2N2222 is an NPN transistor hence
the collector and emitter will be left open (Reverse biased) when the base pin
is held at the ground and will be closed (Forward biased) when a signal is
provided to the base pin. 2N2222A has a gain value of 110 to 800, this value
determines the amplification capacity of the transistor. The maximum amount of
current that could flow through the Collector pin is 800mA, hence we cannot
connect loads that consume more than 800mA using this transistor. To bias a
transistor we have to supply current to the base pin, this current (IB) should be limited to 5mA.
When
this transistor is fully biased, it can allow a maximum of 800mA to flow across
the collector and emitter. This stage is called Saturation Region and the
typical voltage allowed across the Collector-Emitter (VCE) or Base-Emitter (VBE) could be 200
and 900 mV respectively. When the base current is removed the transistor
becomes fully off, this stage is called the Cut-off Region, and the Base
Emitter voltage could be around 660 mV.
Applications
·
Can
be used to switch high-current (up to 800mA) loads
·
It
can also be used in various switching applications.
·
Speed
control of Motors
·
Inverter
and other rectifier circuits
· Can be used in Darlington Pair.
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