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AM26LS31: junction Temp and Storage Temp

user5163865
Genius 3800 points
Part Number: AM26LS31
Other Parts Discussed in Thread: AM26C31

Tool/software:

Hi,

Our customer is changing from AM26LS31 to AM26C31, so we received some inquiries from them about thermal design.
T think Q1) is a strange question, but if you know, please let me know.

Q1) According to other threads on E2E, for AM26LS31, storage temperature and junction temperature are different.
    On the other hand, for AM26C31, both are 150℃ max. Why is C31 the same value?

Q2) AM26LS31 current consumption is 80mA max, but is there any information on the change in current consumption with temperature?
    If there is a graph of current consumption vs. temperature, please provide it.


*I tried to search for general materials about Q1), but the storage temperature and junction temperature are completely different, so I don't think there is a causal relationship.

However, it seems that in many products, both values ​​are 150℃. Are these specs tested?

I think the junction temperature is probably tested, but is the storage temperature determined by the package, etc.?


Thank you very much for your help.


Best regards,
Hiroshi

  • 0
    Guru 295630 points

    1. When in storage, there is no power dissipation inside the chip, so all parts of the chip are at the same temperature. Therefore, the storage and junction limits are the same.

    2. The LS31 is an old device; that information probably is not known. Anyway, the power consumption of the C31 is much lower.

  • 0
    TI__Guru 62610 points
    user5163865 said:
    Q1) According to other threads on E2E, for AM26LS31, storage temperature and junction temperature are different.
        On the other hand, for AM26C31, both are 150℃ max. Why is C31 the same value?

    Not all devices will have the same max junction as the max storage however max junction should not ever exceed max storage. 

    user5163865 said:
    Q2) AM26LS31 current consumption is 80mA max, but is there any information on the change in current consumption with temperature?
        If there is a graph of current consumption vs. temperature, please provide it.

    As Clemen's pointed out, this isn't something we have.

    user5163865 said:
    However, it seems that in many products, both values ​​are 150℃. Are these specs tested?

    Absolute max junction temperature isn't a tested value. It relates to the device's design and process technology. Usually it's the max storage temperature but it's not always the case. 

    user5163865 said:
    I think the junction temperature is probably tested, but is the storage temperature determined by the package, etc.?

    Storage temperature is related to the packaging as you suggested. Only recommended max junction temperature is tested if it's called out in the datasheet, absolute max junction is not tested specifically. 

    -Bobby

  • 0 in reply to BOBBY
    Genius 3800 points

    Hi all,

    Thank you for the detail.
     I will try to explain it to our customer.

    Best regards,
    Hiroshi.