What occurs at the EB Junction of an NPN transistor during cutoff?

What occurs at the EB Junction of an NPN transistor during cutoff?

• A. The junction is forward biased
• B. The junction is neutral
• C. The junction is reversed biased
• D. The junction no longer conducts

Answer: (C)

During the cutoff region of an NPN transistor, the EB (Emitter-Base) junction becomes reverse-biased. This occurs when the base-emitter voltage is insufficient to allow current to flow through the device. In this state, the minority charge carriers within the base are pulled away from the junction, creating a depletion region that effectively prevents any significant current flow. This is a defining characteristic of the cutoff operation mode, where the transistor acts like an open switch, ceasing to allow current to travel from the collector to the emitter. The reverse bias at the EB junction is crucial for the functioning of the transistor as it determines when the device will stop conducting, allowing for effective control in electronic circuits.

During the cutoff region of an NPN transistor, the EB (Emitter-Base) junction becomes reverse-biased. This occurs when the base-emitter voltage is insufficient to allow current to flow through the device. In this state, the minority charge carriers within the base are pulled away from the junction, creating a depletion region that effectively prevents any significant current flow. This is a defining characteristic of the cutoff operation mode, where the transistor acts like an open switch, ceasing to allow current to travel from the collector to the emitter. The reverse bias at the EB junction is crucial for the functioning of the transistor as it determines when the device will stop conducting, allowing for effective control in electronic circuits.