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TIC12400-Q1: what is maximum working altitude for this part? Is it usable into aerospace?

Miroslav Pajpach
Prodigy 55 points
Part Number: TIC12400-Q1

Hi,

I designing some device into aircraft and this part  looks very usable for us, but I need know answers for several questions.

1. Can you tell me what is maximum working altitude for this part?

2. if it is know, is there (if any) temperature derating when I use it for measure inputs up to 34V?  The power supply can be lower if it is needed for some reasons.

3. if it is know, is there (if any) temperature derating when the power supply will be 27V (up to33V)?

Thank you for answers.

Miroslav Pajpach

  • 0
    TI__Intellectual 2900 points
    Hello, Miroslav!

    Here are my comments on your 3 questions. please feel free to let us know if you have any other concerns.

    1. We have not validated this device in high altitude scenario such as aircraft. If you can help us understand some key care-abouts in your application, for example, at what altitude, you would care which electrical parameters. Our team can analyze if TIC12400-Q1 is a good fit for your design.

    2. There is no issue in such case.

    3. I wouldn't be concerned about the derating, but 27V long-term DC stress on power supply pin is not recommended. The power supply pin is okay with transient cranking event, but it is not able to tolerate long-term 27V DC. Is it not 12V or 18V in your system?
  • 0 in reply to Fan.Wang
    Prodigy 55 points
    Hello Fan,

    Thank you for answers, here are more info about our application:

    1 The device will be inside the aircraft, but outside temperature and pressure controlled area. Maximal operating altitude is 50 000ft (15 200m), pressure in this altitude is about 11.7kPa. Dose rate is about 250 μRad/hr (but device will be under cover, not outside). The device will not be all the time in this environment, this is the worst case for short period (few hours max.). It is assumed flight altitude between 9 to 15 kilometers, maximal continous flight lenght about 10 hours. Nominal inputs voltage will be 27V, absolute maximum 34V. On inputs is assumed wetting current with auto-scaling. not all inputs at the same time will be shorted, and only 6 inputs can be switched continously. All other inputs are connected to tactile switch (button). All inputs will be ON/OFF state, not resistor coded switches.

    2. Fully answered, thanks.

    3. It is possible use lower voltage. We can use 16V or 10V. I think, better is 16V. Is it right?

    Best regards
    Miroslav
  • 0 in reply to Miroslav Pajpach
    TI__Intellectual 2900 points
    Hi Miroslav,

    Thanks for all the details. 16V or 10V, even long term DC stress on INx pin, is perfectly fine.

    Would you share some chips you have used for this type of environment? I am not quite concerned about the electrical derating. I am concerned if there is any special process in the package materials to handle the dose rate requirements.