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LM2904: difference of thermal resistance between datasheet rev. U and rev. V

Part Number: LM2904
Other Parts Discussed in Thread: , LM358B

Dear Specialists,

My customer is considering LM2904 and has a question.

I would be grateful if you could advise.

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I 'm confirming thermal resistance of LM2904.

There're some differences between REV. U and REV. 

Could you please let me know why does these difference occured.

Did the measurement conditions change?

REV.U

REV. V

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I appreciate your great help in advance.

Best regards,

Shinichi

  • Hi Shinichi-san,

    Looking at the document change history, it appears that lots has changed with respect to the thermal information for the latest revision of the datasheet. These changes are never made lightly, so the new version is certainly the correct information.

    I'll need to look into this a little deeper to get more specific information, please allow me a couple days to do so.

    Thank you,
    Paul
  • Shinichi-san,

    Some of the difference is newer thermal model formulas that incorporate more parameters; meaning they are more accurate. The other factor is the increased number of parts in the table header. The table should reflect the highest value of the group. There was no change to the product characteristics for this data sheet update. New products were added in this data sheet release. LM358B and LM2904B devices.
  • Hi Paul,

    Thank you for your reply.

    Could you please let me know if you can obtain detailed information.

    I appreciate your great help.

    Best regards,

    Shinichi

  • Hi Ron,

    Thank you for your reply.

    I understand thermal formula has updated and new devices have added to the datasheet.

    Regarding the measurement of the thermal resistance value, is the same standard(JEDEC) used and the board used for the measurement (High-K or Low-K)?

    I appreciate your great help.

    Best regards,
    Shinichi
  • Shinichi,

    The model used is JEDEC standard and High-K is used.

    More information about thermal

  • Hi Ron,

    Thank you for your reply.

    I'll share this information with the customer.

    I appreciate your great help.

    Best regards,

    Shinichi