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To: Bill Jackson who wrote (76616)	4/7/2002 1:28:40 AM
From: TGPTNDR	Read Replies (2) \| Respond to of 275872

Bill, Re: <you eventually reach a point where the temperature at the junction needs to be limited to prevent junction degradation by thermally accelerated diffusion of point dopants away from their area of influence and this leads to a transistor that deviates from what it should be> I would guess the junction temperatures to be hundreds of degrees higher than the average die temperature. Especially in 'loosely constructed' chips like the P4. tgptndr

To: Bill Jackson who wrote (76616)	4/7/2002 1:42:11 AM
From: tcmay	Read Replies (1) \| Respond to of 275872

" I was told that one of the life limits in the operating temperature of semiconductors was the junction temperature." Yeah, so? PN junctions (look them up) leak at very high temperatures. This has _nothing_ to do with the diffusion of dopant atoms in the crystal lattice at a thousand degrees higher temperature! Junction leakage, and general I-V characteristics play hob with running some logic at 150 C...but diffusion of dopant atoms is not the issue. "Most items in the past were rated at a temp that puts their lifetime at 1,000,000 hours or more. However as features get smaller, but atoms do not, you eventually reach a point where the temperature at the junction needs to be limited to prevent junction degradation by thermally accelerated diffusion of point dopants away from their area of influence and this leads to a transistor that deviates from what it should be...like it's buddies." You're just repeating what I showed you was false in my last post. --Tim May