• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 47 subscribers
  • Views 1293 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DAC8571 Absolute maximum rating of "Lead temperature, soldering"

masahiko shimizu
Guru 11235 points

Hi,

My customer has a question about absolute maximum rating of "Lead temperature, soldering".
Could you let me know the mean of red circle description below, please?

I thought that Vapor phase (60s) is max time at time maintained above.

But I got temperature profile below, and I think my idea is incorrect.
Please answer me above question.

=========================================
Preheat　 　 ： 150～200°C (60～120s)
Time maintained above ： 217°C (60～150s)
Peak temperature ：　260°C
Time within 5 °C of actual peak temperature : Up to 30s
Average rump-up rate ：　Max 3°C /s
Average rump-down rate ： Max 6°C /s
=========================================

Best regards,
Shimizu

  • 0
    TI__Mastermind 46290 points

    Hello,

    masahiko shimizu said:
    =========================================
    Preheat　 　 ： 150～200°C (60～120s)
    Time maintained above ： 217°C (60～150s)
    Peak temperature ：　260°C
    Time within 5 °C of actual peak temperature : Up to 30s
    Average rump-up rate ：　Max 3°C /s
    Average rump-down rate ： Max 6°C /s
    =========================================

    It is my understanding that this specification comes from IPC-JEDEC J-STD-020E and is intended to be applied to convection reflow soldering which differs from vapor phase soldering. Therefore if you were to use this profile for convection reflow soldering of the device there should not be any issue, but the datasheet is advising that for vapor phase soldering the device is not exposed to >=215C for >60 seconds.

  • 0 in reply to Kevin Duke
    Guru 11235 points
    Hi Kevin,

    Thank you for your reply.

    But this datasheet description is wrote as absolute maximum rating, It is not "Advice".
    And It is value which must be follow by customer as guarantee rule.

    If this datasheet information is "Advice", TI must delete this description from "Absolute maximum ratings" of datasheet.　

    Could you delete this information about soldering from datasheet, please?

    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    TI__Mastermind 46290 points
    Perhaps "advising" was poor word choice - it is an absolute maximum rating for vapor phase soldering. It should not be violated. It will not be removed from the datasheet unless we conduct an investigation that yield sufficient evidence that the device could indeed survive longer in vapor phase soldering.

    As I said, as far as I understand this is different from typical convection reflow soldering which corresponds to the profile in your original post.