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Low temperature boundry

Karsten Hansen
Prodigy 50 points
Other Parts Discussed in Thread: LMH6642

Normal temperature range for an op-amp goes down to -40degC, including the LMH6642 in an SOT-23 house, which I would like to use in a new application.

Can anyone explain which parameters - electrical or mechanical - are deteriorated if the component is used below this boundry? Will it affect the life time of the component ? 

It is easy to understand what happens at the upper limit (I guess we have all seen smoking components or other sudden malfunctions at high temp.), but at low temeratures it is more unclear, at least to me.

Thanks in advance.   

  • 0
    TI__Mastermind 22825 points

    Hi Karsten,

    We at the factory "characterize" the part only over its operating ratings (-40C to 85C for the LMH6642). There will not be any damage to operating the part below -40C (down to -65C where the Storage temperature limit is).

    If you are willing to accept that there are no operational spec "guarantees" below -40C and there could be lot-to-lot performance variations, and you've tested a number of units to make sure they do what you are intending to do, you can use the part this way.

    Regards,

    Hooman

  • 0 in reply to Hooman Hashemi
    Prodigy 50 points
    Thanks, Hooman, for your answer.

    Do I understand it correctly, that it is more a question of TI not having tested the component below -40degC and therefore you are not taking any responsibility for the components behaviour at this range.

    But apart from maybe not fulfilling all specified requirements and possible lot to lot deviations you see no problems like reduced life time by using it below -40degC ?

    Best regards
    Karsten
  • 0 in reply to Karsten Hansen
    TI__Mastermind 22825 points
    Hi Karsten,
    Your understanding is correct.

    There will not be any reliability issues as long as you don't subject the device to less than -65C (storage temperature limit).

    Regards,
    Hooman