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LM2903: LM2903DR

Part Number: LM2903

the compartor was fail in parameter Input offset voltage insted 2.5mV we got 13mV only in one compartor .
do you know the reson of the failure of the compartor in Input offset voltage?
do you have history of failure in this parameter?

a maximum input offset voltage 7mV (at 25º )

Test condition  (5V vcc - vee=0v) TA= 25º

We use  SMU (source measure unit)