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zahrein
Joined: 28 May 2004
Posts: 144
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 28 Aug 2004 5:01 Temperature coeffecient? |
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Does anyone know the temperature coefficients of the following integrated components?
diode (Voltage/Temperature)
base diffused resistor (Resistance/Temperature)
transistor hfe (gain/Temperature)
All are for bipolar IC process. Thanks.
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sergio mariotti
Joined: 22 Dec 2003
Posts: 454
Helped: 38
Location: Italy
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| 29 Aug 2004 18:22 Temperature coeffecient? |
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for Si diodes in the 40...400 K range and for small I (not self heating)
dV/dT= -2.2mV/K , (it is quasi costant).
For Hfe: I don'know the value but i know that it is positive. So it is a cause of desctructive chain reaction.
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djalli
Joined: 10 Nov 2001
Posts: 887
Helped: 15
Location: 1600 Pennsylvania Avenue, Washington DC 20500
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| 30 Aug 2004 4:42 Temperature coeffecient? |
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| This is really a strange question indeed. Some of information is different in different devices. Aren't they in datasheet of the device?
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echo47
Joined: 07 Apr 2002
Posts: 4205
Helped: 565
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| 30 Aug 2004 7:11 Temperature coeffecient? |
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Looks like another homework question from "Electronics Technology" class.
I enjoy helping students, but first I want to see some initiative!
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Kevin Weddle
Joined: 10 Jul 2004
Posts: 101
Location: San Antonio, TX
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| 31 Aug 2004 17:20 Re: Temperature coeffecient? |
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| I think semiconductors conduct more heavily when the temperature is increased. A capacitor loses capacitance, I believe. A resistor I am not sure of. This is a real good question. The beta of a transistor will change with temperature. That's why you should wait for the betas to stabilize when you first turn on the power to electronics.
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