IRF7379

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IRF7379 is an integrated P-channel field-effect transistor (FET) array, widely used in low-side load switching circuits as an electronic switch that can be manually switched on or off. It is composed of four internally connected P-channel power MOSFETs (Metal Oxide Semiconductor Field-Effect Transistor) along with temperature and voltage sensitive protection circuitry.

At an external level, IRF7379 is composed of a p-channel FET array, with drain and source outputs, as well as three to four control pins. The control pins, Gate, Enable and Drain, are used to operate and control the switch’s behavior. The pinout of the IRF7379 is usually indicated like this:

The Gate pin is responsible for controlling the states of the FET (on/off). A low voltage level places the FET in an off state, while a high voltage level will turn the FET on. The Enable pin is used to enable/disable the switch in general. When the Enable pin’s voltage is high, the FET will be able to turn on or off in response to the Gate pin’s voltage. However, when the Enable’s voltage is low, both the Gate and the Output states are disconnected, disabling the switch entirely.

The last control pin, Drain, is used to control the output voltage of the FET. By adjusting the voltage of this pin with respect to the source, it is possible to control the output voltage at a specific level, which is particularly useful for low voltage applications.

The IRF7379 is able to handle a range of common power supply voltages from 4.5V to 12V, and offers a very low path resistance of 0.75 ohms. It also has a very fast switching speed, up to 10kHz, which makes it suitable for a wide range of applications, such as motor and fan controllers, stepper motor drivers, LED lighting control systems, and more.

Using the IRF7379, it is possible to easily construct a power switch in order to manually move electrical power from one point to another. The circuit is composed of a low-side switch with a ground terminal connected directly to the source point, and the Drain pin controlling the output voltage.

In this typical on/off switch circuit, the Drain pin is normally connected to the positive side of the power supply. When the switching circuit is turned on, the voltage level at the Gate pin will be higher than the voltage at the Enable pin, causing the internal P-channel MOSFETs to turn on. As a consequence, the voltage at the Drain pin will drop and the circuit will be powered. When the switching circuit is turned off, the same mechanism will occur but in reverse, with the Gate pin being lower than the Enable pin, causing the MOSFETs to turn off and the Drain pin to return up to the positive voltage, effectively disconnecting the circuit.

IRF7379 is a versatile, efficient and reliable FET array that can be used in many applications. Thanks to its several control pins and low internal resistance, it is suitable for a wide variety of switching circuits and configurations. Besides, its fast switching speed makes it ideal for applications that require quick and reliable control.

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