LM235A Sensors Datasheet

LM235A Datasheet, PDF, Equivalent


Part Number

LM235A

Description

Precision Temperature Sensors

Manufacture

National Semiconductor

Total Page 14 Pages
Datasheet
Download LM235A Datasheet


LM235A
May 1999
LM135/LM235/LM335, LM135A/LM235A/LM335A
Precision Temperature Sensors
General Description
The LM135 series are precision, easily-calibrated, integrated
circuit temperature sensors. Operating as a 2-terminal zener,
the LM135 has a breakdown voltage directly proportional to
absolute temperature at +10 mV/˚K. With less than 1dy-
namic impedance the device operates over a current range
of 400 µA to 5 mA with virtually no change in performance.
When calibrated at 25˚C the LM135 has typically less than
1˚C error over a 100˚C temperature range. Unlike other sen-
sors the LM135 has a linear output.
Applications for the LM135 include almost any type of tem-
perature sensing over a −55˚C to +150˚C temperature
range. The low impedance and linear output make interfac-
ing to readout or control circuitry especially easy.
The LM135 operates over a −55˚C to +150˚C temperature
range while the LM235 operates over a −40˚C to +125˚C
temperature range. The LM335 operates from −40˚C to
+100˚C. The LM135/LM235/LM335 are available packaged
in hermetic TO-46 transistor packages while the LM335 is
also available in plastic TO-92 packages.
Features
n Directly calibrated in ˚Kelvin
n 1˚C initial accuracy available
n Operates from 400 µA to 5 mA
n Less than 1dynamic impedance
n Easily calibrated
n Wide operating temperature range
n 200˚C overrange
n Low cost
Schematic Diagram
DS005698-1
© 1999 National Semiconductor Corporation DS005698
www.national.com

LM235A
Connection Diagrams
TO-92
Plastic Package
SO-8
Surface Mount Package
TO-46
Metal Can Package*
DS005698-8
Bottom View
Order Number LM335Z
or LM335AZ
See NS Package
Number Z03A
DS005698-25
Order Number LM335M
See NS Package
Number M08A
DS005698-26
*Case is connected to negative pin
Bottom View
Order Number LM135H,
LM135H-MIL, LM235H,
LM335H, LM135AH,
LM235AH or LM335AH
See NS Package
Number H03H
www.national.com
2


Features LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors May 1999 LM135/LM235/LM335, LM135A/LM235A/LM33 5A Precision Temperature Sensors Gener al Description The LM135 series are pre cision, easily-calibrated, integrated c ircuit temperature sensors. Operating a s a 2-terminal zener, the LM135 has a b reakdown voltage directly proportional to absolute temperature at +10 mV/˚K. With less than 1Ω dynamic impedance t he device operates over a current range of 400 µA to 5 mA with virtually no c hange in performance. When calibrated a t 25˚C the LM135 has typically less th an 1˚C error over a 100˚C temperature range. Unlike other sensors the LM135 has a linear output. Applications for t he LM135 include almost any type of tem perature sensing over a −55˚C to +15 0˚C temperature range. The low impedan ce and linear output make interfacing t o readout or control circuitry especial ly easy. The LM135 operates over a −5 5˚C to +150˚C temperature range while the LM235 operates over.
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