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UCD9081: junction temp

Part Number: UCD9081

Team,

 

My customer has the following question. 

 

"Could you help me by providing additional information on the temperature rating on the UCD9081? It is rated with an Operating free-air temperature Spec of 85C with no maximum junction temperature specified on the datasheet. I would guess it has a recommended max junction specification of 125C, but I wanted to verify with you."

 

Regards,

Aaron

  • Genius 10930 points

    Hi Aaron

    We are checking this and will update you soon.

    Thanks

    Yihe

    PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question.  Thanks!

  • Genius 10930 points

    In reply to yihe:

    Hi Aaron

    The inital resposne i got is that the Junction temp does not vary widely from the free-air temperature sine the device is very low poer and does not genertate much.

    heat. so i would think 125C is too high.

    Regards

    Yihe

    PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question.  Thanks!

  • In reply to yihe:

    Yihe,


    Would 105C be OK?    


    Regards,

    Aaron

  • Genius 10930 points

    In reply to Aaron Spaete:

    they recommend 85C to match free air temperature. Is this a big concern for your customer?
    thanks
    yihe

    PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question.  Thanks!

  • In reply to yihe:

    Yihe,

    The ambient T in many cases can be 85C.  If that is the case, there is no way the Tj can stay at 85C as well.  I would expect it to be hotter.   Ideally we would be at 105C.  Yes, this is an issue.

    Regards,

    Aaron

  • Genius 10930 points

    In reply to Aaron Spaete:

    Yes, the junction temperature is extremely close to the free air temperature due to the very low power consumption of 9081.Will they consider UCD9090A which has much high temp rating.
    Thanks
    Yihe

    PS: Please mark this post as answered via the Verify Answer button below if you think it answers your question.  Thanks!