STP17NK40Z

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The STP17NK40Z is a N-channel MOSFET, or metal-oxide-semiconductor field effect transistor, produced by STMicroelectronics. It typically provides enhancement mode, meaning that current can only flow when it is activated. It is a surface-mount device with a low on-resistance, used in many applications that require voltage control and fast switching times. In this article, we will discuss the application field and working principle of the STP17NK40Z.

Application Field

The STP17NK40Z is commonly used in applications such as DC-DC converters, audio amplifiers, battery chargers, DC motor drivers, and high-side switching. It is also used in home appliance applications such as air conditioners, dishwashers, washing machines, TV sets, and LED drivers. Finally, it is used in the automotive industry for features such as power windows, electronic power steering, and windshield wipers.

Working Principle

The STP17NK40Z is a MOSFET based on a vertical N-channel, also known as a VN-channel, structure. This allows for fast switching speeds due to the small chip size and vertical architecture of the transistor. When the gate voltage is applied, the n-type epitaxial layer is connected to the drain, forming an N-channel and allowing current to flow to the drain. When the gate voltage is removed, the N-channel is cut off and the current stops flowing. This fast switching capability means that devices using the STP17NK40Z can operate at high speeds.

The device also features a low maximum rDS(on) rating of 0.24 Ω typically at 10V, making it ideal for high current applications. The manufacturer also claims a typical output capacitance of 2 pF, making it suitable for use in high frequency switching applications.

In addition to these features, the device is relatively tolerant of high environmental temperatures, meaning that it is suitable for use in harsh environments and in applications such as automotive electronics. The device can withstand a maximum operating temperature of 175°C, as stated by STMicroelectronics.

Conclusion

In conclusion, the STP17NK40Z is a surface-mount device suitable for high frequency switching applications due to its low output capacitance and fast switching speed. It is also tolerant of high environmental temperatures and is commonly used in the automotive industry for power windows, electronic power steering, and windshield wipers. Finally, its low on-resistance makes it suitable for applications requiring high current.

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