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LM385M3-2.5

Hi,

I am currently using LM385M3-2.5 SOT-23 diode voltage reference from National Semiconductor (specified by our customer as - "no substitutions allowed") on one of our products.

Today I received the parts with TI body marking.

I thought our supplier has purchased the wrong part but I just discover today that TI has acquired National Semiconductor quite sometimes ago.

My questions:

a) Do you have any official documentations to show when the TI marking starts to replace the National Semi marking on the part or any other proof that I can use to let my customer know of the changes? 

Thank you.

Best regards

Fikri