About 2N3903

The 2N3903 is a small signal NPN bipolar junction transistor (BJT) that belongs to the renowned 2N3904 family. Encased in a TO-92 package, it is primarily designed for general-purpose switching and amplification applications. With a maximum collector-to-emitter voltage of 40V and a maximum collector current of 200mA, this transistor offers sufficient power handling capabilities for various circuit requirements.

Featuring a DC current gain ranging from 20 to 150, the 2N3903 ensures efficient signal amplification. Additionally, it boasts a maximum noise figure of 6.0dB, indicating relatively low levels of internal noise. The transistor’s maximum transition frequency of 250MHz implies its ability to operate effectively at high frequencies.

With a power dissipation rating of 625mW, the 2N3903 can handle moderate power levels without risking damage or degradation. Overall, the 2N3903 provides a reliable and versatile solution for common switching and amplification needs, making it a popular choice among electronic enthusiasts and professionals alike.

Features

• Small signal NPN BJT: It is a small signal NPN bipolar junction transistor, ideal for low-power applications that require amplification or switching.
• TO-92 package: Encased in a TO-92 package, this transistor is compact and easy to integrate into electronic circuits.
• Power handling capabilities: With a maximum collector-to-emitter voltage of 40V and a maximum collector current of 200mA, it can handle a wide range of circuit requirements.
• DC current gain: The transistor features a DC current gain ranging from 20 to 150, ensuring efficient signal amplification.
• Low internal noise: Boasting a maximum noise figure of 6.0dB, the 2N3903 offers relatively low levels of internal noise, enhancing signal clarity.
• High-frequency operation: The transistor’s maximum transition frequency of 250MHz indicates its ability to operate effectively at high frequencies, making it suitable for applications that require fast switching or high-frequency amplification.
• Power dissipation rating: With a power dissipation rating of 625mW, it can handle moderate power levels without risking damage or degradation.

Specifications

Applications

• Switching circuits: The 2N3903 is commonly used in general-purpose switching applications where low-power signals need to control higher power loads.
• Amplification circuits: Due to its small signal characteristics and efficient signal amplification capabilities, it finds application in various audio and low-power amplification circuits.
• Oscillators and RF circuits: With its high-frequency operation and low internal noise, it is suitable for use in oscillators and radio frequency (RF) circuits that require stable and clean signal generation.
• Signal processing: The transistor can be utilized in signal processing circuits, such as filters and equalizers, to manipulate and enhance signals with low power requirements.
• General-purpose electronics: Given its versatility and popularity, the 2N3903 can be found in a wide range of general-purpose electronic circuits, including logic gates, sensors, and control systems.

Datasheet Download: 2N3903 Datasheet

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