The BC548B-B1 is a NPN bipolar transistor manufactured by Taiwan Semiconductor. It is a single transistor packaged in a TO-92 form-factor and features a rated current of 0.1A, a collector-emitter voltage of 30V, and a DC current gain of up to 400. It is suitable for use as a general-purpose amplifier and as a switch, and is often used in circuits with low-level audio, oscillators, and general-purpose amplifiers. It can also be used as an electronic switch in applications such as relays, timers, and logic circuits. Additionally, due to its low-cost and low-power dissipation, it is ideal for use in integrated circuits and consumer electronics.