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LM2936HVMAX50NPB

Dear Forum members

This is Monica from BANDO SEMICOM in S.KOREA.

I bought the part name -LM2936HVMAX50NPB  from MOUSER ELECRONICS.

John Cummings helped me to contact Korea TI Sales team and they checked Lot number and history. Korea TI said 'The Lot code has no failure history from field and production.'

My customer said 'If there is no problem with Lot code, it seems storage system problem. Since I bought from another agency it works well' I also asked MOUSER to check this problem, but they only repeat 'the customer need to check TI USA directly even if storage condition. MOUSER argued they made contract with TI USA, so check with TI USA not Korea TI. 

I have the failed units for failure analysis.  I have total 500pcs including used 5pcs. Could you please let me know failed unit instruction to solve this problem. 

I’m waiting your reply.
Thank you in advance for helping me.