What is the voltage drop between the base and emitter of a silicon NPN transistor in Saturation?
Also, there is a voltage drop between the Base and the Emitter terminal of about 0.7v (one diode volt drop) for silicon devices as the input characteristics of an NPN Transistor are of a forward biased diode.
Can current flow from emitter to collector in NPN?
The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). The base still controls current flow, but that current flows in the opposite direction — from emitter to collector.
Can current flow from base to collector?
Current also flows from base to collector. Hopefully, that is also straightforward. In both cases, current is flowing across a forward biased junction when the transistor is in saturation. Due to transistor action, current also flows from collector to emitter.
How is the n-p-n transistor different from other transistors?
From the circuit diagram of the n-p-n transistor, it is seen that the emitter-base circuit is forward biased while the collector-emitter circuit is reverse biased. Due to the forward bias, the majority charge carriers in the emitter are repelled towards the base.
What makes a bipolar junction transistor a PNP or NPN?
A bipolar junction transistor is formed by three layers of semiconductor materials, if it is a PNP transistor, it will have two P-type regions and one N-type region, likewise, if it is an NPN transistor, it will have two N-type regions and one P-type region. Transistors have three terminals namely emitter, collector and base.
Who are the minority charge carriers in an n-p-n transistor?
In an n-p-n transistor, the majority of the charge carriers are electrons and holes are the minority charge carriers. A small amount of current at the base terminal causes a large amount of current to flow from emitter to collector. The figure below represents the circuit diagram of the n-p-n transistor:
How does a transistor work like a closed switch?
The transistors act like a closed switch. RR – In this case, both the junctions are reverse biased. The emitter does not supply the majority charge carriers to the base because of which the carrier current is not collected by the collector. Thus, transistors, in this case, acts like an open switch.