How will temperature affect the output of a semiconductor diode?

  • \$\begingroup\$ Reverse leakage current will also increase - many of the answers to this question will also apply to what you have asked here \$\endgroup\$ May 5, 2011 at 9:07
  • \$\begingroup\$ Many books could be written and armies of PhD students employed to investigate this problem as stated, and there would still be more to learn. What do you want to know about the effects of temperature on a diode? This question is overly broad, and could be closed. \$\endgroup\$ May 16, 2011 at 18:39
  • \$\begingroup\$ Also, I've removed your "Hi" and "Thanks" lines per the site guidelines. They are considered good manners in some contexts, but the Stack Exchange network is not one of these places: Here, they're noise and distract from the asking and answering of questions. Please don't do this in the future! <irony>Thanks!</irony> \$\endgroup\$ May 16, 2011 at 18:41

1 Answer 1


The forward voltage of a Si diode will drop by about 2.1 mV/°C (negative temperature coefficient, NTC). For a Ge diode this NTC is a bit higher at 2.5 mV/°C.
The effect is almost perfectly linear, so if you want you can make the diode a temperature sensor by supplying it with a constant current.

Reverse current increases exponentially with rising temperature. For a 1N4148 it increases tenfold for every 20°C temperature rise.

  • \$\begingroup\$ first of all , thanks for your answer.Lastly,I want to a question.What websites&books can you recommended related semiconductor devices? \$\endgroup\$
    – Cell-o
    Apr 18, 2011 at 9:44
  • \$\begingroup\$ @Cell-o - The question about electronics books has been asked a few times in the past, read e.g. electronics.stackexchange.com/questions/4795/… \$\endgroup\$
    – stevenvh
    Apr 18, 2011 at 9:51
  • \$\begingroup\$ @stevenvh, this is specifically for Si diodes, or does this apply to all diodes. \$\endgroup\$
    – Kortuk
    May 5, 2011 at 9:19
  • \$\begingroup\$ @Kortuk - this is for Si, I'll add this to the answer. Ge diodes have a higher tempco. Don't know the exact value though. \$\endgroup\$
    – stevenvh
    May 5, 2011 at 11:17
  • \$\begingroup\$ @Stevenvh, I was 99% sure of that, but thought I should ask, figured a short and sweet answer needed that added. \$\endgroup\$
    – Kortuk
    May 5, 2011 at 11:27

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