Precision temperature sensor
LM135-LM235-LM335
Precision temperature sensors
Features
■ Directly calibrated in °K ■ 1°C initial accuracy ■ Operates ...
Description
LM135-LM235-LM335
Precision temperature sensors
Features
■ Directly calibrated in °K ■ 1°C initial accuracy ■ Operates from 450µA to 5mA ■ Less than 1Ω dynamic impedance
Description
The LM135, LM235, LM335 are precision temperature sensors which can be easily calibrated. They operate as a 2-terminal Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/°K.
The circuit has a dynamic impedance of less than 1Ω and operates within a range of current from 450µA to 5mA without alteration of its characteristics.
Calibrated at +25°C, the LM135, LM235, and LM335 have a typical error of less than 1°C over a 100°C temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output.
TO-92 (Plastic package)
SO-8 (Plastic micropackage)
Pin connections
TO-92 (Bottom view)
ADJ v+ v-
SO-8 (Top view)
V+
NC
NC ADJ
8
7
6
5
1
2
3
NC NC
NC
4 V
-
February 2008
Rev 3
1/16
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Schematic diagram
1
Schematic diagram
Figure 1. Schematic diagram
LM135-LM235-LM335
2
Absolute maximum ratings
Table 1. Absolute maximum ratings (AMR)
Symbol
Parameter
LM135
LM235
LM335LM335A
Unit
Current
IR IF
Reverse Forward
Toper
Operating free-air temperature range(1)
Continuous Intermittent
Tstg Storage temperature range
1. Tj ≤ 150°C
15
mA
10
°C -55 to +150 -40 to +125 -40 to +100 +150 to +200 +125 to +150 +100 to +125
-65 to +150
°C
2/16
LM135-LM235-LM335
3
Temperature accuracy
Temperature accuracy
Tab...
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