The LM329 is a precision multi-current temperature-compensated 6.9V zener reference with
dynamic impedance a factor of 10 to 100 less than discrete diodes. Constructed in a single silicon
chip, the LM329 uses active circuitry to buffer the internal zener allowing the device to operate
over a 0.5 mA to 15 mA range with virtually no change in performance. The LM329 is available with a
temperature coefficients of 0.01%/°C. This reference also has excellent long term stability and low
A new subsurface breakdown zener used in the LM329 gives lower noise and better long-term
stability than conventional IC zeners. Further the zener and temperature compensating transistor
are made by a planar process so they are immune to problems that plague ordinary zeners. For
example, there is virtually no voltage shift in zener voltage due to temperature cycling and the
device is insensitive to stress on the leads.
The LM329 can be used in place of conventional zeners with improved performance. The low
dynamic impedance simplifies biasing and the wide operating current allows the replacement of many
The LM329 for operation over 0°C to 70°C is available in a TO-92 epoxy package.
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