What is reverse saturation current of a transistor?
In a PNP transistor, the reverse saturation current (ICBO) will comprises of the current due to the holes passing through the collector junction from the base to collector region (IhCO) and the current due to the electrons which are passing through the collector junction in the opposite direction (IeCO).
What is the formula for reverse saturation current?
Hint: We know that the current that flows in reverse bias PN junction diode is called reverse saturation current. From the diode current equation I=Is(eVηVT−1) the current should decrease as the temperature is increased but the opposite happens.
What is reverse saturation current in a BJT?
The saturation current (or scale current), more accurately the reverse saturation current, is that part of the reverse current in a semiconductor diode caused by diffusion of minority carriers from the neutral regions to the depletion region. This current is almost independent of the reverse voltage. (
What is reverse current in transistor?
Reverse Current When ON In an NPN transistor, the Base is at a positive bias, the Collector at a negative bias, and reverse current flows from the Emitter to the Collector. Therefore, C and E can be used as a transistor, even when connected in reverse. In this case current will flow from E to C. 3.
What is the reason for reverse saturation current?
The reverse saturation current is the part of the reverse current in a semiconductor diode which is caused by the diffusion of minority carriers from the neutral regions to the depletion region.
Why it is called reverse saturation current?
This current is usually very small (interms of micro amp to nano amp). Since this current is due to minority carriers and these number of minority carriers are fixed at a given temperature therefore, the current is almost constant known as reverse saturation current ICO.
What is the unit of reverse current?
The units frequently used to measure the forward bias and reverse bias current of a diode are. µA and µA respectively.
How does reverse saturation change with temperature?
Reverse saturation current (IS) of diode increases with increase in the temperature the rise is 7%/ºC for both germanium and silicon and approximately doubles for every 10ºC rise in temperature. Thus if we kept the voltage constant, as we increase temperature the current increases.
Why reverse current is called reverse saturation current?
What is leakage current in reverse biased?
Reverse leakage current in a semiconductor device is the current from that semiconductor device when the device is reverse biased. Hence, it is also called reverse saturation current. The term is particularly applicable to mostly semiconductor junctions, especially diodes and thyristors.
Why current is low in reverse bias?
A diode (PN junction) in an electrical circuit allows current to flow more easily in one direction than another. The voltage with reverse biasing doesn’t cause any appreciable current to flow. When the voltage is applied in the opposite direction across the diode, the depletion region shrinks.