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When the temperature in a MOSFET increases: resistance increases and mobility decreases thus avoiding thermal runaway compared to BJT.

But what is the reason for increasing resistance and decreasing mobility in MOSFET?

I thought before that it will be opposite: as temperature increases, mobility of electrons will be excited(increase) no matter what semiconductor we have thus resistance will also decrease. Why does the opposite happens in a MOSFET?

hontou_
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    Does this answer your question? [MOSFET Temperature coefficient](https://electronics.stackexchange.com/questions/310704/mosfet-temperature-coefficient) – Kent Altobelli May 25 '20 at 02:47
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    See also [this answer on the Spirito effect](https://electronics.stackexchange.com/questions/472375/heat-dissipation-calculation-for-mosfet/472587#472587) – Andy aka May 25 '20 at 08:37
  • From what I recall, the automotive manufacturers found a **CHANGE** in the MOSFET temp_coeff about 30 years ago, based on how the FETS are constructed. I think there is a NASA JPL paper or POWERPOINT explaining why the change. – analogsystemsrf May 25 '20 at 02:19

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