2N5428

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Transistors - Bipolar (BJT) - Single

The 2N5428 is a general purpose, high-speed switching transistor that belongs to a series of PNP transistors. It features low saturation voltage and low collector-emitter saturation voltage, making it suitable for applications requiring high speed power switching such as power control and relay drivers. This device is also well-suited for general purpose switching, amplifier, and digital logic applications.

Application Field

The 2N5428 can be used in many applications, such as:

• Switching: The 2N5428 can be used for switching many kinds of load, such as light bulbs, motors, relay coils, solenoids, and other inductive loads.
• Amplification: The 2N5428 can be used to amplify both analog and digital signals.
• Power control: The 2N5428 can be used to control the power switch in power supply circuits and motor drive circuits.
• Surveillance applications: The 2N5428 can be used in applications requiring high speed switching, such as infrared and radar detectors.
• Telephone circuits: The 2N5428 can be used in telephone circuits for switching between receiver and microphone, and for signal modulation.

Working Principle

The 2N5428 is a PNP general purpose transistor which can be used in many applications. It operates in three modes: Cutoff mode, Active mode, and Saturation mode.

Cutoff Mode: In the Cutoff mode, the Collector-Base junction is reverse biased, meaning that the current flow is blocked. This is because the voltage between base and collector is greater than the base voltage being applied.

Active Mode: In the Active mode, the Collector-Base junction is forward biased and there is current flow through the transistor. The current is proportionate to the voltage applied to the base.

Saturation Mode: In the Saturation mode, the Collector-Base junction is forward biased and the current flow is maximized. This is because the voltage between base and collector is equal to the base voltage being applied.

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