Here are a few possible replacements for 2N3904:īC547: This is a general-purpose NPN bipolar junction transistor with a similar package and pinout as 2N3904. It has a maximum collector current of 200mA and a maximum collector-emitter voltage of 40V. Its small size and wide range of applications make it an essential component in many electronic circuits.ĢN3904 is a widely used general-purpose NPN bipolar junction transistor that is commonly used in amplification and switching applications. Overall, the 2N3904 is a widely used transistor due to its low cost, availability, and versatility. Its high transition frequency makes it suitable for use in high-frequency applications, while its low input and output capacitances make it ideal for use in circuits where fast switching is required. The 2N3904 can be used in a variety of electronic circuits, such as amplifiers, switch drivers, and general-purpose switching applications. Some of the technical specifications of the 2N3904 are:Ĭollector-Emitter Saturation Voltage: 0.2V It is a small signal transistor with a maximum collector current of 200 mA and a maximum collector-emitter voltage of 40 V. NPN silicon epitaxial planar transistor for switching and Amplifier applicationsĢN3904 is a commonly used NPN bipolar junction transistor (BJT) in electronic circuits for amplification and switching applications. NPN Silicon Transistor (General small signal application) Darlington Pairs - It can be used in Darlington Pairs.NPN SILICON PLANAR EPITAXIAL SWITCHING TRANSISTORS. Sensor Circuits - It can be used in sensor circuits.Home Appliances -It is suitable for home appliances e.g television.Fast Switching - It can be used as fast switching.Automatic Switching - It can be used where automatic switching is required.Amplifier Modules - It can be used as amplifier modules such as Audio amplifiers, signal amplifiers etc.Load Switch - It can be used as a minimum load switch having less saturation voltage and maximum gain.When it is acting as an amplifier, the DC gain of the transistor can be calculated by the following formula ĭC Current Gain = Collector Current (IC) / Base Current (IB) The configurations used in the amplifier circuit are It acts as amplifier while operating in an active region. The transistor can amplify the power, current and voltage at different configurations. This is why a resistor is connected in series with the base pin. The current at the base pin should me 5mA maximum more than it will destroy the transistor. When we provide the required amount of current at the base pin, the transistor will be an open switch when it is forward biased and it will e a closed switch when it is reverse biased. When a transistor is working as a switch, it works on two modes saturation region and cut off the region as explained earlier.
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