BC108 NPN General Purpose Transistor

BC108 NPN General Purpose Transistor – TO-18 Metal Can Package

The BC108 is a classic NPN bipolar junction transistor widely used in low noise, general-purpose amplification and switching applications. Its TO-18 metal can package ensures mechanical robustness and thermal stability, making it a go-to component for analog circuit designs, hobby electronics, and vintage restorations.

🔧 Key Features

• Transistor Type: NPN Bipolar Junction Transistor (BJT)

• Package: TO-18 metal can – compact, heat-resistant, and ideal for precision circuits

• Function: Signal amplification and switching

• Low Noise Performance: Excellent for audio and RF preamp stages

• Easy Integration: Standard Emitter–Base–Collector pin configuration for breadboards and PCBs

📐 Technical Specifications

• Collector-Emitter Voltage (V_CE) Max: 30V

• Collector-Base Voltage (V_CB) Max: 45V

• Emitter-Base Voltage (V_EB) Max: 5V

• Collector Current (I_C) Max: 100mA

• Power Dissipation (P_D): 300 mW

• DC Current Gain (h_FE): 110 – 800 (varies by model)

• Transition Frequency (f_T): 150 MHz

• Operating Temperature Range: –65°C to +150°C

🛠️ Typical Applications

• Audio signal amplification (preamps and tone control circuits)

• Signal switching for small loads (LEDs, relays)

• Analog hobby projects and educational kits

• RF circuits and test signal generators

• Legacy electronics repairs (vintage radios, amps)

✅ Advantages

• Low noise operation for clean audio and signal processing

• Stable gain across wide temperature ranges

• Metal can construction for better shielding and durability

• Ideal for both prototyping and production use in analog electronics