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No. Semiconductor has negative temp coefficient, because increase in temp causes the increase in the k.e of the electrons bu t not in the no of electrons . these highly energised electronsel increase current, & in terms conductivity.

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13y ago
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13y ago

A: It is positive However for a diode it may reach zero but at a point not reasonable to be useful

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11y ago

positive, which is why they can easily self destruct

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12y ago

negative

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Q: What is the temperature coefficient of BJT?
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Related questions

What happens when the temperature of a forward biased diode is increased?

What happens depends on the temperature coefficient of the diode. If that diode has a positive temperature coefficient, it resistance increases with increased temperature. A diode with a negative temperature coefficient does the opposite.


What is the difference between positive and negative temperature coefficient of resistance?

Negative temperature coefficient of resistance means that as the temperature of a piece of wire or a strip of semiconducting material increases, the electrical resistance of that material decreases.


Does a safe reactor have a positive or negative 'temperature coefficient of reactivity'?

negative 'temperature coefficient of reactivity'


How the coefficient of viscosity of a liquid changes with temperature?

The coefficient of viscosity of liquids decreases with an increases in temperature.


How diffusion coefficient depends on temperature?

The diffusion coefficient depends on temperature in direct negative exponent.


Fullform of ntc and ptc?

ntc: negative temperature coefficient ptc: positive temperature coefficient


What is temperature cofficient in pn junction?

Temperature coefficient of the PN intersection voltage to balance the temperature coefficient of the warm voltage.


What is the relationship between resistance and temperature?

• ntc 'negative temperature coefficient': its resistance decreases as the temperature increases• ptc 'positive temperature coefficient': its resistance increases as the temperature increases


What is the main advantage of an fet transistor over a bjt transistor?

BJT & FET parameters are temperature dependent. In BJT the collector junction resistance decreasing ( collector current increasing) with temperature raise.Due to the highe temperature & current transistor will damage quickly. In FET drain resistance increasing (drain current decreasing ) with increasing temperature.Due to this property it will not damage easily. We can say from the above two statements FET is more temperature stable.FET can use in highe temperature applications.


What is the difference between PTC and NTC resistors?

positive temperature coefficient vs. negative temperature coefficient resistance increases or decreases with increase of temperature, respectively.


What is thermal runaway in BJT?

Thermal runaway is where the biasing and operating point is such that the temperature causes the gain to increase, which causes the temperature to increase, which causes the gain to increase, in a vicious circle, leading to destruction of the BJT. Proper biasing and gain management can prevent this from occurring.


Why semiconductor has negative temperature coefficient of resistance?

Actually, the BJT is a positive temperature coefficient device. As they get warm, hFe increases, causing more current flow. This can lead to thermal runaway. That is why most class A common emitter configurations use an emitter resistor to place limits on the hFe demand, eliminating thermal drift and runaway.