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Hi Su Yi,
I'll get you in contact with our quality control department.
Hi Su yi,
I am the senior quality engineer responsible for this product. Tom has roped me in to this discussion. We would be happy to look into this to determine if we have any systemic issues with lead plating and/or solderability on this product. Kindly use the link below to submit a request for a quality investigation. Once request is entered, you will be provided follow up information on how and where to ship the unit for the TI investigation.
https://www.ti.com/productreturns/docs/createReturn.tsp
Best regards