SMF75AHRQG Circuit Protection

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Transient Voltage Suppressor or TVS diodes are the form of low capacitance, bidirectional, unidirectional or three terminal protection devices that are specially designed to protect sensitive electrical, programmable logic circuits from voltage transients caused by ESD or electrical surge. They come in a variety of footprints to cater to specific requirements and the SMF75AHRQG is one such part with its own set of applications and working principle.

The SMF75AHRQG is a 600-watt unidirectional Transient Voltage Suppressor diode for voltage surge. Ideal for protecting voltage sensitive components from transient fault currents, it is based on a silicon low capacitance planar design. A green mold compound and SMA package makes it well suited for both automated and manual board loading and unloading. Being 0.65mm in thickness, it takes up very little board space and comes with a solder profile that meets the requirements of JEDEC/IPC for reflow soldering.

The SMF75AHRQG datasheet lists it as having a maximum clamping voltage of 17.5 volt with a working voltage of 6.5 volts and a breakdown voltage of 6.8 volts, making it an ideal choice for applications where both reliability and size constraints need to be taken into account. It also has a junction capacitance of 6pF, making it less susceptible to noise and transient signal voltage and allowing for a quick and reliable response. Its working temperature range is listed as -65 C to 150C and an operating storage temperature range of -65 C to 150 C, suggesting that it can handle very high temperature applications and offers long-term operational stability.

The SMF75AHRQG is mainly used for power supply protection in telecommunications, computers, peripherals and several other consumer electronics applications. Its design makes it ideal due to its low capacitance and its ability to dissipate power quickly subsequent to an over voltage event. It is also an excellent choice when used in high frequency noise environments, owing to its low junction capacitance. Additionally, it can also provide a highly stable environment in situations where sudden changes in signal voltages may occur.

As far as its working principle is concerned, it is based on a Gunn reverse biasing effect. When reverse biased, the diode’s characteristic of junction capacitance causes it to draw current and clamp voltage exceeding its breakdown voltage. The amount of current drawn can be increased by adding an external resistor at 0.2mA, as per the datasheet. Moreover, when the voltage returns to normal, the current flowing from the junction capacitance ceases.

In conclusion, the SMF75AHRQG is a reliable, efficient and highly capable Transient Voltage Suppressor diode for various voltage surge or ESD protection applications. Its low capacitance and overall fixture make it ideal for a variety of scenarios and its silicon planar design makes it suitable for a wide range of industry requirements.

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