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DCR010505: Junction Temperature of DCR010505

Voyager Liao
Prodigy 170 points
Part Number: DCR010505

Hi TI Sirs,

I would like to know what is the junction temperature limit of DCR010505U

I only find "Ta" (-40C ~ +85 C) in the datasheet

In my application(IPC), the measured case temperature of DCR010505U is 84.8C

Which is very close to the +85C limit.

So I would like to know the junction temperature limit, to ensure the stability of my application.

Thank you very much. 

  • 0
    TI__Expert 8130 points

    Hi Voyager,

    From the information you provided, the device should behave properly. The 84.8 C measurement you provided is case temperature which is sure to be higher than the ambient temperature.
    Operating below the maximum ambient temperature ensures that the maximum junction temperature of any component inside the module is never exceeded.

    Regards,
    Alejandro

  • 0 in reply to iAlejandro
    Prodigy 170 points

    Hi Alejandro

    Thanks for your reply.

    And sorry for my information incomplete.

    In my company (Delta Electronic.), we need to consider the de-rating spec (5C)

    Which means the case temp. over 4.8C in my application. (85C - 5C = 80C)

    So I still need to know what is the junction temperature limit of DCR010505.

    Thank you very much.

  • 0 in reply to Voyager Liao
    TI__Expert 8130 points

    Hi Voyager,

    No problem. I understand your concern.
    Unfortunately, I cannot fulfill your request due to these devices are part t of our legacy modules of +10 years old in which we do not have the data for.

    But, I can assure that the module will be stable due to the information you have provided.
    The ambient temperature is the air temperature of the surrounding environment. The junction temperature is the temperature of the internal power IC when the device is powered on. The junction temperature is going to be higher temperature than ambient. Therefore, as long as the device is within operating ambient temperature there should be no problems.

    Thanks,
    Alejandro

  • 0 in reply to iAlejandro
    Prodigy 170 points

    Hi Alejandro

    OK, I got it.

    However, my company can't accept the failure on the de-rating spec.

    Besides, the margin of 84.8C ( only 0.2C) is also too small.

    There is greaet opportunity in my application which the temperature might over 85C.

    For the below 2 question...

    1.TI don't guaranty the chip quality if the case temperature over 85C, right?

    2.Do you have other suggestions of regulated power module which have higher temperature range?

    Thank you very much.

  • 0 in reply to Voyager Liao
    TI__Expert 8130 points

    Voyager,

    I believe we are having a bit of a misunderstanding between the term 'case' and 'ambient' temperature. Let's start by ensuring we are looking at the same item.
    On your first post you mentioned, "the measured case temperature of DCR010505U is 84.4C". So, from my understanding, the info you provided is the temp reading you took by measuring the top of the device (case), correct?

    In response to your questions:

    1. TI guarantees chip quality if the ambient temperature is in range of -40C to 85C since we do not have info on 'case' temperature due to it being part of our legacy devices. Therefore, as long as you remain within operating ambient temperature you should be okay.
    2. I can suggest other power modules (of course, assuming for isolated), but first I would need information about your application. What are your requirements? Vin, Vout, Iout? Ambient Temperature?

    Regards,
    Alejandro