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DAC5672: Tjmax

Masanori Tachibana
Genius 5350 points
Part Number: DAC5672
Other Parts Discussed in Thread: , DAC5681

Hello support team,

I want to know the maximum junction temperature (Tjmax) of DAC5672.
It is not seen in the datasheet.
I'd appreciate your informing me.

Best regards,
M. Tachibana

  • 0
    TI__Guru* 91947 points

    Masanori,

    We are looking into this.

    Regards,

    Jim

  • 0 in reply to jim s
    TI__Mastermind 20541 points

    Hi Masanori,

    Please use DAC5672A datasheet which has the thermal information. http://www.ti.com/lit/ds/symlink/dac5672a.pdf page 6 and there is a foot note (1) with a link which will help you with the calculations.

    DAC5672 and DAC5672A are basically the same device, same package, same pinout. If this is for a new design I would recommend to DAC5672A over DAC5672.

    Regards,

    Neeraj

  • 0 in reply to Neeraj Gill
    Genius 5350 points
    Hello Neeraj-san,

    Thank you for reply.

    I compared the datasheets of DAC5672 and DAC 5672A.
    The thermal information described in them seem to be same.
    In order to obtain the maximum junction temperature, I think that it can not be calculated without information on the maximum power dissipation "Pd".
    However, the datasheets of DAC5672 and DAC5672A don't contain the description of Pd.

    I want to know how high the maximum allowable junction temperature of DAC5672 (or DAC5672A) is.
    For example, such as 150 °C for DAC5670 (mentioned in page 6 of datasheet) or 125 ° C for DAC5681 (page 5 of datasheet).

    Best regards,
    M. Tachibana
  • 0 in reply to Masanori Tachibana
    TI__Mastermind 20541 points
    Hi M. Tachibana,

    Page 5 of the datasheet give to device power consumption under section 6.8 recommended conditions. Lets use the max number 3.6V for both analog and digital supply. Max Iavdd = 90mA and max Idvdd = 38mA. Total power consumption = 3.6V*(0.09+0.038) = 0.4608W. Please use this to calculate the junction temperature.

    Regards,
    Neeraj
  • 0 in reply to Neeraj Gill
    Genius 5350 points

    Hello Neeraj-san,

    Thank you for the information.

    Since the power consumption is 0.4608 W and the thermal resistance RθJA is 64.4 °C, / W, the junction temperature is calculated as 85 + 0.4608 × 64.4 = 114.68 °C　in case the ambient temperature is 85 °C.

    Is this junction temperature value (114.68 °C) absolute maximum rating?
    Is there any possibility for decreasing the product reliability such as failure or destruction, if the junction temperature exceeds 114.68 °C?

    I want to know the maximum junction temperature "Tjmax as absolute maximum rating".
    Please refer the description in below material.
     http://www.ti.com/lit/an/spra953c/spra953c.pdf
      Page 12
      Section 7 Miscellaneous Definitions
      Absolute Maximum Junction Temperature

    Best regards,
    M. Tachibana

  • 0 in reply to Masanori Tachibana
    Genius 5350 points

    Hello support team,

    After that, there was no reply from anyone.
    How is the situation?

    Best regards,
    M. Tachibana

  • 0 in reply to Masanori Tachibana
    Genius 5350 points

    Hello support team,

    Again I will ask you the same question.

    What is the maximum junction temperature (Tjmax) of DAC5672?
    Is it 125 °C?
    Is it 150 °C?
    Is it any other temperature?

    Since it is unknown, the customer can not design thermal designs and he is troubled.

    Best regards,
    M. Tachibana

  • 0 in reply to Masanori Tachibana
    TI__Mastermind 20541 points
    Hi M. Tachibana,

    The max recommended junction temperature is 105 °C. I have contacted design team give me more info for the absolute max junction temperature.

    Regards,
    Neeraj
  • 0 in reply to Neeraj Gill
    Genius 5350 points

    Hello Neeraj-san,

    I understood that TJmax is 105 °C.
    Thank you for your trouble.
    I'll pass the information to the customer.

    Best regards,
    M. Tachibana