BC549 NPN Transistor Pinout Datasheet

Introduction

The BC549 NPN transistor is a widely used small-signal transistor designed for low-noise audio amplification and general-purpose switching applications. It belongs to the BC54x transistor family and is most commonly preferred in audio circuits, preamplifiers, and signal processing due to its excellent noise performance. With a maximum collector-emitter voltage of 45V and a collector current rating of 100mA, the BC549 is ideal for low to medium power applications in analog and digital circuits.

The BC549 is available in three gain group classifications: BC549A, BC549B, and BC549C, where each version provides a different range of DC current gain (hFE). This feature allows designers to choose the appropriate type based on the amplification requirements of their circuit. Its typical transition frequency of 100 MHz also makes it suitable for high-frequency small-signal applications such as oscillators and RF modules.

BC549 NPN Silicon Transistor

Due to its low cost, reliability, and availability, the BC549 NPN transistor is extensively used in educational electronics, DIY projects, and industrial circuit designs. Its compact TO-92 package makes it easy to mount on breadboards and PCBs, making it an excellent choice for beginners and professionals alike.

BC549 Pinout

BC549 Transistor Key Features

• NPN silicon planar epitaxial transistor.
• Low noise figure for audio and RF applications.
• TO-92 plastic package.
• Reliable for low-power amplification and switching.

Specifications/Characteristics of BC549 NPN Transistor

• Maximum Collector-Base Voltage (Vcb): 50V
• Maximum Collector-Emitter Voltage (Vce): 45V
• Maximum Emitter-Base Voltage (Veb): 5V
• Maximum Collector Current (Ic): 100mA
• Power Dissipation (Ptot): 500mW
• DC Current Gain (hFE): 110 – 800
• Transition Frequency (ft): 100 MHz (typical)
• Noise Figure: Low (optimized for audio)
• Operating Junction Temperature: -65°C to +150°C
• Package Type: TO-92

BC549 Pin Configuration

More Circuit Layouts

Key Applications of BC549 NPN Transistor

• Low-noise audio preamplifiers.
• General-purpose signal amplification.
• Switching small loads up to 100mA.
• Sensor interface and signal conditioning.
• Oscillators and waveform generator circuits.
• RF modules and communication circuits.
• LED drivers and small control circuits.

PNP Complimentary Transistor

PNP Complementary of BC549 Transistor is BC559.

EquivalentTransistors of BC549

• BC546 (higher voltage, 65V).
• BC547 (general-purpose, 45V).
• BC548 (general-purpose, 30V).
• 2N3904 (NPN small-signal transistor).
• 2N2222 (higher current handling).
• S8050 (economical alternative).

(Pin configuration of some transistors mentioned here may different from BC549).

Datasheet of BC549 NPN Transistor

Click the following Button below to download the datasheet of BC549 Transistor :

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