2N3791

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The 2N3791 Transistor is a general-purpose, medium-power bipolar junction transistor (BJT) that can act as a switch or an amplifier in electronic devices. It is one of the most popular and affordable BJT devices, and from a functional perspective works identically to other common devices such as the 2N2222A, 2N3904 and 2N3906 components. As such, it is relatively straightforward and easy to replace these other devices with the 2N3791 for a variety of applications.

As a single BJT it is normally configured to provide one of two basic switching operations: switching digital logic signals as a digital switch or amplifying analog signals from a power source as an amplifier. In both cases it works by controlling the voltage and current flow through it under different configurations. The 2N3791 can also be used as a medium-power low-noise amplifier device when bias conditions are added.

Application field and Working Principle

The 2N3791 is considered a general-purpose transistor for applications such as audio, if and radio frequency (RF) amplifiers, preamplifiers, low-noise audio preamplifiers, and similar fields. Due to its comparatively low price and easy availability, it is popular among hobbyists who build their own electronic devices. Its operating voltage range is wide enough to support a variety of transistor-based designs.

The working principle of this BJT device is relatively simple and follows common BJT designs. As a two-terminal device (collector and emitter) it relies on the injected bias current and the electrical field between the two terminals to either create or break a circuit. When no current is flowing, the open circuit between the terminals prevents the current from flowing. When the Collector-Emitter voltage is applied and exceeds the threshold voltage, electrons will flow and cause current to flow through the transistor.

The amount of current sustained by the transistor can be controlled by varying the Collector-Emitter voltage, which is referred to as the bias voltage. In addition, by using an accompanying Resistor-Capacitor filter circuit, the transistor can be configured to respond differently to a given waveform. This combination of biasing and filtering can be used to amplify small input waveforms, such as those from a microphone, increase lower frequency waveforms, or any range of other waveform manipulation.

In terms of gain, the 2N3791 Transistor has an approximated gain of up to 50 times, depending upon configuration and input waveform. As it is a small BJT device its output is limited, however it is still capable of driving a small to moderate output current of up to 500mA. As with all BJT-based devices the 2N3791 is susceptible to thermal runaway, which is why manufacturers advise that the transistor be mounted on a heat sink.

Overall, the 2N3791 Transistor is an affordable and widely used BJT device that can provide two key functions: a switch to control the flow of current and a medium-power amplifier. In its basic configuration, it can be used for switching voltage and current in digital or analog applications, or can be configured as a low-noise amplifier with bias conditions. In any application it provides reliable switching at low cost.

The specific data is subject to PDF, and the above content is for reference