flash memory burn-in processing versus normal processing

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cgchas

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I bought 4 29F010 128K flash memory chips, but I noticed when they arrived, 3 were 29F010B and 1 was 29F010. According to the datasheet for the AM29F010, the B means "burn-in processing" and the absense of a B means "normal processing", but no further details are given.

Can anybody explain the difference to me please?
 

I found

Apparently the burn-in means that the device has been tested in the factory.

Alex
 

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