BC109 NPN General Purpose Transistor 25V 200mA TO -18 Metal Package

BC109 NPN General Purpose Transistor 25V 200mA TO – 18 Metal Package

The BC109 is a low-noise NPN general-purpose transistor designed for audio frequency and small-signal amplification.
It operates with a collector-emitter voltage of 25V and a collector current of up to 200mA, offering excellent gain stability, low noise, and reliable performance.
Encased in a rugged TO-18 metal package, the BC109 ensures superior thermal stability, durability, and long service life, making it ideal for high-quality audio circuits, low-level signal amplification, and general-purpose electronic designs.

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Features

• NPN Bipolar Junction Transistor (BJT) – designed for low-level signal applications
• Voltage Rating: 25V (Collector-Emitter)
• Current Rating: 200mA continuous collector current
• Low Noise and High Gain: Ideal for sensitive audio applications
• TO-18 Metal Package: Provides excellent heat dissipation and mechanical strength
• Wide Frequency Response: Suitable for high-fidelity and precision circuits
• Stable and Reliable Operation: Consistent performance across temperature ranges
• RoHS Compliant: Environmentally safe and lead-free

Applications

• Audio preamplifiers and tone control circuits – low-noise signal amplification
• Small-signal amplification – for analog and instrumentation systems
• Oscillator and waveform generation circuits – stable frequency response
• Switching circuits – for low-current control tasks
• Sensor and detector circuits – accurate, low-noise signal processing
• Educational and hobby electronics – easy to use for general-purpose circuits
• Vintage audio and classic electronic equipment – ideal replacement component

bc109-transistor-datasheet