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Texas Instruments OPA2188: There is Long-term stability in the OFFSET VOLTAGE item, but how should I interpret it?

amplifier/linear

After operating for 1000 hours at 125°C, the offset fluctuates by ±4uV (typ).

Assuming the initial offset voltage Vos=5uV, it will change by ±4uv (typ) after 1000 hours of operation at +125°C.
As a result, Vos can be 1uV or 9uV.

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