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LM35: Can the LM35 suffer a low output voltage failure mode?

Part Number: LM35

Hi. We have a product in development that warms an object to a target temperature and maintains that temperature. We need to ensure that risk of the temperature increasing above a limit (e.g. > +41 deg C) is acceptably low. One potential failure mode we have identified is the single LM35 sending the temperature to the CPU being damaged or simply developing a fault so that the output is low, either with a DC offset or reduced gain. This would mean too much heat energy is applied and the temperature limit exceeded. We have not seen this failure and it is only a hypothetical risk. Can you please tell me if the LM35 is known to produce a low output voltage under any circumstances, such as ESD damage or other causes? For the record, our sensor is potted onto the monitored component and connected via a cable (tens of cm) to the control PCB and there to an ADC input via a series 2.2 kohms and 2.2 nF capacitor to 0V. 

  • Hi Ian,

    The LM35 is not known to produce a low output voltage but it is important to respect the ESD rating listed in the datasheet, among other specs. The LM35 output voltage will dip below 0V in cold environments so it would be important to make sure it stays above 0C for your team's application. 

    Best regards,