BC549 Transistor TO92 CDIL NPN Transistor 549 CDIL BC549

Product Overview:

A through-hole NPN silicon epitaxial planar small-signal bipolar junction transistor housed in a standard TO-92 plastic package. The BC549 is specifically engineered for high-gain, ultra-low-noise applications. Due to its superior noise performance, it is the industry-standard choice for the input stages of high-fidelity audio preamplifiers, microphone preamplifiers, and sensitive signal-processing equipment where signal integrity is critical. It is the NPN counterpart to the BC559 PNP transistor.

Core Specifications:

• Manufacturer: CDIL (Continental Device India Limited)

• Package Type: TO-92

• Function: NPN Low-Noise Small-Signal Transistor

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

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

• Maximum Collector Power Dissipation ($P_C$): 500mW (at ambient temperature $T_a = 25^\circ\text{C}$)

• Common Marking Code: BC549 (often followed by a gain group suffix like A, B, or C)