BC107 Pinout, Equivalent, Application, Datasheet

The BC107 is a widely used NPN bipolar junction transistor known for its stability, reliability, and low-noise performance in analog and switching circuits. In this article, we explain its working principle, detailed BC107 pinout, features, specifications, applications, and equivalents. This guide helps students, hobbyists, and engineers understand how the BC107 performs in practical low-power amplification and switching tasks.

Introduction

The BC107 is a general-purpose NPN transistor commonly used in low-power audio amplification, switching tasks, and signal-processing applications. Its high gain, good frequency response, and robust performance make it ideal for many analog circuits. Due to its classic TO-18 metal package, the BC107 is known for reliability and excellent thermal stability.

Pin Configuration / Pinout of BC107 Transistor

Understanding the BC107 Pinout Configuration

The BC107 comes in a TO-18 metal can package with 3 terminals: emitter, base, and collector.

Note: DATASHEET DOWNLOAD button is provided end of this article.

BC107 Key Features

• General-purpose NPN transistor
• Suitable for low-noise amplification
• Fast switching response
• Low leakage and stable operation
• Reliable metal can (TO-18) package
• High DC current gain range
• Widely used in analog and hobby circuits

BC107 Specifications/Characteristics

• Transistor type: NPN bipolar junction transistor
• Collector-emitter voltage (Vceo): 45V
• Collector-base voltage (Vcbo): 50V
• Emitter-base voltage (Vebo): 6V
• Continuous collector current (Ic): 100mA
• Peak collector current (Icm): 200mA
• Total power dissipation (Ptot): 300mW
• Junction temperature (Tj max): 175°C
• Storage temperature (Tstg): –65°C to +150°C
• DC current gain (hFE): 110 to 450
• Transition frequency (fT): 100MHz
• Package type: TO-18 metal can

Key Applications of BC107 Transistor

• Audio preamplifier stages
• General-purpose switching
• Oscillator and waveform circuits
• Sensor and signal-conditioning circuits
• Transistorized hobby projects
• Low-power driver circuits
• Small analog amplifier circuits

BC107 Equivalent / Alternatives

(Verify pin compatibility before using substitutions)

Common equivalents and replacements:

• BC108
• BC109
• BC547 (plastic package alternative)
• 2N2222
• 2N3904
• BC237 / BC238 series

More Circuit Layouts

Working Principle of BC107

The BC107 operates as a current-controlled NPN transistor where a small base current controls a larger collector current. When the base-emitter junction is forward-biased, the transistor enters active mode and amplifies signals. In saturation mode, it works as an ON switch, while in cutoff mode, it behaves as an open circuit. Its high gain and good high-frequency response make it suitable for low-noise preamplifiers, oscillators, and general switching circuits.

Frequently Asked Questions (FAQ)

Q1: Is BC107 good for audio amplification?
Yes, due to low noise and high gain, it works well in preamplifier stages.

Q2: What package does BC107 use?
It comes in a metal TO-18 package.

Q3: Can I replace BC107 with BC547?
Yes, BC547 is a common replacement with similar characteristics.

Q4: Is BC107 suitable for switching?
Yes, it can switch low-power loads efficiently.

Q5: What is the difference between BC107 and BC109?
BC109 offers lower noise, making it suitable for premium audio applications.

Conclusion

The BC107 is a reliable and versatile NPN transistor widely used in low-power switching, audio amplification, and signal applications. With its stable performance, broad gain range, and classic metal package, it remains a popular choice for both educational and professional circuits. Understanding the BC107 pinout, specifications, and working principle helps in designing efficient and noise-free analog projects.

Datasheet of BC107 Transistor

Click the following Button below to download the datasheet of BC107 :

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