30KPA84A Circuit Protection

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TVS (Transient Voltage Suppressors, TVS diodes, Transient Voltage Surge Suppressors) are a type of diode designed to protect circuits from transient voltage events, such as those caused by lightning strikes or ESD (electrostatic discharge). The 30KPA84A is just one type of TVS device designed to provide protection from these transient voltage events. In this article we will explore the application fields and working principles of the 30KPA84A device.

The 30KPA84A is designed for use primarily in automotive and industrial applications, though it can be used in many types of circuits. It has an operating voltage range from 4.5V to 28V and a Max Vbr of 30V. It is designed to provide protection from transient voltage spikes of up to 80 Volts (V/us). The 30KPA84A has a peak power of 160 Watts (W), but its power rating is typically limited to 30 Watts, which is determined by its breakdown voltage. The device is also rated for a pulse peak energy of 2 Joules (J).

The 30KPA84A is a three-terminal device and is constructed using an epitaxial silicon construction of NPN and PNP power transistors. The outer two pins are the anode and cathode and the middle pin is the gate. The gate is used to control the on/off states. When the voltage across the anode and cathode is below the reverse breakdown voltage of the device, it is off. If the voltage is greater than the breakdown voltage it is on and provides protection from transient voltage events.

The 30KPA84A device operates on the principle of avalanche breakdown. This is a phenomenon where, when a certain voltage is applied to a p-n junction, electron-hole pairs are created, which in turn create more electron-hole pairs in a chain reaction. This process causes an abrupt increase in current, like an avalanche, and is the basis of avalanche breakdown. The 30KPA84A uses avalanche breakdown to provide protection against transient voltage events.

The 30KPA84A is rated for an repetitive peak pulse current of up to 8 Amps (A). It is also rated for a typical response time of 1.2 nanoseconds (ns) for a 8/20µs pulse, making it suitable for high-speed applications. This device also has a low leakage current, which it below 1 microamperes (µA). All of these features make the 30KPA84A a suitable choice for protecting circuits from voltage transient events.

In summary, the 30KPA84A is a three-terminal TVS device designed for use primarily in automotive and industrial applications. It has an operating voltage range of 4.5V to 28V and a Max Vbr of 30V. It is rated for a peak power of 160W, a pulse peak energy of 2J, and a repetitive peak pulse current of up to 8A. Additionally, it has a typical response time of 1.2ns for a 8/20µs pulse, and a low leakage current below 1µA. The 30KPA84A device operates on the principle of avalanche breakdown to provide protection from transient voltage events.

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