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TL16C752B-EP: TL16C752BLPTREP

Alain Mozerski
Prodigy 100 points
Part Number: TL16C752B-EP


Hi team,

about EP grade limited to 110°C max ambient:

RTHJA is 61°C/W, Tj max 150°C.

Delta T(J-A) =  worst case 61°C/W * 0.020A* 3.3V =  4°C increase max => Tj max 129°C @ Ta 125°C => lower than 150°C Tj max.

Can this part be available/specified in TA 125°C? or are there others limitations?

Thanks

Regards

  • 0
    TI__Genius 14540 points

    Hi,

    The apps engineer supporting this device returns to the office on Tuesday at which time he will respond to your questions.

    Thanks.

  • 0 in reply to Christian Yots
    TI__Guru 62930 points

    Alain,

    There are a couple of minor issues with your assessment.

    1) First off, theta Ja is not a very good metric.  It is the least accurate of any of the thermal metrics due to extreme amount of variability.  If case or board temp can be constrained, then one of these metrics would be much better predictor of junction temperature.

    2) 150 Tj max is the absolute maximum specification.  It does not warrant operation to specification, only that device will not be significantly stressed.

    3) The junction temp must be 125c or less to warrant operation to datasheet.

    4) The icc value quoted is a typical, and not a max value.   Unfortunately, a max value is not available.  It would be wise to use at least a 20% adder to help insure within design goals.

    5) The dissipation value does not include any IO loading.  This will add to the power dissipation required.

    Another limitation, is the wirebond life.  At 110 Ta, this device meets TI design guidelines and the wirebond life chart is not included in the datasheet.

    At continuous Ta of 125c, it is estimated that the wirebond life would be around 5years, and this would not meet TI design rules.

    The newer enhanced thermal metrics are not in the EP datasheet.  However, I have included them here and made note to have them updated in next datasheet release.

    Here are the correct thermal metrics:

    Theta JA-High K 61.0
    Theta JC, top 19.3
    Theta JB 26.6
    Psi JT 1.0
    Psi JB 26.3

    If the Tj can be constrained to under 125c, then device operation will be within recommended operating conditions.  This also assumes that the operating life will be reduced based on Ta exceeding 110.

    If this answers your question, please click "This Resolved My Issue"
    Regards,
    Wade