20KPA204

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TVS diodes are an important part of circuit protection due to their ability to protect a circuit against transient voltage spikes. Among the range of TVS diodes available on the market, 20KPA204 is becoming increasingly popular due to its high power dissipation capacity, fast response time and reliable surge protection. In this article, we will discuss the application fields and working principle of the 20KPA204.

Application Fields

The 20KPA204 is a high power Unidirectional Transient Voltage Suppressor (TVS) diode specifically designed for secondary protection of digital and analog electronic circuits, especially those found in speech signals, automotive applications such as in-vehicle entertainment systems, and low-density network server and router applications. Its surge protection capability can reduce the possibility of system failures caused by transient voltage spikes due to lightning and other power-grid related events.

The 20KPA204 provides an optimal protection against high voltage overstresses caused by over-voltage, AC power cross, and inductive load switching. It also helps to prevent multiple current surges due to contact arcs and load dump. Additionally, the TVS diode limits the peak transient energy that can pass through and cause damage to the protected components.

Working Principle

The 20KPA204 comprises of Silicon Avalanche Diodes (SAD) or Metal Oxide Varistor (MOV) stacked with NPN transistors in a monolithic assembly. The SAD provides fast response time while the MOV offers more power. When subjected to a high surge of voltage, the NPN transistor acts as a switch which quickly cuts off the voltage and the SAD/MOV clamps the voltage to an appropriate level, above which permanent damage or long-term degradation of components can be avoided.

The 20KPA204 also provides effective and fast protection against electrostatic discharge (ESD), and can absorb high levels of energy. It is also designed to protect two lines with a single diode, hence offering cost savings. Furthermore, it is built in on-chip temperature sensors to protect against over-temperature, and contains fail-safe protection circuitry which is mainly used in automotive applications.

The 20KPA204 comes in 3 different versions for various power needs. The P20 or IP20/IV20 version has a peak pulse power capability of 33kW, and a stand-off voltage of 11.2V. The S30 or IP30/IV30 version has a peak pulse power of 38kW and a stand-off voltage of 14V, while the W30 or IP40/IV40 version has a peak pulse power of 45kW and a stand-off voltage of 18V.

Conclusion

The 20KPA204 TVS diode is a bi-directional device designed to protect against transient voltage surges. It has a fast response time, high peak pulse power capability, and built-in temperature sensors. It also offers cost savings due to its two-line protection with a single diode. The 20KPA204 is suitable for a range of applications, especially those related to automotive, speech, and low-density server and router networks.

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