2N3904 PDF Datasheet – 40V, 200mA, NPN Switching Transistor

This post explains for the NPN Switching Transistor.

The Part Number is 2N3904.

The function of this semiconductor is NPN Switching Transistor

Manufacturer: Philips, NXP


2N3904 transistor


The 2N3904 is a small signal NPN bipolar junction transistor (BJT) that is commonly used in electronic circuits due to its low cost and wide availability.

This is NPN switching transistor in a TO-92; SOT54 plastic package. PNP complement: 2N3906.

1. What is the maximum voltage rating ?
The maximum voltage rating is 40V.

2. What is the maximum current rating?
The maximum current rating is 200mA.

3. What is the typical current gain?
The typical current gain is 100. However, it can vary depending on the specific manufacturer and operating conditions.


1. Low current (max. 200 mA)
2. Low voltage (max. 40 V).


2N3904 pinout datasheet


1. Collector-base voltage open emitter : VCBO = 60 V
2. Collector-emitter voltage open base : VCEO = 40 V
3. Emitter-base voltage open collector ; VEBO = 6 V
4. Collector current (DC) : IC = 200 mA
5. Peak collector current : ICM = 300 mA
6. Peak base current : IBM = 100 mA
7. Total power dissipation (Tamb ≤ 25 °C) : Ptot = 500 mW


1. Low cost: Low-cost transistor that is widely available.
2. High gain: High current gain, which makes it suitable for use in amplifier circuits.
3. High frequency response: A high transition frequency (ft), which makes it suitable for use in oscillator circuits and high-frequency applications.
4. Low noise: Low noise characteristics, which makes it suitable for use in audio amplifier circuits.


1. Low maximum current ratings: Maximum current rating of 200mA, which limits its use in high-power applications.

2. Limited temperature range: The component has a limited temperature range, and its performance may be affected at high temperatures.

3. Sensitivity to ESD: The Sensitive to electrostatic discharge (ESD), which can damage the transistor during handling and assembly.

4. Limited frequency response at high currents: Limited frequency response at high currents, which can affect its performance in certain applications.


1. High-speed switching.

Parts similar to 2N3904:

1. BC547: NPN Transistor
2. BC337
3. PN2222
4. 2SC945

2N3904 PDF Datasheet

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