![]() It is formed by sandwiching P-layer between N-layers. It is made up of two P-layers and one N-layer. It is made of a combination of two N-layers and one P-layer. The following comparison table shows some of the key differences between a PNP and NPN transistor. Key Difference between NPN & PNP Transistor Difference Between 8085 & 8086 Microprocessor – Comparison.Difference Between Microprocessor and Microcontroller.It shows an arrowhead pointing inwards showing the direction of the current flowing inside the emitter towards the collector terminal. The symbol of the PNP transistor is different from NPN. Therefore, the PNP transistor has a low switching speed. ![]() Since the majority charge carriers are holes, the recovery time of the PNP transistor is comparatively high. PNP transistor switches on when a negative voltage is applied to the base region and switches off when a positive voltage is applied. This current is due to the presence of majority charge carrier holes. Consequently, the current from the emitter will start to flow towards the collector. As the base has electrons as majority carriers, the holes will combine with the electrons and cause them to penetrate the depletion region. The minority charge carriers in the collector and emitter are electrons while in the base are holes.Īpplying a negative voltage to the base with respect to the emitter will push holes into the base region. The Collector and emitter have holes as majority charge carriers while the Base has electrons as the majority charge carrier. The middle N-layer is called base while the other two layers are called collector and emitter. The thin N-layer is sandwiched between two thick P-layers. The PNP Transistor is formed by the combination of 2 P-Type layers and 1 N-Type layer. Thyristor and Silicon Controlled Rectifier (SCR) – Thyristors Applications.It leads to the NPN having a very small switch ON and Switch OFF time, therefore offering a very high switching speed. Since the majority charge carriers are electrons and they are fast, the recovery time of the NPN transistor is fast. NPN transistor switches ON by applying a positive voltage at the base terminal while switches off by applying low voltage 0v at the base terminal. Therefore, the majority charge carrier in the NPN transistor is electrons while the minority carrier holes. The little arrowhead pointing outwards of the emitter shows the current direction going outward of the emitter.Īs the majority of charge carriers in the collector and emitter are the electrons and they are responsible for the flow of current. The symbol of the NPN transistor also is used to identify the direction of the current. While the current is directly proportional to the base current. Therefore, in the NPN transistor, applying a positive pulse at the base causes a current which is in the direction from the collector to the emitter. As it is thin and lightly doped, the electrons combine with holes resulting in penetration in the depletion region that causes the electrons to flow from the collector terminal to the emitter terminal. Applying a positive voltage with respect to the emitter will push electrons in the base (p-region). The base is a thin P-Type layer having the majority of holes. On the contrary, the collector and emitter has holes as minority charge carrier while the base has electrons as minority charge carriers. The Collector and emitter has electron as majority charge carriers while the Base has holes has majority charge carriers. The three terminals Collector, Base and Emitter each rise from N, P and N-Type material respectively. One of the N-regions which is the thickest layer of all but is lightly doped is called collector while the other N-region is the comparatively thinner but heavily doped as compared to the collector is called emitter. The central P-region is the thinnest layer of all which is also known as the Base. where the P-Type material is sandwiched between these two N-Type. Properties & Characteristics of PNP & NPN TransistorsĪn NPN Transistor is formed by the combination of two N-Type materials and one P-Type material.Key Difference between NPN & PNP Transistor.
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