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PCM4104: Junction temperature range

Wiky Liao
Intellectual 1550 points
Part Number: PCM4104

Hi Team,

May I know the maximum junction temperature range of PCM4104? We find surface temperature will up to 82C, while datasheet only shows the operating range is -10~70C, need your help to confirm the maximum junction range for us, thanks.

Best regards.

Wiky

  • 0
    TI__Genius 14220 points

    Hi Wiky,

    My colleague Paul will respond to this in the US timezone.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC

  • 0 in reply to Uttam Sahu
    TI__Guru 52663 points

    Hi Wiky,

    Is there some kind of significant load on the device or short? The abs. max table shows the upper limit of 70°C, so the configuration you are using could potentially damage the device.  Can you share a schematic?

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Prodigy 190 points

    Hi Paul,

    Datasheet writes"SPECIFIED TEMERATURE RANGE -10 to +70C" we want to know what king of temperature it indicates for? case temperature? or PCBA(environmental) temperature? or air temperature?

    All PCM4104's parameters on my project are meet datasheet, but IC's surface temperature over 85C due to amplifiers heating;

    It maybe a problem? any suggestions?

    Thanks!

    Hawley.

  • 0 in reply to user4935639
    TI__Guru 52663 points

    Hi Hawley,

    The temperature specification should be considered as a TA (temperature-ambient) limit.  The device was only tested and characterized at an ambient maximum of 70°C, which was common for personal electronics limits at the time.  We do not have additional data to verify what performance or device lifetime will be when the absolute max table is being violated.

    I think it is worth noting that while the device package does act as a thermal insulator, given enough time the device die (TJ = temperature-junction) will be higher than TA. .

    Is it possible to improve the thermal dissipation of the amps to reduce heating?

    Thanks,

    Paul

  • 0 in reply to Paul_Frost
    Prodigy 190 points

    Hi Paul,

    It is not possible to improve thermal dissipation on this project.

    For most commercial part, normally defines working temperature is 0~85°C.

    Problem is how/hard to define "TA (temperature-ambient)"? 

    In our case, the air temperature inside the enclose is ~60°C, so it is OK to meet PCM4104's spec. but temperature of the PCB near PCM4104 is ~76°C, we are doubt if it is really OK?

    Are you meaning PCM4104 is only tested and characterized at an ambient maximum of 70°C on a board without other heating sourcing? so we must keep PCBA temperature below 70°C.

    Thanks!

    Hawley.