A40 BC549C NPN Low Noise Transistor, 30V 100mA, TO-92 Package, High Current Gain (hFE) for Audio Preamps

The BC549C is a premium small-signal NPN transistor designed for use in low-noise stage amplifiers. While it shares a similar footprint with the standard BC548, the BC549C is specifically screened for its Low Noise Figure, making it the ideal choice for processing weak analog signals. The "C" suffix denotes the highest gain classification ($h_{FE}$), ensuring maximum sensitivity and amplification for your circuit.

Key Technical Specifications

• Transistor Type: NPN

• Collector-Emitter Voltage ($V_{CEO}$): 30V

• Collector Current ($I_C$): 100mA (Continuous)

• Current Gain ($h_{FE}$): 420 to 800 (Category C - High Gain)

• Noise Figure: Extremely low (typically 1.2 dB to 4 dB)

• Package Type: TO-92 (Through-hole)

• Transition Frequency ($f_T$): 300MHz (Typical)

Applications

• Hi-Fi Audio Preamplifiers: Essential for the input stages of phono preamps, microphone mixers, and guitar pedals.

• Low-Level Signal Processing: Amplifying weak sensor outputs without adding background "hiss" or distortion.

• Instrumentation: Precision measurement circuits requiring stable, high-gain amplification.

• Tape Head Amplifiers: Classic component for vintage audio restoration and repair.

Why Choose the BC549C?

• Superior Audio Fidelity: Specifically designed to minimize electronic noise, ensuring a crystal-clear signal path.

• Maximum Gain: The "C" grade classification provides a significantly higher gain than "A" or "B" versions, allowing for fewer amplification stages in a design.

• Standard Pinout: Drop-in compatibility with other BC5xx series transistors (C-B-E configuration).

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