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LMT87: Clarification on Reliability/Functional Safety of non Automotive TO-92 package

Neet
Intellectual 622 points

Part Number: LMT87

Tool/software:

Hello E2E Community,

We are considering the TO-92 Package of the LMT87 sensors for our remote temperature sensing use case for bearing temperature monitoring.

I however would like to know if this package is suitable for a use case with more than 99% lifetime temperature exposure to 80'C inside lubrication oil tank (the sensor shall be safe inside a SS probe & no direct oil contact)

I noticed that the automotive version of the same sensor in another package is Functional Safety Capable - but this industry grade version did not have any mention of this.

Our design life is 20k hours or ~2 years after which we change the sensors.

Your guidance shall be valuable for our use case.

  • +1
    TI__Expert 7180 points

    Hi Neet,

    There are 2 things to consider here: functional safety and reliability.

    • When it comes to functional safety, the device offers an FS report which contains the required information to be able to pursue any safety standards as needed at a system level. If your application requires compliance to FuSa, then I would recommend using the -Q1 device since this is the part number that contains the information and engineering assessment for FIT and FMD.
    • To answer your question on the 80°C average exposure temperature, this is where reliability comes into play, you can expect similar performance from either device since they have both been tested according to JESD22-A108 --> HTOL at 125°C for 1000hrs. Using Arrhenius equation to calculate the acceleration factor, this is equivalent to around 45k hours of use at 80°C. 
    • Only the -Q1 device is FuSa capable. Keep in mind that the -Q1 device comes in a DCK package only rather than T0-92.

    I would also recommend for future reference to check out TI's qual summaries for any device in the following page.

    Best regards,

    Simon Rojas