Zener diode temp coefficient #1082
Replies: 3 comments
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The Zener diode model is deficient. I found a similar diode that has a more complete model. On a side note: The term "Zener" diode is ONLY valid for diodes say 5 Volts or less. Diodes > 5 Volts are actually Avalanche diodes. You can tell by the "knee" of the breakover region and the Tempco. Zener diodes have a "soft" knee while Avalanche diodes have a "sharp" knee. Manufacturers used to sell "Voltage Reference" diodes that consisted of multiple dies in series in a package to achieve specific a voltage and Tempco. IC voltage references killed that market.
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Thanks, it seems the models from Diodes Inc. are useless in the tempco context. |
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Search OnSemi for the model. Tempco is meaningless for most uses of Zener diodes. That is especially so for ones with soft knees. The days of using precision Voltage Reference diodes ended decades ago. They are still used in legacy designs especially for the Military. Some would be used in ovens like a crystal to make a stable reference. ICs came out in the 1980's that were better. https://www.raffia.ch/content/datasheets/volume03/1N823_AppNotes_Motorola.pdf |
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Hi,
I am trying to simulate the behaviour of a zener diode, BZT52C3V0.
It is specified to have a negative temperature coefficient (-3.5mV/C), but the voltage goes up with increasing temperature.
Is this normal?
I would expect the voltage to go down with increasing temperature.
Is there something wrong in the spice lib file?
DIODES-BZT52CXVX.pdf
BZT52C3V0.spice.lib.zip
zenertest.sch.zip
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