2N5485

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The 2N5485 is a Motorola field-effect transistor (FET) designed primarily for use as a low-noise amplifier in radio receivers. It operates in the frequency range of 1 to 2000 megahertz. The 2N5485 is a double-gate depletion-mode device, also known as a dual-gate FET, consisting of two single-gate FETs. This makes it ideal for use as a pre-amplifier in a home stereo receiver where low noise is important.

The 2N5485 is a depletion-mode FET, which means that the device does not need to be biased with a DC current or voltage to operate. Instead, it can be used with an AC signal. The 2N5485 is also a very low-capacitance device, making it ideal for use in very high-frequency circuits. This makes the 2N5485 ideal for RF amplifier applications, where the circuit must be able to handle frequencies up to 2000 MHz.

The working principle of the 2N5485 is based on the concept of field effect. As an external electric field is applied to the transistor\'s gate, it creates an inversion layer of charge carriers at the surface of the transistor\'s channel. This allows current to flow from the drain to the source. The amount of current flowing from drain to source is determined by the gate-to-source voltage. This allows the device to be used as an amplifier, where the gate-to-source voltage can be used to control the current flowing from the source to the drain.

The 2N5485 is often used for radio frequency amplifier applications, due to its high frequency range, low capacitance, and depletion-mode operation. It is especially popular for use in satellite receivers, where low noise is important, as well as motor control circuits and high-frequency switching applications. Its small package size and wide temperature range also make it an ideal choice for use in space applications, where it must be able to withstand extreme temperatures.

In summary, the 2N5485 is a Motorola field-effect transistor designed primarily for use as a low-noise amplifier in radio receivers. Its depletion-mode operation, low-capacitance characteristics, and wide frequency range make it ideal for use in RF amplifier applications. Its small size and wide temperature range make it an excellent choice for space applications. The 2N5485 is a great choice for any application where a low-noise, high-performance amplifier is required.

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