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To: Petz who wrote (7339)	9/1/2000 9:07:24 PM
From: Bill Jackson	Read Replies (1) \| Respond to of 275872

John, Copper fins are better than aluminum fins . The best heat sink is a continuous machined copper finned device. Look at the high speed ECL chips with their little copper finned hats. Aluminum is not as good. Going from cooper to aluminum introduces a junction that has an oxide layer in the heat path, which is not good. The copper spreaders that are bonded to an aluminum piece with fins will not be as good as the same thing made of copper in toto. The copper spreader is costly and the aluminum is a lot cheaper. So when they use a spreader it is to take the small die hot spot and spread it out to a 2" square area and then send it into the aluminum and into the fins using a cheaper material. Copper costs 5-6 times as much as aluminum per cubic inch since pure copper costs ~1.5 times aluminum per pound and it is ~3 times as dense =~4.5 times the cost. Diamond is the very best, though. Bill