BC550 NPN Transistor Pinout Datasheet

Introduction

The BC550 NPN transistor is a popular small-signal, low-noise transistor commonly used in audio frequency amplification and switching circuits. It is designed for applications where low noise and high gain are essential, making it suitable for preamplifiers, audio input stages, and high-fidelity sound systems. With a maximum collector-emitter voltage of 45V and a collector current rating of 100mA, the BC550 is ideal for low-power and medium-voltage circuits.

The transistor is available in gain group classifications: BC550A, BC550B, and BC550C, with DC current gain (hFE) ranging from 110 to 800. This classification allows circuit designers to select the right version depending on their amplification requirements. Its high transition frequency of 300 MHz (typical) makes it suitable for high-speed switching and RF applications, providing excellent performance in sensitive electronic designs.

BC550 NPN Silicon Transistor

Due to its reliability, noise reduction capabilities, and compact TO-92 package, the BC550 transistor is widely used in consumer electronics, audio amplifiers, oscillators, sensors, and hobby projects. It is a go-to choice for engineers and students building signal amplification circuits with minimum distortion and maximum efficiency.

BC550 Pinout

BC550 Transistor Key Features

• NPN silicon planar epitaxial transistor.
• Very low noise figure, optimized for audio applications.
• Package type: TO-92.
• Reliable performance in low-power circuits.

Specifications/Characteristics of BC550 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
• Total Power Dissipation (Ptot): 500mW
• DC Current Gain (hFE): 110 – 800
• Transition Frequency (ft): 300 MHz (typical)
• Noise Figure: Very low (ideal for audio)
• Operating Temperature Range: -65°C to +150°C
• Package: TO-92 plastic

BC550 Pin Configuration

More Circuit Layouts

Key Applications of BC550 NPN Transistor

• Low-noise audio frequency amplifiers.
• General-purpose signal amplification.
• High-gain audio preamplifiers.
• RF circuits and high-frequency signal processing.
• Oscillator and waveform generator circuits.
• Switching small loads and LED drivers.
• Sensor interface circuits.

PNP Complimentary Transistor

PNP Complementary of BC550 Transistor is BC560.

EquivalentTransistors of BC550

• BC546 (higher voltage, 65V).
• BC547 (general-purpose, 45V).
• BC548 (general-purpose, 30V).
• BC549 (low-noise, 45V).
• 2N3904 (NPN general-purpose).
• 2N2222 (higher current handling).

(Pin configuration of some transistors mentioned here may different from BC550).

Datasheet of BC550 NPN Transistor

Click the following Button below to download the datasheet of BC550 Transistor :

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