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What will be the approximate value of thermal voltage of diode?

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What will be the approximate value of thermal voltage of diode?

(a) 25mV at 300K

(b) 30mV at 180K

(c) 25mV at 180K

(d) 30mV at 300K

I had been asked this question in semester exam.

My doubt stems from Diode Resistance in division Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Correct option is (a) 25mV at 300K

The explanation: We know that the thermal voltage of diode is approximately equal to room temperature which is 300K then for all practical purpose the thermal voltage of diode is taken as 25mV so it will be 25mV at 300K.

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