Question

Reverse collector saturation is greater than Reverse saturation current because reverse collector saturation __________

(a) Is ideal

(b) Consist leakage current flowing through junction and surface

(c) Doesn’t include avalanche multiplication current opposing collector current

(d) They are same

This question was posed to me at a job interview.

My query is from Operating Point of Transistor topic in portion Transistor Biasing and Low Frequencies of Analog Circuits

Answer 1

Correct choice is (b) Consist leakage current flowing through junction and surface

For explanation: One of the reasons why reverse collector current exceeds the reverse saturation current is the introduction of avalanche multiplication current in the base collector junction. This happens when high energy electron collides in the lattice it creates more number of electron and thus a greater current. Another major reason is the presence of surface leakage currents flowing in the reverse collector saturation.