Datasheet
:
BC548
is general purpose silicon, NPN, bipolar junction transistor. It is used for
amplification and switching purposes. The current gain may vary between 110 and
800. The maximum DC current gain is 800.
Its
equivalent transistors are 2N3904 and 2SC1815. These equivalent transistors
however have different lead assignments. The variants of BC548 are 548A, 548B
and 548C which vary in range of current gain and other
characteristics.
The
transistor terminals require a fixed DC voltage to operate in the desired region
of its characteristic curves. This is known as the biasing. For amplification
applications, the transistor is biased such that it is partly on for all input
conditions. The input signal at base is amplified and taken at the emitter.
BC548 is used in common emitter configuration for amplifiers. The voltage
divider is the commonly used biasing mode. For switching applications,
transistor is biased so that it remains fully on if there is a signal at its
base. In the absence of base signal, it gets completely
off.
Pin
Diagram :
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