PNP transistor A two-junction (bipolar) semiconductor transistor with a P-type collector and emitter, and an N-type base. In such a device, the current amplification arises from the injection of holes from the emitter into the base, and their subsequent collection in the collector. A PNP transistor is formed by introducing a thin region of N-type semiconductor material between two regions of P-type material.                A PNP transistor is "triggered" when its base is pulled low. Go here for more details on transistors in general; go here for a discussion of transistor usage in BEAM robots. Compare to NPN transistor. Note that both PNP and NPN are TLAs.

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