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What will be the thermal voltage of the diode if the temperature is 300K?

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What will be the thermal voltage of the diode if the temperature is 300K?

(a) 25.8 mV

(b) 50 mV

(c) 50V

(d) 19.627 mV

The question was asked in an internship interview.

My query is from Diode Resistance topic in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

1 Answer

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Right answer is (a) 25.8 mV

Explanation: The thermal voltage of the diode is given by, VT = KT/q, by substituting the values of T, K which is Boltzmann constant and q which is the charge of the electron we get VT = (300*1.38*10^-23)/ (1.602*10^-19), VT= 25.8mV.

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