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TPS7A49: NR/SS voltage below specified

Part Number: TPS7A49

Hello,

One of TPS7A4901DGNR have about half (0.6V) of required bandgap voltage reference level (1.2V). Is it manufacturing defect or can come from design flaws. I use another 2 similar parts for producing 5V and 2V5, while broken was for 17V5. I assume it was broken because after resoldering it with the same new IC, the problem is eliminated.

Regards,