Untitled image by E2m (Own work), via Wikimedia Commons “The basic operation of an NPN BJT in Active mode” by Inductiveload (Own drawing, done in Inkscape), via Wikimedia Commons Switching Time:Īn NPN transistor has a faster switching time compared to a PNP transistor. The majority carriers in a PNP transistor are holes. The majority carriers in an NPN transistor are electrons. Difference Between NPN and PNP Transistor Structure:Īn NPN transistor consists of a p-type semiconductor sandwiched between two n-type semiconductors.Ī PNP transistor consists of an n-type semiconductor sandwiched between two p-type semiconductors. called the DC Current Gain of the device and is given the symbol of hfe or nowadays Beta, (. A bipolar junction transistor is formed by three layers of semiconductor materials, if it is a p-n-p transistor, it will have two p-type regions and one n-type. We also learnt that the junctions of the bipolar transistor can be biased in one of three different ways Common Base. Both PNP and NPN transistors are composed of different materials and current flow of these transistors is also dissimilar. The most commonly used transistor configuration is the NPN Transistor. Transistor - PNP Transistor - PNP Transsitor - PNP PNP PhotoTransistor - PNP PhotoTransistor - PNP phototransistor, PNP Transistor - NPN Transistor. The PNP transistor functions similarly to two PN junction diodes connected back to back. A PNP transistor has three terminals: a Collector (C), an Emitter (E), and a Base (B) (B). They could be connected to a multimeter, and by looking at under which polarity the transistor conducts current, it is possible to determine the two types. That is: an NPN transistor and a PNP transistor types. A PNP transistor is a bipolar junction transistor composed of an N-type semiconductor sandwiched between two P-type semiconductors. arrow in the pnp symbol points away from the base. pnp symbol is an inverted version of the npn symbol. arrow in the pnp symbol points towards the base. npn symbol is always larger than the pnp symbol.

Otherwise, both transistors have similarities. The schematic symbol for a pnp transistor can always be distinguished from an npn transistor as the. It concludes that the main difference between NPN and PNP transistors is the use of biasing and current directions. This is all about the NPN vs PNP transistors. In most cases, it is not possible to differentiate between NPN and PNP transistors by just looking at them. PNP Transistor Tutorial - The Bipolar PNP Transistor Transistors Capital Electra X Symbols Bipolar Transistor BJT - University of Pittsburgh NPN and PNP. PNP transistor Symbol: In the PNP transistor symbol, the emitter terminal represents by the inward arrow.

Pnp symbol transistor