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LM335AZT Temperature Sensor Chip SENSOR ANALOG -40C-100C TO92-3
Features of LM335AZT
■ Directly calibrated in °K
■ 1°C initial accuracy
■ Operates from 450µA to 5mA
■ Less than 1Ω dynamic impedance
Description of LM335AZT
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.
Specifications of LM335AZT
Mfr | STMicroelectronics |
Series | - |
Product Status | Active |
Sensor Type | Analog, Local |
Sensing Temperature - Local | -40°C ~ 100°C |
Sensing Temperature - Remote | - |
Output Type | Analog Voltage |
Voltage - Supply | - |
Resolution | 10mV/°K |
Features | - |
Accuracy - Highest (Lowest) | ±3°C (±5°C) |
Test Condition | 25°C (-40°C ~ 100°C) |
Operating Temperature | -40°C ~ 100°C |
Mounting Type | Through Hole |
Package / Case | TO-226-3, TO-92-3 (TO-226AA) Formed Leads |
Supplier Device Package | TO-92-3 |
Base Product Number | LM335 |
Application information of LM335AZT
There is an easy method of calibrating the device for higher
accuracies
The single point calibration works because the output of the LM135,
LM235, LM335 is proportional to the absolute temperature with the
extrapolated output of sensor going to 0V at 0°K (-273.15°C).
Errors in output voltage versus temperature are only slope. Thus a
calibration of the slope at one temperature corrects errors at all
temperatures.
The circuit output (calibrated or not) is given by the equation:
VOT + VOTO x where T is the unknown temperature and To is the
reference temperature (in °K).
Nominally, the output is calibrated at 10mV/°K.
Precautions should be taken to ensure good sensing accuracy. As in
the case of all temperatures sensors, self-heating can decrease
accuracy. The LM135, LM235, and LM335 should operate with a low
current but sufficient to drive the sensor and its calibration
circuit to their maximum operating temperature
If the sensor is used in surroundings where the thermal resistance
is constant, the errors due to self-heating can be externally
calibrated. This is possible if the circuit is biased with a
temperature stable current. Heating will then be proportional to
Zener voltage and therefore temperature. In this way, the error due
to self-heating is proportional to the absolute temperature as
scale factor errors.
