MRF428

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MRF428 is a bipolar technology radio frequency (RF) application transistor that is used for various power amplification and switching applications in television and automotive electronics.

This transistor is built on a silicon substrate and is capable of operating in the 0–50 volt range at frequencies of up to 10 GHz. It features a maximum continuous current-drain of 350 mA and a maximum power rating of 28 watts.

The MRF428 is a two-port device, with its input port controlling the output port. The transistor consists of two identical transistors, each with its own emitter, collector and base terminals. The two transistors are connected to one another by a common collector. This arrangement allows the current that is drawn from the emitter of the first transistor to be diverted directly to the base of the second without going through an external resistor.

The main function of the MRF428 is to convert signals which exist in the form of voltage or current into analog electrical signals, which can then be amplified and unscrambled by the downstream circuits. This device is also useful for limiting the current in a circuit and is sometimes used to protect sensitive circuits from too much current.

The working principle behind the operation of the MRF428 is the same as with other bipolar junction transistors (BJTs): a base current, controlled by the input signal, controls the current gain of the device.

The base terminal is supplied with a voltage, either from a signal source or from a resistor, which creates a small electric field that attracts and holds electrons. The number of electrons held by the base terminal determines the current gain of the transistor and is, therefore, governed by the voltage applied to the base terminal.

The MRF428 also has two other terminals, the emitter and the collector. When a signal is applied to the base terminal, electrons are drawn from the emitter to the collector, while the base voltage maintains the current gain of the transistor. This change in the current between the emitter and collector causes the output signal, which is taken from the collector terminal, to be amplified.

For optimal performance, the MRF428 should be operated in an environment that is free from any electromagnetic interference (EMI). Since this transistor operates in the microwave frequency range, it is important to ensure that the environment is kept free from any significant sources of EMI, including other electronic devices or high-powered sources such as lights or appliances.

The MRF428 is an ideal device for use in various applications due to its high current-drain, power rating, and operating frequency. Some common uses for the MRF428 include:

• Television receivers and video monitors
• RF amplifiers
• Television signal scramblers
• RF signal switchers
• Radio transceivers
• Automotive electronics

The MRF428 is a versatile RF application transistor that is used in numerous commercial and industrial applications. This transistor device is implemented with a two-port design, which delivers both current gain and voltage gain, increasing the effectiveness of the overall design. Its enhanced capability makes it useful for a wide range of applications, from television receivers to automotive electronics.

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