LM50

·Calibrated directly in degree Celsius (Centigrade)
·Linear + 10.0 mV/°C scale factor
·±2°C accuracy guaranteed at +25°C
·Specified for full −40° to +125°C range
·Suitable for remote applications
·Low cost due to wafer-level trimming
·Operates from 4.5V to 10V
·Less than 130 µA current drain
·Low self-heating, less than 0.2°C in still air
·Nonlinearity less than 0.8°C over temp

·Computers
·Disk Drives
·Battery Management
·Automotive
·FAX Machines
·Printers
·Portable Medical Instruments
·HVAC
· Power Supply Modules

Supply Voltage ................................................................................+12V to −0.2V
Output Voltage ....................................................................(+V_S + 0.6V) to −1.0V
Output Current ............................................................................................10 mA
Storage Temperature ...............................................................−65°C to +150°C
Lead Temperature:
SOT Package (Note 2):
Vapor Phase (60 seconds) ..........................................................................215°C
Infrared (15 seconds) .................................................................................220°C
TJMAX, Maximum
Junction Temperature .................................................................................150°C
ESD Susceptibility (Note 3):
Human Body Model ......................................................................................2000V
Machine Model ...............................................................................................250V

The LM50 is a precision integrated-circuit temperature sensor that can sense a −40°C to +125°C temperature range using a single positive supply.

The LM50's output voltage is linearly proportional to Celsius (Centigrade) temperature (+10 mV/°C) and has a DC offset of +500 mV. The offset allows reading negative temperatures without the need for a negative supply.

The ideal output voltage of the LM50 ranges from +100 mV to +1.75V for a −40°C to +125°C temperature range. The LM50 does not require any external calibration or trimming to provide accuracies of ±3°C at room temperature and ±4°C over the full −40°C to +125°C temperature range. Trimming and calibration of the LM50 at the wafer level assure low cost and high accuracy.

The LM50's linear output, +500 mV offset, and factory calibration simplify circuitry required in a single supply environment where reading negative temperatures is required. Because the LM50's quiescent current is less than 130 µA, self-heating is limited to a very low 0.2°C in still air.