Description

The 2N3905 is a PNP bipolar junction transistor (BJT) commonly used for general-purpose applications such as switching and amplification. It is part of the widely popular 2N390x transistor family and is designed for low-power electronic circuits.

Encased in a compact TO-92 package, the transistor is easy to handle and suitable for breadboard prototyping and PCB designs. It supports a maximum collector current of approximately 200mA and a collector-emitter voltage of up to -40V, making it ideal for small signal applications.

The 2N3905 provides a moderate current gain (hFE typically between 40 and 160), allowing it to amplify weak signals effectively while also functioning as a switch in digital circuits.

As a PNP transistor, it operates by allowing current flow when the base voltage is lower than the emitter, making it suitable for high-side switching and complementary designs alongside NPN transistors like the 2N3904.

It offers fast switching speeds and low noise performance, making it suitable for audio, signal processing, and control circuits.

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Key Applications

• Signal amplification circuits
• Low-power switching applications
• Audio preamplifiers
• Arduino and microcontroller interfacing
• Complementary transistor circuits (with 2N3904)
• Educational and DIY electronics projects

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Key Features

• Type: PNP Bipolar Junction Transistor (BJT)
• Package: TO-92 (3-pin)
• Collector Current (Ic): up to 200mA
• Collector-Emitter Voltage (Vce): up to -40V
• DC Gain (hFE): 40–160
• Low noise and fast switching
• Suitable for low-power applications
• Compact and easy to integrate