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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