2N3904 IC

The 2N3904 is not an integrated circuit (IC) but rather a small signal NPN bipolar junction transistor (BJT).

### Key Features:

– **Type**: NPN transistor

– **Maximum Collector Current (Ic)**: 200 mA

– **Maximum Collector-Base Voltage (Vcb)**: 40V

– **Maximum Collector-Emitter Voltage (Vce)**: 40V

– **Maximum Emitter-Base Voltage (Veb)**: 6V

– **Package Type**: TO-92 (through-hole), SOT-23 (surface mount)

### Applications:

– **Switching**: Used in low-power switching circuits.

– **Amplification**: Commonly used for amplifying signals in audio and other low-frequency applications.

– **Signal Processing**: Suitable for small signal amplification and signal processing in various electronic circuits.

### How It Works:

– **NPN Configuration**: The transistor has three terminals: the collector (C), the base (B), and the emitter (E). In an NPN transistor like the 2N3904, current flows from the collector to the emitter when a small current is applied to the base.

### Example Uses:

– **Darlington Pair**: Used in pairs for higher current amplification.

– **Inverter Circuits**: Basic logic circuits and signal inversion.

– **Audio Amplifiers**: Small-signal amplification in audio applications.

The 2N3904 is a widely used transistor due to its low cost, versatility, and availability, making it suitable for a variety of electronic projects and circuits.