PNP
The symbol of a PNP Bipolar Junction Transistor.
The other type of BJT is PNP, consisting of the layer of N-doped semiconductor between 2 layers of P-doped material. A small current leaving base is amplified in the collector output. This means that, a PNP transistor is "on" when its base is pulled low relative to emitter.
The arrows in NPN and PNP transistor symbols are on emitter legs and point in direction of the conventional current flow when the device is in the forward active mode.
A mnemonic device for NPN / PNP distinction, based on arrows in their symbols and the letters in their names, is not pointing in for the NPN and pointing in for PNP.
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