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PDF LM199 Data sheet ( Hoja de datos )
| Número de pieza | LM199 | |
| Descripción | Precision Reference | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM199 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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May 1999
LM199/LM299/LM399/LM3999
Precision Reference
General 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 al-
lows 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 ordi-
nary monolithic zeners. The package is supplied with a ther-
mal shield to minimize heater power and improve tempera-
ture regulation.
The LM199 series references are exceptionally easy to use
and free of the problems that are often experienced with or-
dinary 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.
The LM199 can be used in almost any application in place of
ordinary zeners with improved performance. Some ideal ap-
plications are analog to digital converters, calibration stan-
dards, precision voltage or current sources or precision
power supplies. Further in many cases the LM199 can re-
place references in existing equipment with a minimum of
wiring changes.
The LM199 series devices are packaged in a standard her-
metic 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.
The LM3999 is packaged in a standard TO-92 package and
is rated from 0˚C to +70˚C
Features
n Guaranteed 0.0001%/˚C temperature coefficient
n Low dynamic impedance — 0.5Ω
n Initial tolerance on breakdown voltage — 2%
n Sharp breakdown at 400 µA
n Wide operating current — 500 µA to 10 mA
n Wide supply range for temperature stabilizer
n Guaranteed low noise
n Low power for stabilization — 300 mW at 25˚C
n Long term stability — 20 ppm
n 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)
n Certified long term stability available
n MIL-STD-883 compliant
Connection Diagrams
Metal Can Package (TO-46)
Plastic Package TO-92
DS005717-14
Top View
LM199/LM299/LM399 (See Table on fourth page)
NS Package Number H04D
DS005717-10
Bottom View
LM3999 (See Table on fourth page)
NS Package Number Z03A
© 1999 National Semiconductor Corporation DS005717
www.national.com
1 page  
Typical Characteristics
National Semiconductor
Certified Long Term Drift
Hrs Drift
168 −20
336 −24
504 −36
672 −34
840 −40
1008
−36
Testing Conditions
Heater Voltage: 30V
Zener Current: 1 mA
Ambient Temp.: 25˚C
Typical Performance Characteristics
Reverse Characteristics
Reverse Voltage Change
DS005717-12
Dynamic Impedance
Zener Noise Voltage
DS005717-19
Stabilization Time
DS005717-20
Heater Current
DS005717-21
DS005717-22
DS005717-23
DS005717-24
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number LM299H, LM399H, LM199AH, LM199AH/883
LM299AH or LM399AH
NS Package H04D
Plastic Package
Order Number LM3999Z
NS Package Z03A
11
www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM199.PDF ] | |
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