LM235A

Features:

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




Specifications

Reverse Current 15 mA
Forward Current 10 mA
Storage Temperature
TO-46 Package −60°C to +180°C
TO-92 Package −60°C to +150°C
SO-8 Package −65°C to +150°C
Specified Operating Temp. Range
Continuous Intermittent
(Note 2)
LM135, LM135A −55°C to +150°C 150°C to 200°C
LM235, LM235A −40°C to +125°C 125°C to 150°C
LM335, LM335A −40°C to +100°C 100°C to 125°C
Lead Temp. (Soldering, 10 seconds)
TO-92 Package: 260°C
TO-46 Package: 300°C
SO-8 Package: 300°C
Vapor Phase (60 seconds): 215°C
Infrared (15 seconds):220°C

Temperature Accuracy (+/-)	1 deg C
Supply Min	5 Volt
Quiescent Current_	1000 uA
Temperature Min	-40 deg C
Temperature Max	125 deg C
Sensor Gain	10 mV/Deg K
Single Supply	Yes
Output Impedance	0.5 Ohm
Quiescent Current	1 mA
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Description

The LM235A 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 1W dynamic 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 sensors the LM135 has a linear output.

Applications for the LM235A 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 control circuitry especially easy.

The LM235A 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.