2N7002 Discrete Semiconductor Products

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2N7002 Application Field and Working Principle

The 2N7002 transistor is an N-Channel enhancement mode field-effect transistor (FET) and is one of the most commonly used power MOSFETs available due to its low cost and simple circuit designs. Its application fields range from general switching and amplifying circuits, to RF amplifiers and power supplies. It is also used in digital and analog circuits such as switching power-supplies, data converters and DC-DC converters. With its low drain-source on-resistance, low gate drive power demand, fast switching speed and maximum drain current rating of 1.7 A, it is highly suitable for use in various power applications.

Working Principle

The 2N7002 transistor consists of three terminals: gate (G), drain (D), and source (S). These three terminals are connected to a P-Channel MOSFET, which is the core component. When the gate is left open, no charge carriers can flow between the drain and source, and thus the device is off. When a positive voltage is applied to the gate terminal, a depletion region of charge carriers is created between the gate and the drain and source. This in turn causes a current flow between the drain and source, and the device is then turned on.

The gate terminal acts as a switch, and the voltage level of the gate controls the current flow between the drain and the source. As the voltage at the gate rises, the current flow between the drain and source increases, and vice versa. The 2N7002 transistor is considered to be an enhancement mode MOSFET, which means that a positive voltage must be applied to the gate in order to turn the device on.

Circuit Design

The 2N7002 transistor can be used in various electronic applications, such as motor control, power supplies, inverters, amplifiers, and switching circuits. It can be connected in either a Switch On State or a Switch Off State. To create a switch on state, the gate of the transistor is connected to a positive voltage, while the source is connected to ground. When a voltage is applied to the gate, the transistor turns on and a current flows through the transistor. To create a switch off state, the gate is connected to ground, while the source is connected to a positive voltage. When a voltage is applied to the source, the transistor turns off and no current flows through the transistor.

The 2N7002 transistor is also used in linear applications, such as shunt regulators, linear amplifiers and current generators. In these applications, the transistor is connected in its linear region, so that the voltage at the drain follows the gate voltage as a proportion. By connecting the drain to a reference voltage, the gate voltage can be used to control the current flowing in the device.

Conclusion

The 2N7002 transistor is an N-Channel enhancement mode MOSFET. It is highly suitable for use in various power applications, as it has a low drain-source on-resistance, low gate drive power demand, fast switching speed and a maximum drain current rating of 1.7A. The 2N7002 transistor can be used in various electronic applications, such as motor control, power supplies, inverters, amplifiers, switching circuits, linear applications, such as shunt regulators, linear amplifiers and current generators. It can be connected in either a Switch On State or a Switch Off State, depending on how it is connected.

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