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LMT87: Effects of Induction Heating on Temperature Sensors

Chris Gray14
Prodigy 180 points
Part Number: LMT87

I want to test a temperature sensor by heating it to 100 Celsius and above, possibly using an induction heating module.

I am concerned there may be immediate and long term negative effects on the sensor and its output signal. Can anyone offer advice here please?

The sensor is an LM87QDCK (smd). The induction heating module is the popular 'Low Voltage 120W ZVS PSU and heating coil' found on ebay.

I am housing the sensor in a stainless steel tube 5mm diameter, this will be inserted into the coil, which will be operated at a reduced power.

The whole of the sensor will be in the induction zone, inserted for about a minute.

I wonder if the output signal of the sensor IC will be affected by the inducted energy.

Also, if any effects will be only found after a long period - shortened life for example.

This is a picture of one of the induction heaters:

  • 0
    TI__Mastermind 30685 points

    Hi Chris,

    LMT87 is rated for 150C operation. It's true that high temperature does theoretically reduce the lifespan of an IC, but we don't have further guidance or derating for LMT87. All of our IC are subjected to industry standard testing for lifetime, which includes accelerated aging at high temperature (HTOL.) You can view the TI Quality report for LMT87 here and the automotive-grade LMT87-Q1 here. The devices are required to meet their specifications after stress testing is applied. 

    Regarding the induction, we don't perform testing to detect if an IC is vulnerable to such an environment. I can only guess that the PCB would be more susceptible to issues than the IC itself due to the scale of the conduction paths. Our sensing element is semiconductor based; it will not react with induction any differently than an IC without a temperature sensor inside.

    thanks,

    ren

  • 0 in reply to Ren Schackmann
    Prodigy 180 points

    Thanks Ren,

    The scale of conduction paths.. this may be OK yes. High currents can be induced but mainly if those conductive paths are large. The sensor PCB traces might be much more vulnerable

  • 0 in reply to Chris Gray14
    TI__Mastermind 30685 points

    Hi Chris, Did you have any further questions?

    thanks,

    ren

  • +1 in reply to Ren Schackmann
    Prodigy 180 points

    I'll close the issue Ren, thank you. No further questions on this