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To: VinWood who wrote (51940)4/2/1998 3:46:00 PM
From: Jeff Fox  Read Replies (1) | Respond to of 186894
 
Vin, re: Burn in

lot should be rejected in its entirety for a certain percentage of failures

Yeah - that too. Sample burn in is a part quality control of even healthy processes. 100% burn in is required for new or sick lines. The choice is purely a matter of statistics given the quality level that the policy and quality goals of the manufacturer. Sorry - whether sample by lot or 100%, it sure sounds like screening to me. If you like another word feel free to use it.

In fact Nat Semi has been fined several times in the past,once that I am intimately familiar with for $6 mil., for falsifying burn-in data.

I read that Fairchild also did this. Look where it has gotten them. National bought the remains of Fairchild. The combination isn't exactly the industry leader, right?

I know another company that is the industry leader that religiously uses both 100% burn in on new processes, then sample burn in after the process is proven to meet quality requirements. This company has never cheated. In fact it produces this data for its own use without external prodding as it really wants to know its own quality level in order to perfect its factories.

As for its customers, they allow Intel to ship "dock-to-stock" as they are assured of high quality.

Jeff