BC549 NPN Transistor

Type: NPN (Negative-Positive-Negative) transistor: In NPN transistors like the BC549, current flows from the collector (C) to the emitter (E) when a small current is applied to the base (B).

Polarity: The BC549 is an NPN transistor, which means it amplifies or switches electronic signals with a positive voltage at the collector relative to the emitter.

Amplification: The BC549 has a moderate gain, typically ranging from 110 to 800. This makes it suitable for amplification purposes in small-signal applications.

Voltage Ratings: The transistor is often rated for a maximum collector-emitter voltage (VCEO) of around 30 to 50 volts and a collector current (IC) of up to 100 mA.

Package Type: The BC549 is available in various package types, including TO-92, which is a common through-hole package for easy mounting on a PCB.