Transistor 2N3905 PNP 200mA 40V

Overview:Transistor 2N3905 PNP 200mA 40V

The Transistor 2N3905 is a PNP silicon bipolar junction transistor (BJT) designed for low-power amplification and general-purpose switching. It offers a collector current of 200mA and a collector-emitter voltage of 40V, making it suitable for a wide range of signal processing and control applications.
Moreover, the Transistor 2N3905 is known for its low noise characteristics, excellent linearity, and high gain stability, which make it an ideal component for audio amplifiers, sensor circuits, and instrumentation systems.
Consequently, it is a popular choice among engineers, technicians, and educators who value performance, reliability, and compact design in modern electronics.

Key Features

• Transistor Type: PNP

• Collector–Emitter Voltage (V_CEO): –40 V

• Collector–Base Voltage (V_CBO): –60 V

• Emitter–Base Voltage (V_EBO): –5 V

• Collector Current (I_C): –200 mA

• Power Dissipation (P_tot): 625 mW

• DC Current Gain (h_FE): 70 – 300

• Transition Frequency (f_T): 250 MHz typical

• Package Type: TO-18 Metal Can

Additionally, the Transistor 2N3905 provides excellent frequency response and low collector-emitter saturation voltage, ensuring energy efficiency and consistent performance across a wide temperature range. Its metal TO-18 package offers superior heat dissipation and long-term durability.

Typical Applications

The Transistor 2N3905 is commonly used in:

• Audio amplifier input and driver stages

• Signal amplification and filtering

• Switching control in low-power circuits

• Sensor and analog signal conditioning

• Low-current voltage regulators

• Complementary pairing with NPN transistor 2N3904 for push-pull amplifiers

Furthermore, its fast switching speed and low leakage current make it suitable for both analog and digital signal circuits, ensuring accurate and stable performance.

Electrical Characteristics (at T_a = 25 °C)

Advantages

• Low noise performance ideal for high-fidelity audio circuits.

• High transition frequency for fast signal response.

• Excellent gain stability for consistent amplification.

• Durable TO-18 metal package provides superior heat dissipation.

• Moreover, the Transistor 2N3905 ensures efficient operation, long lifespan, and wide application compatibility, making it an excellent component for both industrial and educational use.

Summary

In summary, the Transistor 2N3905 is a versatile, low-power PNP transistor that excels in signal amplification, switching, and control applications. With a 200mA current rating, 40V voltage capability, and high-frequency response, it offers excellent balance between reliability and performance.
Therefore, whether used in audio equipment, sensor modules, or low-current power systems, the Transistor 2N3905 remains a trusted and efficient component for high-quality electronic designs.