BC108 NPN Metal Transistor 20V 100mA TO-18

Description

BC108 NPN Metal Transistor 20V 100mA TO-18 The BC108 is a silicon planar epitaxial NPN bipolar transistor housed in a TO-18 metal can. It is optimized for low-noise, small-signal applications (audio preamps, input stages, oscillators) and offers stable DC gain and good frequency response in compact through-hole form. The metal package gives better thermal conduction and mechanical robustness compared with plastic packages, which helps reliability in hand-built and professional analog circuits. Because the BC108 is specified for low currents and modest voltages it is ideal for pre-amplifier stages, driver stages and general purpose signal processing where low noise and predictable gain are important. Its straightforward pinout and long history in vintage and educational designs make it a common choice for repairs, hobby projects and low-power analog designs. Features: Low noise performance suitable for audio and input stages. Stable DC current gain with grouped hFE options. Metal TO-18 package for improved heat dissipation. Good small-signal frequency response. Robust mechanical package for through-hole assembly. Widely available and easy to source for repairs and prototypes. Specifications: Parameter Value Device type: NPN bipolar transistor Package: TO-18 (metal can) Collector-Base breakdown (VCBO): 30V Collector-Emitter breakdown (VCEO): 20V Emitter-Base breakdown (VEBO): 5V Max collector current (IC): 100mA Power dissipation (Ptot): 0.3W (Ta ≤ 25°C) / 0.75 W (Tc ≤ 25°C) DC current gain (hFE): Groups: A/B/C (ranges 110–450 depending on group and test) Transition frequency (fT): ~150MHz (small-signal) Input capacitance (CCBO): ~4–6pF Storage temperature: −55°C to +175°C Max junction temperature (Tj): 175°C Pinout: Pin Number Pin Name 1 Emitter 2 Base 3 Collector Case Collector Applications: Audio input and pre-amplifier stages. Small-signal amplification (sensors, instrumentation). Oscillators and signal-processing circuits. Low-power switching and driver stages (relays, small loads). Repair and restoration of vintage electronics. Educational electronics and prototyping. Packages: 1x BC108 Datasheet.

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