. The peak pulse current can be scaled down further with additional external components such as resistors and capacitors. The low dynamic resistance ensures better suppression of noise and fast clamping of transients.

It also has a low temperature coefficient, which ensures better performance at elevated temperatures, and a low clamping voltage of 15V. Another significant feature of this device is its reliability. It is UL and cUL tested and approved, as well as rated for long-term operation in a range of environments and conditions.

Applications

The SMDA15E3/TR7 is widely used in DC motor controllers, AC motors, and DC power supplies. It is also used in surge and overvoltage protection applications. It can be used to protect electronic components, integrated circuits, opto–electronic components, and data transmission lines. It is suitable for use in equipment exposed to overvoltage transients due to its high surge current and energy handling capability.

Working Principle

The SMDA15E3/TR7 functions as a bidirectional TVS diode, drawing excessive current away from the protected circuit and dissipating it in the associated resistor and/or capacitor. The Zener diode is designed to have a breakdown voltage slightly above the normal operating voltage, so that it will not turn on until the voltage exceeds the breakdown voltage. Once it is triggered, it will effectively divert the high–voltage transients away from the sensitive components and protect the circuit against overvoltage.

The device also has an avalanche breakdown diode built into it. The avalanche breakdown diode is triggered when the voltage reaches the breakdown voltage, allowing a high current to flow through the diode. This current will dissipate in the resistance current limiting resistor and/or capacitor. The avalanche breakdown diode also helps to limit the voltage on the protected circuit, ensuring that it does not reach dangerous levels.

Conclusion

The SMDA15E3/TR7 is a popular TVS diode designed to protect circuits from destructive voltage transients. It has a low dynamic resistance and a low clamping voltage, as well as a high peak pulse power rating of 4.4 kW. It is widely used in DC motor controllers, AC motors, DC power supplies, and many other applications where overvoltage protection is needed. It also has a low temperature coefficient and is UL and cUL rated for long–term operation in a range of environments. Finally, it works by providing a low voltage drop and triggering the avalanche breakdown diode to divert excessive current away from the protected circuit.

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