The typical value of diffusion capacitance is

Q.  The typical value of diffusion capacitance is ________
- Published on 20 Oct 15

a. 200 times CT
b. 300 times CT
c. 400 times CT
d. 500 times CT

ANSWER: 500 times CT
 
Typical value of transition or (Space-charge) capacitance is 40 pF while typical value of diffusion capacitance is 0.02 μF which is absolutely 500 times the value of transition capacitance. Diffusion capacitance occurs when the junction is forward biased. Diffusion or (Storage capacitance) is directly proportional to forward current & hence this capacitance finds a greater impact on the applications of devices where the necessity of switching arises from forward to reverse biased operating modes.

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