Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

TVS - Diodes

The 30KPA78A-B Application Field and Working Principle is such that it is a transient voltage suppressor, developed to protect circuits from high voltage and high current transients, such as those caused by electrostatic discharge (ESD) or lightning strikes. It is available in surface-mount and through-hole devices with a variety of breakdown voltages and power ratings. It has a bidirectional flow of current, which makes it suitable for suppressing both positive and negative transients.

Description and Operation

The 30KPA78A-B is designed to limit over-voltage transients and provide a path for the current to be reduced, thus protecting internal circuit components from the transient voltage. The device consists of two back-to-back Zener diodes placed in parallel, which are connected from the external power supply to ground. The Zener diodes provide a breakdown voltage when they reach a certain voltage (specified on the data sheet) and in so doing, conduct current from the external power supply. This current is limited by the internal impedance of the zeners. When the voltages increase beyond the breakdown voltages, the zeners conduct current and the current is limited by the internal impedance.

The breakdown voltage of the 30KPA78A-B is dependent on both the external voltage applied and the temperature of the diodes. As the voltage increases, the breakdown voltage of the device will also increase up to a maximum. Conversely, as the temperature of the device increases, the breakdown voltage will decrease as the internal resistance of the Zener increases. This allows the device to remain relatively stable over a wide temperature range.

Applications of 30KPA78A-B

The 30KPA78A-B is a useful device for circuit protection from transient voltage surges caused by things such as ESD and lightning strikes. It can be used to provide protection in sensitive electronic equipment, such as computers, medical devices, and telecom equipment. The device can also be used to protect circuit components from the over-voltage transients that can occur in power supplies, automotive circuits, industrial equipment, and other applications.

Advantages and Disadvantages

The 30KPA78A-B has several advantages: it has a wide operating temperature range, it has a fast response time, it is relatively inexpensive, and it has a wide range of available breakdown voltages. It is not, however, suitable for high-frequency applications. Furthermore, the device has a relatively low peak power rating, which means it can be overwhelmed by high-voltage or high-current transients.

Conclusion

The 30KPA78A-B is an effective device for providing protection from transient voltage surges in sensitive applications. It is a low-cost solution with a wide operating temperature range and the capability to provide protection at a variety of breakdown voltages. It has a relatively low peak power rating, however, making it unsuitable for high-voltage and high-current transients.

The specific data is subject to PDF, and the above content is for reference