LM199, LM299, LM399, LM3999
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SNVS751C –MAY 2004–REVISED APRIL 2005
LM199/LM299/LM399 Precision Reference
Check for Samples: LM199, LM299, LM399, LM3999
The LM199 series references are exceptionally easy
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FEATURES
to use and free of the problems that are often
experienced with ordinary zeners. There is virtually
no hysteresis in reference voltage with temperature
cycling. Also, the LM199 is free of voltage shifts due
to stress on the leads. Finally, since the unit is
temperature stabilized, warm up time is fast.
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0.0001%/°C Temperature Coefficient
Low Dynamic Impedance — 0.5Ω
Initial Tolerance on Breakdown Voltage — 2%
Sharp Breakdown at 400 μA
Wide Operating Current — 500 μA to 10 mA
Wide Supply Range for Temperature Stabilizer
Low Noise
The LM199 can be used in almost any application in
place of ordinary zeners with improved performance.
Some ideal applications are analog to digital
converters, calibration standards, precision voltage or
current sources or precision power supplies. Further
in many cases the LM199 can replace references in
Low Power for Stabilization — 300 mW at 25°C
Proven Reliability, Low-Stress Packaging in
TO-46 Integrated-Circuit Hermetic Package, for
Low Hysteresis after Thermal Cycling. 33
Million Hours MTBF at TA = +25°C (TJ = +86°C)
existing equipment with
changes.
a
minimum of wiring
The LM199 series devices are packaged in a
standard hermetic TO-46 package inside a thermal
shield. The LM199 is rated for operation from −55°C
to +125°C while the LM299 is rated for operation from
−25°C to +85°C and the LM399 is rated from 0°C to
+70°C.
DESCRIPTION
The LM199 series are precision, temperature-
stabilized monolithic zeners offering temperature
coefficients a factor of ten better than high quality
reference zeners. Constructed on a single monolithic
chip is a temperature stabilizer circuit and an active
reference zener. The active circuitry reduces the
dynamic impedance of the zener to about 0.5Ω and
allows the zener to operate over 0.5 mA to 10 mA
current range with essentially no change in voltage or
temperature coefficient. Further, a new subsurface
zener structure gives low noise and excellent long
term stability compared to ordinary monolithic zeners.
The package is supplied with a thermal shield to
minimize heater power and improve temperature
regulation.
Connection Diagram
Figure 1. Metal Can Package (TO-46) Top View
Package Number NER0004D
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004–2005, Texas Instruments Incorporated