BC549 Epitaxial Silicon NPN Transistor – TO-92 Package

The BC549 is a low-noise epitaxial silicon NPN bipolar junction transistor (BJT) designed for signal amplification and switching applications. Known for its excellent noise performance and high gain characteristics, it is widely used in audio preamplifiers, signal processing circuits, instrumentation equipment, sensor interfaces, and general-purpose electronic designs. The compact TO-92 package allows easy through-hole PCB mounting.

Key Features -

• Low-noise NPN transistor

• Epitaxial silicon transistor technology

• Suitable for amplification and switching applications

• High DC current gain (hFE)

• Compact TO-92 through-hole package

• Excellent performance in low-level signal circuits

• Reliable and stable operation

Specifications -

• Product type - Bipolar Junction Transistor (BJT)

• Part number - BC549

• Transistor polarity - NPN

• Technology - Epitaxial Silicon

• Package type - TO-92

• Mounting type - Through Hole

• Number of pins - 3

• Collector-Emitter Voltage (VCEO) - 30V

• Collector-Base Voltage (VCBO) - 30V

• Emitter-Base Voltage (VEBO) - 5V

• Maximum Collector Current (IC) - 100mA

• Power Dissipation - 500mW

• Transition Frequency (fT) - 150MHz

• Noise Figure - Low Noise Performance

• Operating Temperature Range - -55°C to +150°C

Applications -

• Audio preamplifiers and amplifier stages

• Low-level signal amplification

• Sensor interface circuits

• Instrumentation equipment

• Signal processing applications

• Switching circuits

• Educational and DIY electronics projects