Pnp Transistor Pin Diagram. Tip120 tip121 tip122 npn. Bc557 is a pnp transistor hence the collector and emitter will be closed forward biased when the base pin is held at ground and will be opened reverse biased when a signal is provided to base pin.
This is where a pnp transistor differs from a npn transistor a logic state blue colour is used to toggle between ground and signal voltage. The pnp transistor has very similar characteristics to their npn bipolar cousins except that the polarities or biasing of the current and voltage directions are reversed for any one of the possible three configurations looked at in the first tutorial common base common emitter and common collector. The operation of this circuit is very simple if the input pin of transistor base is connected to ground i e.
S8550 is a pnp transistor hence the collector and emitter will be left open reverse biased when the base pin is held at ground and will be closed forward biased when a signal is provided to base pin.
Tip125 tip126 tip127 pnp tip32 transistor overview. This is where a pnp transistor differs from a npn transistor a logic state blue colour is used to toggle between ground and signal voltage. Since it has high collector current of about 2a it can be used for power switching or large signal amplification the transistor is mainly known for its high amplification capacity since 2a is not much of a higher capacity. The pnp transistor symbol has an arrow pointing in.
