30KPA71A-B

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TVS (Transient Voltage Suppressor) diodes, such as the 30KPA71A-B, are essential components of any working circuit that is sensitive to potentially dangerous spikes in voltage. They can provide an unparalleled level of protection against overvoltage by shunt-conducting current away from components that need protection. Therefore, it is important to understand the range of application fields in which TVS-diodes can be employed, along with the principles on which they work.

Application Field

The 30KPA71A-B is a bi-directional TVS-diode, designed for a maximum breakdown voltage of 30 volts and with a reverse standoff voltage of 28V. It\'s intended to be used where the reverse standoff voltage (Vr) is close to the supply rail voltage. It exhibits an impressive power rating of either 300W or 562W, depending on the current pulse duration.

The most common applications for TVS-diodes include: power supplies and voltage regulators, AC and DC motors, controllers, circuits vulnerable to ESD and electrostatic discharge, automotive systems, and telecommunications equipment. They are often used as the main means of protection against overvoltage in consumer electronics ranging from smartphones and tablets to televisions and laptops.

Working Principle

Essentially, the TVS-diode works by lowering the voltage due to its non-linear electrical behavior. It acts as an ideal clamp and starts conducting when the voltage reaches the breakdown voltage or exceeds it. It quickly absorbs the power spike, grounding it and prevents it from damaging the underlying circuit.

As the current passes through the diode, it creates a voltage drop. When the peak of the surge enters the diode and starts conducting current, the voltage is clamped at the peak current level. This mechanism greatly limits the voltage seen in the circuit, keeping it well within the operating range of the components.

Once the surge is gone, the break down voltage will protect the underlying circuit from sudden transients. The 30KPA71A-B is designed with an impressive peak pulse current that can withstand very large surges in a short period of time.

Conclusion

TVS-diodes such as the 30KPA71A-B can play an important role in protecting vulnerable circuits from overvoltage. Their bi-directional features make them suitable for both AC and DC systems, and their peak pulse current is able to cope with large surges of current. Therefore, they should be used wherever protection from overvoltage is necessary.

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