2N3904 BJT: Pinout, Datasheet, Alternative

The 2N3904 is a popular NPN bipolar junction transistor (BJT) commonly used in electronic circuits for general-purpose amplification and switching applications. It is designed for low to medium power amplification and features a maximum collector current of 200mA.

2N3904 Overview

The 2N3904 transistor is housed in a TO-92 package, which is a small, three-lead package with the collector, base, and emitter pins. It has a voltage rating of 40V for the collector-emitter voltage (Vce) and 60V for the collector-base voltage (Vcb). The maximum power dissipation is 625mW.

With a gain (hFE) ranging from 100 to 300, the 2N3904 offers moderate amplification capabilities. It has a low base-emitter saturation voltage (VBE) of around 0.65V, allowing for efficient switching operations. The transistor also features a fast switching speed and low noise characteristics.

Pinout

CAD-Model

2N3904 Application

The 2N3904 is widely used in various applications such as audio amplifiers, small signal amplification stages, switching circuits, and oscillator circuits. It can be found in a range of electronic devices, including consumer electronics, telecommunications equipment, and industrial control systems.

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