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REF3430: Temperature characteristic

Genius 12850 points
Part Number: REF3430


I have a question about REF3430 temperature drift characteristic.

From figure 3: “Output voltage Accuracy vs Temperature” in the datasheet(SBAS804B),
although there are small ups and downs actually, the accuracy % tends to increase as the temperature increase as a whole.
I mean the linear regression line of it looks like having positive slope like the red line I added in the below figure 3.


Can this tendency be applied to all REF3430 devices?
Or it is just typical characteristic and we don’t know whether all devices have such a tendency?