Albacete

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 1Ω dynamic impedance the device operates over a current range
of 400µA 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
sensors the LM135 has a linear output.
Applications for the LM135 include almost any type of temperature sensing over a −55˚C to +150˚C temperature
range. The low impedance and linear output make interfacing to readout or controlcircuitry 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
n
n
n
n
n
n
n

Directlycalibrated in ˚Kelvin
1˚C initial accuracy available
Operates from 400 µA to 5 mA
Less than 1Ω dynamic impedance
Easily calibrated
Wide operating temperature range
200˚C overrange
Low cost

Schematic Diagram

DS005698-1

© 2000 National Semiconductor Corporation

DS005698

www.national.com

LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors

November 2000LM135/LM235/LM335, LM135A/LM235A/LM335A

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

www.national.com

DS005698-26
DS005698-25

Order Number LM335M
See NS Package
Number M08A

2

*Case is connected to negative pin

Bottom View
OrderNumber LM135H,
LM135H-MIL, LM235H,
LM335H, LM135AH,
LM235AH or LM335AH
See NS Package
Number H03H

Continuous

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
Forward Current
Storage Temperature
TO-46 Package
TO-92 Package
SO-8 Package

Intermittent(Note 2)
150˚C to 200˚C
125˚C to 150˚C
100˚C to 125˚C

LM135, LM135A −55˚C to +150˚C
LM235, LM235A −40˚C to +125˚C
LM335, LM335A −40˚C to +100˚C
Lead Temp. (Soldering, 10 seconds)
TO-92 Package:
TO-46 Package:
SO-8 Package:
Vapor Phase (60 seconds):
Infrared (15 seconds):

15 mA
10 mA
−60˚C to +180˚C
−60˚C to +150˚C
−65˚C to +150˚C

260˚C
300˚C
300˚C
215˚C
220˚CTemperature Accuracy (Note 1)
LM135/LM235, LM135A/LM235A
Parameter

Conditions

LM135A/LM235A

LM135/LM235

Units

Min

Typ

Max

Min

Typ

Max

2.97

2.98

2.99

2.95

2.98

3.01

V

TC = 25˚C, IR = 1 mA

0.5

1

1

3

˚C

Uncalibrated Temperature Error

TMIN ≤ TC ≤ TMAX, IR = 1 mA

1.3

2.7

2

5

˚C

Temperature Error with 25˚C

TMIN ≤ TC≤ TMAX, IR = 1 mA

0.3

1

0.5

1.5

˚C

Operating Output Voltage

TC = 25˚C, IR = 1 mA

Uncalibrated Temperature Error

Calibration
Calibrated Error at Extended

TC = TMAX (Intermittent)

2

2

˚C

Temperatures
Non-Linearity

IR = 1 mA

0.3

0.5

0.3

1

˚C

Temperature Accuracy (Note 1)
LM335, LM335A
Parameter

Conditions

LM335A

LM335Units

Min
Operating Output Voltage

Max

Min

Typ

Max

2.95

2.98

3.01

2.92

2.98

3.04

V

1

TC = 25˚C, IR = 1 mA

Uncalibrated Temperature Error

Typ

3

2

6

˚C

TC = 25˚C, IR = 1 mA

Uncalibrated Temperature Error

TMIN ≤ TC ≤ TMAX, IR = 1 mA

2

5

4

9

˚C

Temperature Error with 25˚C

TMIN ≤ TC ≤ TMAX, IR = 1 mA

0.5

1...